built one using a 91' HO short block with a set of AFR 165 heads, Weiand . You will have to get special headers to fit these heads since the spark plugs are angled differently than normal 5.0 heads. The car weighs #2835 with driver. Finally, we exchanged the Explorer's EFI manifold (which is a pretty good manifold in its own right) for an Edelbrock Performer RPM Air Gap intake and a Holley 750-cfm HP-style carburetor. If you smooth out the bowls and exhaust ports and gasket match the intakes they should flow decent. Mild Build Gt40p THANKS VERY MUCH! We heated the bottle to 950 psi and hit the button at 4,500 rpm. With the P-heads requiring pedestal-mount rockers, we also called up Crane Cams for a set of 1.6 pedestal-mount roller rockers. Because of this, your tuneup will probably need to be modified. Dyno results GT40P heads | Vintage Mustang Forums I'll save the effort and lighten my front end by 50# with aluminum. Please include what you were doing when this page came up and the Cloudflare Ray ID found at the bottom of this page. There are literally a dozen or so camshaft companies that offer a mild hydraulic roller cam for a 5.0L Ford. With nitrous, this is easily a mid-11-second ride. will gt40p heads fit on a 302 | Ford Mustang Forum You could run a thinner head gasket as well. FULL DYNO RESULTS. Mar 23, 2004. Worst AFR 165 dyno ever | Factory Five Racing Forum A good port job can set you back another $500-$1,000. The valve seats have been cut on a . The reason this new generation of Ford engines make a ton more power is they also enjoy fantastic cylinder heads and four valves per cylinder. They suffered from poor aftermarket support up until about 15 years ago when it really came on strong. 402 HP NA from a HI PO 289 isnt that mysterious of a feat to accomplish with todays SBF Aftermarket parts availability. Real world data seems to show that GT40 or GT40P cylinder heads, assuming no other mods on your Foxbody, are good to add anywhere between 20-40 HP (over stock heads). Test 2: Changed to the smaller of the two Lunati camshaftsno other changes. Most all long tubes come out far enough to clear and other short tube headers will work but there is clearance issues on two of the cylinders. Mustang Cylinder Head & Camshaft Guide (79-95) - LMR Note the head bolt hole issue, some GT40 iron heads had 1/2 holes, if not they will need to be enlarged. We turned to Rare Auto Design in Orlando for dyno tests to find out how much horsepower we gained. But what we were most impressed with was the solid gain in torque over the smaller Voodoo cam from 3,500 and up. $700.98. Can I run the new cam with the same roller hydraulic lifters or do I have to change the lifters too? For both the GT40 and GT40p heads, I STRONGLY suggest upgrading the valve springs. Per a UEM tech support email I have the Icon IC736 is supposed to be good for GT40 heads when I asked about it. The specs are a conservative 212/218 degrees of duration at 0.050-inch tappet lift but offer a really nice 0.512-inch valve lift for both the intake and exhaust. Joined: Sun Mar 15, 2009 9:31 am. this head is complete with new 1.837 int valves and 1.536 exhaust valves. 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. These are Ford iron GT-40P heads. But don't think that adding a bigger camshaft will make more power. After we installed the heads and with the fan off, he ran a 12.46 at 107.9. It's a classic move we've pulled off many times. If you dont feel comfortable doing this higher a pro. I've not seen a set of longtubes that have an issue with GT40P's, either. 302 GT40 Dyno Results - FourEyedPride.com This 1979-1995 Mustang cylinder head and camshaft guide will overview the heads and cams we offer and how they will coincide. Ive been building ENGINES for 40+ years. Yes- thank you. 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! United Engine and Machine sells cheap but decent pistons that will do what you're wanting. For real performance, stock E7TE heads leave a lot to be desired. These are among the best of the iron Ford Windsor heads as they tend to flow much better than earlier castings. Not *as* good as the GT40p heads, but I'd prefer to not have to worry about exhaust fitment issues, or have a narrow range of what I can work with. The only way to really make more power is to go with a stroker kit, blower and/or heads. Let us explain. Anythoughts? Win or lose, if you buy the ticket you must take the ride. how much HP and torque? Free shipping. Also, the spark plug angle makes it a pain. +1 I would go with the regular GT40 heads. ***Most important is theStupid question is the one that was never asked!*** Junkyard Gt40p Heads-add 30+ Hp to Your 5.0l (For Free?) I may do some port matching and a little cleanup, otherwise just a set of springs and cam and see what I have. Speedmaster PCE281.2046 Small Block Ford Aluminum Cylinder Heads 62cc 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 got a set of AFR heads , night and day. Application Fits 1979-95 Mustang 302/351 w/ OEM Small Block Ford Heads You might even say its like flogging a dead horse without any animals actually being injured during my moments of sarcasm. Location: Re: Stock Ford 351W 4bbl dyno numbers. Took me 7 hours to do one head.but they cleaned up real nice. 02-11-2012, 07:16 PM #6 fiveoh 86lx You didnt provide a lot of information about the engine itself, Im assuming its 85 or newer ( roller cam) May need a freshen up of the bottom end if compression is the issue. 351W D0OE-C heads better than GT40P\'s? - Ford Muscle Cars Tech Forum The results were a major increase in power throughout the entire rev range, with an increase of 60hp at 4500rpm through to a peak of 279hp at 5800rpm. The Fora platform includes forum software by XenForo. Building 400hp Into A 5.0L Small-Block Engine - MotorTrend I used Lightning heads on my 302, (GT40 not P) with stock rockers on a flat tappet engine. Step 1. They also have emissions legal heads as well. Build Thread 1965 Fastback Project "Racesteed". I ran the Speed Pro L2488 pistons and it had me around 9.9 compression with a .041 head gasket, Now I had GT40 heads milled .020 and so that's just a guess on the CC. You just want to keep it out of detonation. We compare the GT40s to modern cylinder heads as well as other heads from the era. JavaScript is disabled. With gt40p heads and 289 hipo exhaust manifolds changing sparkplugs is the same as the original 302 heads and manifolds, I use the spark plugs that are recomended for the explorer with gt40p heads and you can use straight or angled boots. Central Coast Mustang sells GT-40P heads at a great price, making them a viable alternative in a market flooded with performance head choices. The dyno recorded a peak horsepower reading of 489 hp, but the air/fuel ratio was slightly on the rich side at 11.5:1, so we increased the nitrous jet to a 61 and hit the button again. Im new and Im currently building a 302 on a budget and want to raise compression without milling heads but by pistons and I want to get close to 10:1. However, stepping up in the performance head market will set you back more than $1,200 for a decent pair of aluminum castings--and that's straight out of the box, with no porting. What did the heads flow? You didnt mention what camshaft you would be choosing or exactly which 5.0L Ford Windsor engine you are working with. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. FORD GT40p 4 BAR HEADS IN GOOD CONDITION . Cant wait to try um out. I am sure you have increased the bore size and possibly even the stroke a bit and spin it up pretty high in the RPM range. I'm sure the dyno operator used some goofball correction factor to make the numbers look higher. If this is beyond your technical ability, you could ask a local machine shop to perform the modifications. I'm wondering how these heads will interact with the paxton 1220 sl supercharger I'm trying to put on. I'd get the gt40 setup, and put an s trim on it. Ford's seminal 302 engine (later re-dubbed the 5.0) has been popular with budget-minded hot rodders for decades. For the first test, we were reusing the stock Explorer cam, so the engine didn't need any break-in time. We then dyno'd the car without the fan to get some consistency and were rewarded with a peak of 316 hp at 5,500 rpm, and 348 lb-ft of torque at 4,000 rpm. However, when we dyno'd the car before installing the GT-40P heads, the fan was on the car. 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). Well offer one as an example. 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. Once you get into the FoMoCo aftermarket aluminum GT40s though, all bets are off. Do not ever, ever think about using the tube type manifolds. This is the main reason why these engines are not modified as much as the small block Chevy. Cloudflare Ray ID: 7a2e2d95dedea1e4 These are some of the pictures I have showing the Explorer manifolds. i have a 302 engine from a 1977 granada and i am wondering if gt40p heads from an explorer will fit on this motor. Choose a cylinder head before you install the pistons. This is an older thread, you may not receive a response, and could be reviving an old thread. We know what you're thinking--only two-tenths from an extra 45 hp? 302 with GT40 heads | Ford Mustang Forums I'm running BBK un-equal length shorty's, and I'm able to get all the plugs in, tight, and all plug wires on. The engine was only rated at 215 hp, but it at least had 9.0:1 compression. You can have your current 28 oz rebalanced to 50. Small-block Fords and Mopars only use four head bolts per cylinder, so retaining proper head-gasket sealespecially with nitrousis a point that demands attention, so we ordered a set of Fel-Pro MLS head gaskets rather than a standard, composition gasket. (A starter is a motor, windshield wipers use a motor,electric windows use motors) Any one uses that terminology in my shop will be corrected once, only once. And agree the cams do help and a few tricks with the heads that I have discovered really make a difference. The HP DIFF column on the far right lists the horsepower difference between Test 1 and Test 3. I'm an old school guy (289 in 65 mustang), and I'm just looking into the new 5.0 engine (roller cam) stuff recently. Assuming the above configurationa pushrod 5.0L will potentially make between 250 and 260 hp. That's a 40 per cent increase in power from a simple head and cam swap, and one seriously happy Mustang owner! Install a set of 1.7:1 roller-tipped rocker arms on the heads. I have a 66 mustang with its original untouched 289 with over 140 k on it that Ive been running a blow thru turbo making 14 lbs of boost on for the last 5 years and its never given me a problem. 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. The headers will improve this airflow throughout the entire rpm rangeadding more torque and horsepower. Ford 302W / 5.0L History & Specifications - The Ranger Station 950.00 us a set and will ship . We probably could have coaxed an even 300 hp out of this stock configuration, but with such good numbers, we decided to jump right into the first Lunati cam. We took the heads to Mike Slover of Slover's Porting Service in Sun Valley, California, to do this work, plus some basic pocket-porting to improve flowespecially on the exhaust side. Instructions on porting the GT-40p heads here. (Please note these are not GT40P Explorer heads). JavaScript is disabled. The Edelbrock Performer RPM is a good choice, but Holley, Weiand and Ford Motorsport also have similar offerings. This will cost additional money but is still worth it, in our opinion. In addition, the cam timing was designed for torque, with duration somewhere around 190 degrees at 0.050 with roughly 0.450-inch lift. GT40P heads, what kind of performance do they give? All costing in the end at least another $2k. Is asking advice for a fairly common situation involving parts with mandatory compatibility between the two for performance and longevity. Because of this, your tuneup will probably need to be modified. A forum community dedicated to Ford Mustang owners and enthusiasts. Shop by category. Some ideas never go out of style. Weiand 7515 xcellerator intake. In mid-1997, the Explorer and Mountaineer 5.0 L heads were revised and renamed . We started with a 120,000-mile 5.0L out of a Ford Explorer, removed the EFI and DIS, and pocket ported the stock GT40P iron heads with stock valve sizes. Someone does make the Tri-Y's headers for the early Mustangs using the "P" heads. Stock heads with a fresh 3-angle valve job, shorty headers, T5, 4.10s, stock Explorer intake and stock '88 GT short block with 140,000 miles on it and an E cam in it. 289 or 351 heads on a 302 advantage? | The H.A.M.B. I recall having an absolute blast with my old K-code coupe back in the day. This engine will be good for your 65 Mustang. Long tube headers are a terrific idea, but you need to open up the exhaust side. We've seen what happens from previous Ford experience when power levels above 500 hp tend to either pop head gaskets or saw blocks in half. Jeff Smith has had a passion for cars since he began working at his grandfather's gas station at the age 10. .. i would not buy valves unless you need them amd would not switch to studs with these heads for your low hp . by travis Sun May 03, 2020 8:33 am. The heads that were used were also old C8 casting with 58cc chambers. Compare. Stock 1989 5.0L HO pistons will work if you can find them. Theres many options available for a little more power. JEGS High Performance. What you are trying to do is to increase the amount of airflow through the engine in order to make more power. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. For a better experience, please enable JavaScript in your browser before proceeding. They almost seem like flywheel numbers rather than RWHP numbers. Shop by category. You didnt mention which cam you had in mind. In 1987, he assumed the role of editor for Hot Rod magazine before returning to his first love of writing technical stories. I'm using the Trick Flow stage 1 cam with 1.7 roller rockers. I added a link to it. The MPH was there to run a little better but the local track is about terrible. The kit offers adjustable power from 50 to 250 hp with a simple jet change. A LOT of them do it these days. The tube headers showed a gain of almost 100 hp! GT40P heads, 302 and Victor Jr. intake: - Factory Five Racing Forum $169.50. You will have to address the 50 oz balance of the 5.0 engine by getting a 50 oz flywheel. Im a different animal. Definitely going to use my P heads. 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. A bit of info for those looking to build 300+hp 5.0L/302s Install a set of GT-40P cylinder heads from a late 1990's Ford Explorer or a set of GT40 heads from an early 1990's Mustang 5.0L. And remember ENGINES have been being built/rebuilt/modified for years. Paying a premium for a set of GT40P heads or dumping money into some to get their performance to rival aftermarket is not for me. P-heads have a smaller combustion chamber at 59cc, which will bump the compression ratio up on an otherwise-stock 5.0 engine. It has underdrive pulleys, MSD ignition, Bassanni headers and forward exit exhaust. Nice to see actual dyno results instead of "butt dyno" guesses. Using the manufacturer recommended springs for your camshaft are a safe bet. With the engine reassembled, we boxed up our second camshaft and headed for Westech's dyno. When compared to the new generation of performance engines on the market today like the 5.0L DOHC Coyote engine, your engine will not come close. In review, we rescued a used 5.0L Ford from the boneyard, ported the heads, added a cam, carburetor, intake manifold, and headers, and pulled an amazing 376 hp out of the mix. Very true about finding them at the local yards. We didn't increase the valve size, although we did have to add Manley valves to get the proper spring-installed height. bmcdaniel, Feb 17, 2004 #7. v8maverick Member. Everything fits, use the stock rockers and pushrods. The 2 heads are about the same when looking at the numbers with the GT40p heads having a slight edge. They are more expensive than standard head gaskets, but they also do the job and are worth the additional money. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Headers and a camshaft will help but the engine really needs aftermarket 3/8 inch connecting rod bolts and aftermarket cylinder heads. Works on all factory cast iron E7, GT40, and GT40P cylinder heads! GT-40P Heads - 5.0 Mustang & Super Fords Magazine - MotorTrend P-heads have a smaller combustion chamber at 59cc, which will bump the compression ratio up on an otherwise-stock 5.0 engine. Perhaps even more surprising was how well this engine idled, calmly purring with 16 inches of manifold vacuum at 980 rpm. Manual trans. What would be the best cam and springs to use for these heads in a 302 Windsor? Really hurt too. 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. But dont think that adding a bigger camshaft will make more power. '85 GT vert two tone (white on charcoal)white leather, http://www.facebook.com/groups/233213650060739/, http://www.summitracing.com/parts/TFS-2500100/, ascMcLaren & Motorsport/Grand Prix IV Capris, RHD and Other International/Export Models, Mods, Maintenance & Mechanical FAQs/Archive, If this is your first visit, be sure to 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. The spark plug issue is almost a non-issue. One benefit gt40P head will have over other 80's-90's model heads, including the gt40 head, is that it has a smaller combustion chamber much like the original 289 heads. Then why did you port the heads and how do you know if you made an improvement. I have a 302 Windsor V8 EFI engine that I converted to a 600 cfm carburetor with a Street Warrior intake manifold. 87-93-95 Ford Mustang GT40P Engine Cylinder Heads REBUILT 302 351 GT40 We also added a veteran Ford magnetic pickup distributor and used it to drive an MSD ignition system.
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