289 with gt40p heads hp. Work better than these 87 smog piped 302 heads.

289 with gt40p heads hp Save your 289 heads for later. With the Windsor heads you need special head bolt washers/spacers that center the head bolts in the bolt hole on the 351W heads and I think you need to use Windsor intake gaskets. Total timing is about 31 degrees (GT40p heads don't need as much advance as the old 289 heads (or even the E7TE heads). Weiand Stealth intake, port matched to heads Gt40"P" heads shooting for 10:1 Sep 3, 2020 · Tracy Blackford, 65 Mustang FB, 331 built with 289 H beam rods and 383W piston, 282S cam, ported Promaxx 180 heads, Dougs Tri-Y headers. Mustangs Plus has the hipo manifolds on sale for $250, and I'm tempted. If you are looking to upgrade i suggest looking for a set of E7TE heads from a 1987 to 95 mustng 5. 540” Exhaust Valves Mar 18, 2019 · Nothing wrong with a 289. It helps that we jet hot coated them as well. Maybe 85% at best, and that's optimistic. Good driveability manners. I can't rattle off the exact sizes off the top of my headalthough I want to say the difference is only one or two sixteenths of an inch. You'll need new springs for any lift over . I plan on using these heads on my 289 for a mild build say around 280-300 hp and wonder if bigger valves would be worth it or not. 060 they were good. Jul 17, 2012 · Pretty much all 289 heads, except for the C3 HiPo heads, have 54. Here is my question. Oct 3, 2009 · Probe Racing forged and balanced 347 stroker, AFR 185's, Comp XFI stroker cam . Work better than these 87 smog piped 302 heads. May 13, 2018 · Wouldn't be very hard. A 10 CC difference is about a full point on a 289. In other words, nothing special. If you aren't going to cam the engine, 100% don't bother with the heads. 030" overbore) on stock rods with ARP fasteners, Silv-O-Lite 3101HC pistons (1. Jan 11, 2012 · After carbs, headers, intake, cam they didn't see much more than 25 more hp. not for the GT40P heads. Anybody have experience with this particular mod? Do I need different push rods, what are some good cams for a Feb 24, 2013 · I changed my E7 heads to GT40P heads, along with 1. it seems it isn't as easy to get around a 9. Most heads are geared for about a 9:1 on a 302/5. Save Share Jul 15, 2020 · 289 / 4100 / C4 / 2. GT40P's run from 59-61cc. 1. Feb 15, 2010 · you'll need special stepped head bolts. Alternative is the Performer manifold and 4160 Holley I'm currently running. The original 68 289 heads were probably the worst heads ever used for a performance standpoint. A cam is much easier and cheaper to change than heads, so I don't know why you'd be averse to doing thaa cam. Feb 18, 2009 · The standard 4v 289 was factory rated at 225 hp and the hipo was 271 with torque at 300/310 . 3. 0 heads which are the venerable GT40p’s. Jul 27, 2010 · There's guys on Corral. Cheapest would be something like 351W Heads or GT40/GT40P heads, a mild cam, Edelbrock Performer RPM intake, 600CFM carb, and some Tri-Ys. 99. I know the spark plug angle is an issue with headers. The stock 289 heads are fine for what they are. 500". Oct 22, 2002 · They have some casting marks. 7/1. 0's. Beware your compression is going into the dumper. If you do put on the 40P heads, with your static compression being low, that will really prevent you from wanting to put in a performance cam. Dec 19, 2007 · I got these heads from a SS racer who ran 289's all the time and ran high RPM's to make the HP. Oct 31, 2004 · I just installed a set of gt40p heads, e303 cam, 1. Sure there are better aftermarket heads that flow better. one of the hotrod magazines did an article on the combo back in the 70's. 030" with good forged pistons, balance, install a set of GT40 Y303 heads, Weiand Stealth intake manifold, Tri-Y headers, Comp Cams 265-DEH camshaft (. be a good price for 289/289hipo and gt40/gt40p Sep 17, 2020 · gt40p 351w wont crack 300 hp on a good day. 0/302, 5. 25" dual exhaust. That's a full point loss. I had a 85, 5. I use a stock 302 electronic didstributor with the advance modified to give full advance by 3,000 RPM with an Accel 3000+ box with built-in rev limiter and Accel coil and matching wires. May 28, 2004 · E6 heads will not allow enough flow to produce 300 hp N/A. With 700 plus hp engines coming from the factory these days, 300 horsepower doesn’t sound like much, but in a Foxbody or SN95 Mustang it’s the perfect combo of streetability and reliability. The time and money it would cost to get 370rwhp out of them would be much better spent on buying a complete engine with Apr 27, 2008 · The heads with 65 cast in them are just 1965 cylinder heads. Here's my basic motor set up so far: Edy 1405 600 cfm carb. Stock heads on a 289 are 55cc. 1989 GT - Show Car Project Mods: AFR165 - Comp XE264-12 cam, WC T5Z, Tmoss Cobra Intake, full bolt-ons, 305 rwhp / 345 rwtq:racer: Jul 30, 2011 · Here I am again needing help :( OK so here is my situation I recently picked up some freshly rebuilt GT40 (NOT GT40P) heads with a ARP head bolt kit and 2 new Fel Pro head gaskets for a cool 200$ :) I was hoping I can install them on my 289 engine. May 23, 2013 · GT40 heads NY Brit, it won't add any power. Mar 14, 2024 · The good news is that a Ford 302 300 hp build is very easily achievable with a junkyard 302 build and a few choice upgrades. 0L that was equipped with a set of really decent GT40P style iron heads. 270HR. 7 shaft rockers and beehives. C code 289's have a dished piston that displace 13 CC's. Even late model GT40 or GT40P heads would be a big Nov 4, 2018 · The inexpensive alloy heads often need as much work as junkyard heads, and the difference of free GT40P heads vs buying others and still paying for work on top of that makes it a reasonable deal. Nov 20, 2008 · Dude, why would you even consider heads from a 289. Use Ford Performance Head Gasket M-6051-CP331 or M-6051-S331 or for "Big Bore" application, use M-6051-R351 Must use Ford Performance M-6065-D289 Head Bolt Kit to install heads on 289/302 production blocks Ford Performance "X2" heads use either GT-40 or aftermarket intake manifolds. 478 lift-Performer RPM intake-Holly 600 vaccum assist-headers(dont have yet but will need for the gt40p heads)-9. Obviously heads from a 289 will be smaller in terms of Port size. ford made change in the middle 64 prodution, the 5 bolt belhousing paturn . Jan 24, 2019 · Ported Hurricane Single Plane and custom 750 HP. 84", 1. The P heads should be able to well keep up with the lessened cubic inches. 1 Supercharger dynoed at 12psi: makes 412whp/424wtq on E85: 300K miles on stock engine Aug 27, 2019 · The 302 got special 1 year only J code heads. The specs are: Stock Block Ported gt40p heads Manley stainless valves, with gt40 larger exhaust valves Double valve springs matched to cam Hardened pushrods measured to length Scorpion 1. They flow much better than hipo 289 heads, which flow exactly the same as standard 289 heads. the engine- untoched gt-40p heads explorer intake shorty headers compresion ratio is what ever a stock 98 explorer engine is (9. LSG May 9, 2017 · I will use my Autolite 600 CFM carb. What really did it (after the other parts) was the heads. Just reading threads I was thinking the gt40p heads would be a good upgrade but I see other heads cheaper but have no ideal if they would be good. My 289 with Canfield 195's did hit 400 hp by 6,000 rpm on a DTS PM Apr 27, 2013 · GT40P heads peak for TQ at 3300 and 90%, and HP at about 78% VE stock at about 4200 RPM and drops fast from there. 89 9" TL rear. roller tip roller rockers. 004. Like it's been mentioned before, the E7/GT40/GT40P heads use pedestal mount rockers. Apr 11, 2012 · Those mods are basically a bone stock car and Hp number is likely closer to 200 Hp (+/- 10 Hp) in most cases. 90 but still thats pretty damn quick if I can ever finish my motor lol. i knew a guy that put a set on his 65 shelby. T5z and 3. See more info in the head flow section further below. have the intake valves back cut . May 23, 2006 · I have baught these GT40P Heads:Ford GT40P 289/302/ 60cc Combustion Chamber Pedastall Type Rockers Used Positive Oil Control Seals 5 Angle Valve Job Stainless 1 Piece Swirl-Polished Under-Cut Stems 1. You are shooting for about 250RWHP. Folks do well with the P heads with their 302's but in the spirit of this build, I am re-using the crank and rods from my 1967 fastback's 289. I have a 66 coupe with a 289. They could be 289 Hi Po heads which just means that they have push rod slots machined in so that they don't have to use rail style rockers and screw in studs, otherwise, contrary to Internet rumor are no different than other early heads. Jan 29, 2006 · Hot Rod magazine did a build up of a junk yard 351W with the GT40P heads. 0 Mustang was re-rated at 200 HP from 225 HP while the P motor made more then 200 HP and did this with a milder cam and single exhaust! Later model Explorers with the 5. . High 11s like 11. Jan 28, 2007 · is the b cam good for gt-40p heads, also will be using 1. extrude hone and port matched. They have GT40 sized intake but standard 289/302 exhaust valves, but work real well because of the improved efficiency. The GT40P heads are not different then the run of of the mill 302 head. You could end up in the 7’s if you’re not careful. I had something close in the 89GT with some differences and put down 240RWHP through an AOD but the above would do better then mine. GT40Ps flow better up to 0. 0-equipped Explorers. He was also turning around 7800 RPM with that combo. net making 300 RWHP with GT40P heads, stock bottom ends and TFS1 cams. I went with the 3 bar GT40's but there is also the GT40P model heads. Boss block Big bore 347/225 TFS HP's/SR/BW S476R/A2W/PG/FAST Aug 4, 2014 · We show you how to upgrade your Ford GT40P heads with help from Comp Cams, Lunati, Trick Flow Specialties and more. The GT40P head has a chamber of 60 CC and with a small cut put you right at 55 CC. The steeda #18 is supposed to put a n/a Gt40p set up into the 11sec ET. This should put you right about 260+ hp and over 300tq. BTW, I'm overboring by Sep 7, 2016 · GT-40 heads are only marginally better than E5/E7TE heads that came on production 351/5. 54" valve and bigger intake port but going to lose alot of compression if you only change the heads and not the pistons. 6 rockers Anderson N-41 cam 24lb injectors T-moss ported explorer intake Jun 3, 2010 · I will be using Gt40p heads ported and polished and 1. 450" and the only cast iron exhaust manifolds worth a damn are '69-70 351W pieces or reproduction HiPo's. But would a set of 289 heads that have had same size valves as 302 fitted, then ported and scimed. 2. Oct 4, 2002 · Small Block V8 (221, 260, 289, 5. Mar 5, 2011 · Currently I have standard 1968 heads, high rise intake and holly 600 4b carb. It has underdrive pulleys, MSD ignition, Bassanni headers and forward exit exhaust. I know hypos are very good, but very expensive. You won't have to worry about plugging thermactor ports at the rear of the heads either with the "P" heads. Mar 18, 2009 · But was wondering if anyone has put a set of 289 heads on 302. The 289 heads would need a complete porting, valve job, etc Jul 29, 2019 · Hey all, coming here to see if someone has a similar setup. Add a couple-three percent for cleanup, and 3 or 4% for a 5-angle seat job. It's all in the head prep and the right cam. Mar 15, 2005 · My question is, has anyone milled GT40P's? Is it true that a . They installed GT40p heads and got 45 more HP. Mar 23, 2004 · Are GT40 or GT40P heads a bolt on for my '65 289 A-code motor? The plan is to use the original cast iron intake & Autolite carb. Hooker headers w/ 2. Feb 16, 2012 · Small Block V8 (221, 260, 289, 5. you could also Nov 21, 2021 · FORD NKB 190cc/62cc ULTRA HIGH FLOW CYLINDER HEADS, 289 302 347 ENGINES. no 5 hole opened up a tad to equal flow gt-40 heads with larger valves bowls blended chambers radiuses to slightly unshroud the valve ( valves are cutback design from manely) Oct 17, 2023 · Aluminum heads take weight off, as does an aluminum intake. Feb 16, 2004 · Both heads are iron, both heads will bolt on OK (to an early 302 anyway), both heads require late model rockers. And had good results. 0 intake, F303, 80s, 76/65, HP hotside, custom coldside Apr 16, 2002 · I'm investigating the possibility of putting 5. Everyone thinks flat tops are going to give 10:1 or more on a 289. put your other h pipe back on. On a 289 CR is going into the dumper. 72 roller rockers. Feb 9, 2009 · 1) Keep the 289, bore it . cam with cobra roller rockers is a great combo with GT40 heads. 0 GT40P heads on the 289 in my 67 stang. 80:1 / Disc Brakes these headers are designed for the GT40P head in a classic any N/A engine that passes the 1:1 HP/Cubic Inch threshold Mar 18, 2022 · FORD NKB 190cc/62cc ULTRA HIGH FLOW CYLINDER HEADS, 289 302 347 ENGINES. Feb 4, 2014 · This is also 16% more than the highest flowing stock 5. Rune To get 390 HP from a 289, you're going to have to run high compression (11:1 or higher), a solid cam, and some good heads. IDENTIFICATION The GT series heads are easily identified by thin raised lines cast into end of the heads. The engine was then making over 250 hp at the wheels, which is pretty respectable. Sep 15, 2007 · 1. Dec 30, 2014 · One thing to pay attention to is how many CC's do the valve reliefs displace? On 289's, the A code uses a flat top with 4 eyebrows for valve reliefs that displace 3 CC's. GT40's and GT40P's are much better and can be had for $200-$300 complete with stamped rockers. The 68 289 heads had 63 cc chambers. Can I Dec 20, 2012 · Good ignition, too. The GT40 and GT40P heads are a good choice. This is first time that I have heard that the intake ports of the GT40 were different. still want iron heads, go with the late model gt-40 heads. The head bolts were larger in diameter on the GT40 heads than the 289's. Most iron GT40 heads have disappeard from junkyards but you may get lucky. You may have to have the GT40P heads decked some to get compression to where you want it. Not sure of the C/R or cam specs but appears to have a pretty decent cam. you need custom pistons, boss intake, boss heads, boss pushrods, custom headers for a 65-66 mustang, 69-70 b2 headers for 67-70 mustang. A fellow at the local Ford shop says they are compatible and will boost the HP quite a bit. If you have typical C code pistons with a dish, I wouldn't be surprised if you end up in the high 7's. Sent from my iPhone using Jul 13, 2010 · Use 67 289 Hipo cast manifolds, they clear with ease - we are using them right now. 8/351W) - Gt40 heads, worth it or not? - Trying to figure out if a set of gt40 heads would be worth my time or if I should just work over a set of stock heads. There is alot of info out there on different approaches. Apr 25, 2002 · GT-40P heads = 190cfm Most aftermarket aluminum heads (Holley, Edelbrock, etc)= 220-230cfm TFS and AFR 165 = 250cfm Race heads = 260-280cfm Stock intake = 135cfm Explorer intake = 190cfm Cobra/GT40 intake = 200cfm The big flow aftermarket aluminum heads won't give you any hp over the GT40P heads if you don't have the rest of the setup to use them. My concerns are for intake match and valve interference. Jan 24, 2010 · I like the 65 289 heads also. If you're looking for cost effective, this apr or GT40 heads sounds like a good deal. A cheaper way is to build a 331 (bored and stroked 302) and just tell people it's a 289. I got a set of GT40P heads for next to nothing. 605" compression height), AFR165 #1399 (non-emission) heads at 58cc, Edelbrock 7121 (PerformerRPM) intake, Summit 600 carb, Ford M-6250-E303 roller lifter camshaft and Melling F1900RF-16 link bar lifters came in at a calculated 406 hp @ 6,500 rpm. I will be running the HIPO manifolds, weiand alum, intake, electronic ignition, a holley 650, and a 4 speed with 3. Bottom end is stock to my knowledge. With good supporting mods. In my experience you can knock 50 hp off these figures to give real world installed flywheel figures. That's great if you're drag racing and you want to squeeze every ounce of HP out of your SBF. Nov 4, 2002 · Parts I have are 66 289 block, stock crank & rods, rebuild GT40 heads (been decked, guessing 63CC chambers), Edelbrock Performer 289 manifold, Edelbrock 600 CFM carb. Very rebuildable. Here a comparison of different heads on a 302: +30 HP compared to the stock heads. but it might just be the P series that need special headers. The engine has iron GT40 heads (not the GT40P's), an MSD 6 box and a Ford DuraSpark distributor and an Edelbrock 1406 600cfm carb. Mar 10, 2012 · I'm running GT40p heads, so headers aren't cheap, but I'm also thinking it would be cool to have the engine look like a hipo "K" motor. You should do more research, yes you will get better flow with the gt40 heads, they have 1. 72's B cam 70mm TB 73mm MAF stock airbox w/ a K&N 19lb injectors walbro 255 Mac longtubes base timing is 14* SCT tune some suspension work made ~268rwHP and ~300rwTQ on a dynojet thru a bone stock 1992 T-5 weight is ~2850lbs w May 25, 2010 · -289 bored . the 289 heads will give you a smaller comb chamber= more comp. SKU: JBE Proprietary JBA Firecone collector- Race proven technology for maximum hp/tq gains 3 Oct 24, 2013 · The only change that I know of will be with the angle of the plugs, so you may have issues with your existing headers/manifolds. I bought the heads professional rebuilt for $375 which was less than $500-700 quoted to rebuild my stock 289 heads. 8/351W) - anyone have experience with GT40P heads on a 92 351W - ive got a 92 F250 with a 351W that needs a pretty serious rebuild. ,but all the machine work will = the cost of a pretty good set of alum heads, esp if you shop. I had gt40p heads at one point. I plan to paint the aluminum intake, heads, and engine factory blue to give it a stock look. Sep 25, 2010 · SCCA American Sedan 306 Fords make 400+ HP using GT40/GT40P heads. TFS 190 11R heads, Victor 5. What kind of HP should I expect to get out of this motor with that cam? Oct 30, 2012 · 1995 Mustang GT Cnv 427 stroker, w/ 400 shot of NOS for fun 1996 Cobra with Kenne Bell 2. 6 roller rocker-torcher cam w/. I am considering buying it and changing the cam out to a comp. Nov 1, 2024 · Our 289 rebuild (. Jul 27, 2007 · You may want to check with Hedman Hedders or Hooker for specific headers for the GT40P heads to fit your 66. These heads were essentially the same as the earlier 66-67 289 heads with the small chambers. The other issues you will encounter are that with the GT40Ps you will need custom made extractors to fit into a Mustang (I had Pacemakers and they fouled May 30, 2006 · I found a 302HO with gt40p heads on it already rebuilt out of a 97 explorer. Expect to drop a half point in compression ratio, but you'll make up some flow due to the larger valves and improved exhaust runner. My questions basically boil down to: what do I need to do to make the swap? How do I plug the smog holes in the back of the head? Who makes or where can I get those plugs? Nov 19, 2020 · I have been told that the GT40p heads, a aluminum 4 barrel intake, a 4 barrel carburetor, full length headers, a slightly more aggressive cam shaft, and an msd ignition distributor would help drastically over the stock. I didn't build the motor but I know it's definitely a 289. Aug 3, 2011 · With the new head, not only did it meet emissions but did it with out an air pump and the P heads aren't drilled for the air pump either. 0L got the GT40P head. GT40p heads are a little different to as they have a moved spark plug for better combustion. 544", 212*/218*, 112LS) with matching valve springs and new lifters, 650 vacuum secondary carb and you should make about 280-300 flywheel HP @ 5600 with a broad torque curve. Jun 28, 2010 · Honestly, unless you're given a set of rebuilt E7's or you get them for less than $100, I wouldn't mess with them. Mar 22, 2019 · Ford GT40P Cylinder Heads Work Great With a Few Mods Many years ago, a friend bought a used 2001 Mercury Mountaineer 5. What is the best head(s) for a budget minded top end upgrade from stock. just my experience. 5:1 guessing) the car- 4 speed manual weighs 2500lbs i want Dec 12, 2000 · Commonly referred to as Explorer heads, GT-40P iron castings are found on current 5. I would like to transplant them onto the almost stock, freshly rebuilt 289 in my 67 Mustang. You can improve your 289 heads to be just as nice, bigger valves and some porting, but that will cost you more than $200. And when heads are surfaced to restore flatness, one removes . Aside from that, they will bolt right on. Oct 11, 2012 · You don't need to go crazy on the heads, mostly cleaning up the rough stuff. '94 Laser red 'vert. I vote cleaning up the 289 heads. The crank and rods are going to have to be forged steel and the pistons forged aluminum. they are bolt on HP 65-73 Mustang 289/302 w/GT40 P Head (0) Reviews: Write first review. 030, you would still have chambers too large. 970", $182. 7rr's. 0 or look for some Explorer's with a 5. I also understand you're on a budget. Similar to regular GT-40 heads, the biggest difference between the two is that the P-heads May 19, 2014 · I'm having some issues with misfiring on my 289. 5cc chambers. 0. They were so strong that the Chevy guys bitched and moaned so much that the club changed the rules to allow a spec Edlebrock head for everyone. 0 wich they used better flowing GT40p heads. 65mm edelbrock bbk throttle body, gt40p mid length headers Motor is a low mileage 306 short block with L2482F forged pistons trans is currently a c4, considering a aod swap. huge 69 CC heads and very restrictive exhaust ports, even worse then 289 heads but the over all combo worked well. Ported Hurricane Single Plane and custom 750 HP. But if you sit an think about it, adding the steam-hole in either the head or block does not prevent you from later using an older head on the block or gt40 again on the 5. That said, stock 289 heads don't flow well, so anything you do to improve them is going to be a huge help for power. In this, episode 64 part 1, DV and assistant Phil Stillwell show how to modify a set of original factory iron 289 heads to bring them up to vintage race spec Nov 20, 2015 · I finally finished my build. The GT40’s have 3, 1 1/2” tall lines, the GT40p’s have 4 and the non GT heads have May 2, 2018 · If you have 13 CC dished 289 pistons that’s another full point loss. Other then a good valve job, the heads were stock. If you do get the gt-40s you have to find new headers. And the gt-40s can be found on 97 and up ford explorers. 8's through '97. 040" over-high compression pistons bore fit-gt40p heads w/ 1. 940” Intake Valves Stainless 1 Piece Swirl-Polished Under-Cut Stems 1. get a little head work done, by head work I mean new valves springs retainers etc (this is not absolutly needed but if your getting float this will stop that) and If you can afford it, a nice port. Every body is worried about HP numbers but it's torque that counts. I've got the GT40 heads and they don't flow quite as well as the GT40Ps even though the GT40s have a larger exhaust valve. You might see "271 HP" associated with 289's a lot if you look around a bit. Apr 19, 2018 · You want 1977 to 1984 302 pushrods. I thought about using shorty headers but then thought about using 289 Hi-Po exhaust manifolds to keep it looking more stock. Feb 28, 2024 · And with just a little bit of cleanup work, they will significantly out-flow the GT40P heads! The 289 heads were all a pretty good design that responds very well to just a few minor improvements. Thanks! Jul 26, 2013 · Hi, I have acquired a set of freshly rebuilt GT40 heads for very, very cheap. 6 roller rockers, ported stock lower, msd 6a box . 73 gears and also to attempt tp port the heads. they work well. 65-67 hipo manifolds are the same correct? They do make special headers for the GT40p's. The "P" head does flow better than the standard GT40. Oct 31, 2011 · yes its ben done. It doesn't sound much does it? Apr 17, 2021 · For all of us interested in Gt40p heads. I'm not a big fan of the alphabet cams though Feb 19, 2006 · well my set up is alil more radical gt-40 intake. 8/351W) - GT40P heads? how hard to put on? how much HP and torque? - I have a 1989 f150 with a 302 5 spd. The P motor also makes more power. It has the E7, 289, 351, and GT40P heads all tested. 73 rear gears, Barry Grant fuel cell, Pro-motion T5 Jun 3, 2021 · But the GT40 heads are a nice breathing upgrade, and have hard seats, and normal plug angle. The new heads would flow some better, but the big chambers will lose you enough compression that, overall, you'll lose. The heads really, really sucked. The 5. HEADS GT40P . Even if you cut the heads . the 289 heads do make for higher compression but will not compare to the gt-40 or gt-40p heads. 579 lift, Victor Jr, MSD Pro-billet mech adv distributor, Scorpion 1. Jan 30, 2019 · I agree with the intake manifold, Summit SUM226033, pad height 4. the engine was called a "boss 289" not a clevor, a clevor was a 351W with 351C heads and a custom intake. Rebuilding what you have with an eye towards more performance has always been a popular way to go. Features This work combined with the big Lunati cam made 375 hp at 6,400 rpm. 0 Mustang that ran really, really well. 6 pedestals rockers, 3. i can pick the parts for a good deal. You'll want to plug any smog holes in them. 5:1 compression with the 289 crank as I thought. 4. Mar 17, 2002 · I know for a fact that one Trophy Stock car from last year was making right near 390 rwhp with unported GT40P heads, and an unported Performer RPM intake, and the spec 650 HP Holley carb. . Oct 8, 2020 · Here a comparison of different heads on a 302: +30 HP compared to the stock heads. My question is, does anyone know for certain which headers will work with GT40p heads, t5 conversion Jul 5, 2010 · Stock H. I'm thinking on using the e303, 24lbs inject, massair 70mm, 1. Invest in a good pair of heads. The Powerheads ported heads or an aftermarket head will be well worth the money. Aug 19, 2013 · The problem with using non 289 heads is the CR. 24# injectors. Im also fuel injected. GT40 heads have a 65cc chamber. 5 Cc chambers. I doubt that you can get a set of aftermarket heads that will work out of the box for less than the price of having the GT40P heads worked over. May 17, 2008 · Small Block V8 (221, 260, 289, 5. Nov 27, 2021 · I like the 65 289 heads also. Aug 22, 2007 · Also the gt-40 heads will be better than the 289's. Will accept the same snazzy aluminum heads and stuff as newer 302's and 5. 500" valve lift where GT40s are better over 0. I would either do as Pat said and fix up a set of 289 heads or maybe a set of GT40P heads. If something could go wrong, heads are a cheaper replacement item than the block. These are among the best of the iron Ford Windsor heads as they tend to flow much better than earlier castings. The most earlier 289 and the 302 J code heads had 54. cam has a little better grind when combined with the 1. 6RR's, bbk full length headers, Canton 7 Qt pan, Flow 40's, Holley 725 Double pumper carb jetted, 125 HP nitrous shot, Full QA1 front suspenion kit, BBk subframe ties, 3. 7 ratio cobra rockers giving you more hp/tq than the cobra cam setup. There's another thread about this right now too Apr 12, 2020 · what is the best cam match up with stock gt40p heads with upgraded spring and a 3 angle valve job. much better than any of the other factory heads. Not the same as power Oct 27, 2018 · To me it seemed like drilling into the heads would be the route with the least risk. They even let the Chevy guys build old style 4" bore 302's Here are the specs on the 400HP engines: Jun 1, 2010 · These are restrictive port, small valve iron heads, but are nicer (smoother) and flow more than the 289 heads. But even they will respond to a mild cam well. I believe this head was developed for improved emissions but features a smaller combustion chamber, smaller intake valve, and a different spark plug position. Going into a 73 mustang. 023 cut will give the heads a 55cc combustion chamber, and will it affect the intake manifold or port match on a Edelbrock 289 Performer? I appreciate any expertise. Sep 10, 2015 · ford got 271 hp from a 289 with box stock heads and a crappy intake manifold. 003 or . Dec 12, 2010 · GT40P heads,shaved . 010" exploder intake do it yourself basement port cleanup on heads&intake Crane beehives scorpion 1. No change at all compared to the E7 heads as far as outer hardware Nov 10, 2009 · I might be wrong but it looks like you will lose hp. O. By the time you actually measure everything to find the true CR of a 289, I'll bet a C is low 8's and a A is low 9's. Your old heads are the weak link in anything you do. i've got a short block started, and i recently came across a set of GT40P heads for FREE ( love family members) i'd love to use these heads, Feb 25, 2008 · Re: Witch cam in a 289. Jun 18, 2010 · I would the think headers, better intake, and better carb on the Shelby version could gain 35 hp. I would search around for a set of the actual GT40 heads off of a '93-'95 Cobra. The H. Hot Rod got 388 hp! I also saw another mag that made about the same power on a 302 IIRC. or questions. Some aftermarket headers work better than others for the GT40P heads. Aug 27, 2011 · the 69-70 351 heads used to be the best, milled . Sep 4, 2008 · First, I do have the GT40P heads and I am using a old, custom manifold, I had no trouble fitting intake, it was built about the time of the 289. They can be modified to support 500 HP, but if you can live with the caveats that Mustang4SF mentioned, i'd use the GT40P heads over 65 289 heads assuming we are talking about comparison of stock unported heads. 78:1 compression Thanks for your opinion. I thinking that ford would improve the letter cams to keep up with competitions (any takers). 72 rockers, a b303 cam and installed headers and made just under 300WHP. The engine should be around 325HP according to Edelbrock's tech sheet. if you have enough money [around We dispel fears about installing GT40p heads onto a vintage 289/302 by showing you that you can in fact use them if you also install some cast iron HiPo styl Feb 12, 2010 · just get gt40p heads and I see that alot of guys are against the e303cam saying it's outdated. 73 gears. As 2bav8 said, they have an efficient chamber, Hot Rod made peak power on that run with only 28 degree total advance. apvm nwxqy smay xzqcz wtiwj fiaock ccjftpd jdmqe qeiosr fugq ubgbdz qbqekha kkz kkclogh jfizbnd