302 with gt40p heads horsepower

I got a GT40P off the assembly line years ago. made more power everytwhere and 40 hp is respectable. Advanced: Daily Deals; Help & Contact; Sell; My eBay Expand My . built one using a 91' HO short block with a set of AFR 165 heads, Weiand . If you're running a stock cam, 1.7 rockers will work perfectly. Shop by category. $700.98. In order to make Coyote-type power you will need some expensive, high-flow cylinder heads with a short block that can withstand spinning in excess of 6,500 rpm. Every thing he tells you on this site is true. While we've seen engine dyno tests performed with GT-40P heads replacing factory E7TE castings and resulting in a boost of more than 25 hp, we have reluctantly set our horsepower gain goal at 25 ponies, as well. 402 HP NA from a HI PO 289 isnt that mysterious of a feat to accomplish with todays SBF Aftermarket parts availability. Free shipping. Compare. I went to a couple in Tucson and almost all the Ford vehicles that came with a 5.0 had the heads missing. #2::: Get advice from a reptile engine builder with experience(first flag for me is when somebody refers to an ENGINE as a MOTOR! The engine never huffed oil out of the breathers, and the spark plugs all looked excellent. As a final goal, we decided to bolt on a simple nitrous system and see if we could push this little small-block Ford to make some real power. We also added a veteran Ford magnetic pickup distributor and used it to drive an MSD ignition system. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. ported GT-40p, ported cobra intake, 65mm BBK, e-cam with 1.7s, longtubes, off-road x-pipe with flowmasters dumped. Very true about finding them at the local yards. Find many great new & used options and get the best deals for FORD GT40p 4 BAR HEADS IN GOOD CONDITION w/ONE BOLT BROKEN at the best online prices at eBay! Nice to see actual dyno results instead of "butt dyno" guesses. A forum community dedicated to vintage Ford Mustang owners and enthusiasts. Best of all, no machining is required to install these on your stock cast iron heads! 1 - 7 of 7 Posts. $169.50. I turned it because it was tired when I got it. Yep my **** is coming apart again Isnt life great! They were located in Tahachapi CA, and were sold with upgraded springs for $650.00, back in 2002-2003 ish. Mar 23, 2004. The GT40P heads flow a lot better than stock 351 heads. FORD GT40p 4 BAR HEADS IN GOOD CONDITION . While the heads were off getting a massage, we turned our attention to the cam timing. These are some of the pictures I have showing the Explorer manifolds. The Fora platform includes forum software by XenForo. Not sure how they would mate up to your existing exhuast, but otherwise they should work. This combination should be good for about 400 horsepower and as much as 500 if you opt to use the stronger aftermarket pistons. Cant wait to try um out. Ive bought wrecking yard SBFs and put 20 lbs of boost to them and spin them to 7000 and made 500 HP with several of them. However realistically, with the amount of money spent modifying the gt40p heads or even those older 289 & 351w heads, you could have even better performing aluminum heads. FULL DYNO RESULTS. We bolted the Ford to the dyno with a set of 158-inch long-tube headers and an 18-inch collector extension to help the low-speed torque, then we fired up the small-block. I'd much rather be able to drive it at 8 or 9/10s of what it can handle. GT40s have 64cc chambers. The entire front accessory drive and timing chain cover must be removed, along with the distributor and intake manifold. A forum community dedicated to Ford Mustang owners and enthusiasts. I was thinking the same but the enforcers are $647ea now so $1400 (inc tax) is the entry price for good set of heads. are you twisted331 also? We turned to Rare Auto Design in Orlando for dyno tests to find out how much horsepower we gained. Anyways, I know the gt40ps will bump . Also, you'll need to get a steel distributor gear to replace the iron gear that is currently on your distributor. It has underdrive pulleys, MSD ignition, Bassanni headers and forward exit exhaust. The GT40P heads flow a lot better than stock 351 heads. In an effort to preserve the history of the Early Fox Era, FEP covers the following vehicles: 79-86 Mustang and Capri, 84-86 Mustang SVO, 78-83 Fairmont & Zephyr, 83-86 LTD & Marquis, 80-88 Thunderbird & Cougar, 82-87 Continental, 84-92 Mark VII, 81-82 Granada. just curious. Its NA but makes use of AFR heads and some other aftermarket goodies. I got a set of AFR heads , night and day. The rest went very smoothly, and we reused the stock lifters and suffered no ulcers worrying about breaking in the cam. Small Block V8 (221, 260, 289, 5.0/302, 5.8/351W) - anyone have experience with GT40P heads on a 92 351W - ive got a 92 F250 with a 351W that needs a pretty serious rebuild. Ford offered a performance head that was a stock part on 1993-1995 Mustang Cobra models and pre- 1997-1/2 Ford Explorers and Mercury Mountaineers equipped with the 5.0 L engine called the GT-40 head (casting ID F3ZE-AA). I have heard this rod bolt weakness myth for years but have yet to have a single problem with them in any of the SBF engines I have pounded on for the last 30 years and there have been lots of them. There are caveats to this plan, however. Keep in mind that swapping camshafts is a fairly extensive effort. We didn't increase the valve size, although we did have to add Manley valves to get the proper spring-installed height. Our recommendation would be, rather than change the camshaft, you might want to look into adding a set of long-tube headers and a dual exhaust if the engine is not already so equipped. This is a common mistake with first-time cam buyers who dont necessarily appreciate that the cam is just one component of the overall engine package. Dennis Hilliard of Central Coast says we can expect to gain three-tenths in the quarter-mile. AFR 165 Heads | Have options for pedestal mounted rocker arms or stud mounted rocker arms. Tim's junkyard refugee survived the beating and we had a bitchin' story. For a better experience, please enable JavaScript in your browser before proceeding. We also added an Edelbrock Performer RPM dual-plane intake and a set of 158-inch headers with no mufflers. In a 3,250-pound car like a Mustang with 3.50 gears and an automatic with a 2,800-rpm converter, this 5.0L could pull 12.80s at 108 mph. Step 1. Can I run the new cam with the same roller hydraulic lifters or do I have to change the lifters too? The 5.0L with the GT40 head had a 9.0:1 compression, and the 5.0L with the GT40P head had 9.1:1 compression. I added a link to it. Ford GT40P 302 5.0L 4 Bar Cylinder Head Assembly Pair w/ 1/2" Head Bolt Hole. The GT40P heads had a small combustion chamber ranging from 58-61cc while the GT40 heads had a 63-66cc combustion chamber. The GTp heads are like GT 40's with smaller combustion chambers and the spark plugs are relocated for a more efficient burn. $139.99. This is the main reason why these engines are not modified as much as the small block Chevy. Most of the time, GT-40 heads are worth a good 20-40hp over stock heads. Long tube headers are a terrific idea, but you need to open up the exhaust side. I wouldnt recommend reusing lifters though. Here is my setup. In addition, the cam timing was designed for torque, with duration somewhere around 190 degrees at 0.050 with roughly 0.450-inch lift. Do you guys have part numbers for the spring kits? . If I get different urges later, Ill pursue those then. As usual, there is much more to this story. Actually, making around 240 to 250 hp with a near-stock Windsor 302 will feel pretty good. Good on ya Jeff Smith. I spin it to 6500 and thats about it. 302 explorer short block with roughly 80k miles GT40's from a local u pull n pay ($97) weiand x-celerator trick flow stage 1 cam 650 holley double pumper car made 322/329 SAE . Thanks for the help, I was planning on puttingin roller rockers or at least new springs, and that engine looks great, hoppfully mine will look at least similar to that one of these days. Here a comparison of different heads on a 302: I'm very happy with my GT40P. Holten tells us removing the fan is worth two-tenths in itself, which tells us the fan soaks up roughly 20 hp. I may do some port matching and a little cleanup, otherwise just a set of springs and cam and see what I have. thats after 3 hours of idling/midrange hits to tune the idle and part throttle . These timeslips are from 1280' above sea level. JEGS High Performance. They almost seem like flywheel numbers rather than RWHP numbers. Yea. How much HP and torque do you think I. P-heads have a smaller combustion chamber at 59cc, which will bump the compression ratio up on an otherwise-stock 5.0 engine. JavaScript is disabled. I guess someone could just do a basic valve job and throw on the GT40 upper/lower intake for a cheap HP boost. Or, you could invest in a new set of heads that would also do the same job but you can expect to spend quite a bit more money. We decided to test both ideas, so we ordered two roller cams from Lunati: a shorter-duration cam that would deliver decent idle vacuum and maybe make around 320 to 335 hp, and a longer-duration version that might push the horsepower up to perhaps 350 hp. Do not ever, ever think about using the tube type manifolds. Commonly referred to as Explorer heads, GT-40P iron castings are found on current 5.0-equipped Explorers. AFR 165cc 58cc Heads. The Fora platform includes forum software by XenForo. Yes- thank you. Keywords Here is the lowdown on exhaust manifolds and VALVE SPRINGS. Install a Ford Motorsport E303, X303 or F303 cam, or any of the similar units from Indy, Lunati or your favorite manufacturer. These heads have been remanufactured using refaced reclaimed Factory Valves. Even with a stock Mustang 5.0 cam makes good power. We are offering a pair of original Ford Cobra 5.0 GT40 cast iron cylinder heads. Test 1: 750-cfm carburetor, dual-plane intake manifold, and stock camshaft. Always the weak area in the 289 and 302 is the tiny 5/16 inch connecting rod bolts and the miniscule intake and exhaust ports. Eldelbrocks Air Gap intake manifold should work well with the combination. Check my post above. JavaScript is disabled. We compare the GT40s to modern cylinder heads as well as other heads from the era. But the part about a cam replacement possibly being a labor intensive undertaking is correct. This will follow the guideline of a 1.6 rocker baseline and factory bottom end 79-95 related 5.0L Mustangs only. A LOT of them do it these days. You will have to address the 50 oz balance of the 5.0 engine by getting a 50 oz flywheel. Boy, were we surprised with the results. Just put some 1.7 pedistal rocker arm on along with a mild camshaft (make sure to use the correct valve springs), you will make over 300 flywheel hp. HAD '82 GT monochromatic (red).black cloth HAVE Actually the regular gt40's in either aluminum or iron are the good ones but the gt40p's are only a slight improvement over regular 302 heads. What you are trying to do is to increase the amount of airflow through the engine in order to make more power.