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. Vehicle: 1972 2 door 302 maverick, 1986 5.0 stang gt convertible,66 mustang coupe, HEMI ram. Jeff Smith has had a passion for cars since he began working at his grandfather's gas station at the age 10. the engine is carburated of that makes a difference. Add 40 to 70 HP to your 302 yourself - Factory Five Racing Forum If you're running a stock cam, 1.7 rockers will work perfectly. 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. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. P-heads have a smaller combustion chamber at 59cc, which will bump the compression ratio up on an otherwise-stock 5.0 engine. 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. Just make sure it is a roller cam. The heads also required some machine work, including screw-in studs, guideplates, and widening the spring pockets for bigger valvesprings. I have to agree, the GT40P heads flow better than the GT40 iron heads. Sponsored. Calculating pushrod length Can anyone give me a little feedback about a '99 Explorer 5.0, and tell me if it's my answer. In 1987, he assumed the role of editor for Hot Rod magazine before returning to his first love of writing technical stories. Richard Rowe has been writing professionally since 2007, specializing in automotive topics. You should be able to get away with a 150 to 200 horsepower shot later, but it's best to start out small and work up. The Fora platform includes forum software by XenForo. FORD, SMALL BLOCK 302 HO w/ E7, GT40P & GT40 - Alex's Parts Im a different animal. We decided on a Powerstar kit from Nitrous Supply, owned by our good friend Mike Thermos, who was one of the original nitrous kit suppliers back in the early '80s. Building 400hp Into A 5.0L Small-Block Engine - MotorTrend well i finally did my first ever carb build, ive always been an EFI guy Black 1985 GT: 408w, in the 6's in the 1/8 mile. You will have to get special headers to fit these heads since the spark plugs are angled differently than normal 5.0 heads. Really hurt too. Learn how your comment data is processed. We also added a veteran Ford magnetic pickup distributor and used it to drive an MSD ignition system. T5z and 3.89 9" TL rear. These are among the best of the iron Ford Windsor heads as they tend to flow much better than earlier castings. Because of this, your tuneup will probably need to be modified. Install a set of 1.7:1 roller-tipped rocker arms on the heads. This will keep you from dropping your overall static compression ratio and losing power. When I purchased my "brand new" set of GT40P's, I bought them from an Mustang specific machine shop that used to exist called Central Coast Mustang. (Image/Harrison Creamery). Calculated compression to 9.8:1. Manual trans. Torque on the other hand isnt something to write home about. The '00 Ford Explorers and Mercury Moutaineers were factory equipped with one of Ford's better 5.0L motors. Smith began writing for Car Craft magazine in 1979 and became editor in 1984. .. i would not buy valves unless you need them amd would not switch to studs with these heads for your low hp . Consider having the head's intake ports matched to the intake manifold gasket. For both the GT40 and GT40p heads, I STRONGLY suggest upgrading the valve springs. Because its all been done time after time after. Last Edit: January 18, 2015, 12:05:31 pm by businesstrader Logged shaunp. However there are plenty of factory heads that with the help of an experienced machine shop can be great. That's fantastic for the minimal investment we made. Once the headers are in place, then you can consider if you still want more power. Now we know why Dennis Hilliard of Central Coast Mustang is so high on these heads. They almost seem like flywheel numbers rather than RWHP numbers. This is a function of the somewhat wider lobe-separation angle of 112 degrees. The GT40P heads had a small combustion chamber ranging from 58-61cc while the GT40 heads had a 63-66cc combustion chamber. Good on ya Jeff Smith. We also discovered some issues with the GT40P heads that required changes, so we added valves from Manley that eliminated the exhaust-valve rotators and allowed us to set the proper valvespring installed height. Understanding Ford's Fox Body GT40 Cylinder Heads - CJ Pony Parts Instructions on porting the GT-40p heads here. We heated the bottle to 950 psi and hit the button at 4,500 rpm. In less than an hour, we were ready to test. 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. What Are The GT40 & GT40P Heads? - LMR.com Took me 7 hours to do one head.but they cleaned up real nice. There is a better way. 1979 Indy 500 Pace Car. Here is the lowdown on exhaust manifolds and VALVE SPRINGS. Supercharging GT40p heads | Modded Mustang Forums Not looking for crazy HP. I plan on running a AFM b31 cam too which has relatively small duration for the intake valve. As noted, this is looking like hes building a 351 Lightning truck motor, which is a good way to go. Ha! 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. Application Fits 1979-95 Mustang 302/351 w/ OEM Small Block Ford Heads Commonly referred to as Explorer heads, GT-40P iron castings are found on current 5.0-equipped Explorers. Good Luck. bmcdaniel, Feb 17, 2004 #7. v8maverick Member. Click to reveal They fill that spot between power and budget. . Without changing the stock pistons. I used Lightning heads on my 302, (GT40 not P) with stock rockers on a flat tappet engine. Yeah, out of a bolt on upgrade, you'd probably be looking at 260-280rwhp ish with supporting mods. You didnt mention which cam you had in mind. Hey Motorheadty,Like your comments,question for ya,I have a 92 convertible,just bought a 5.0 out of a 94 gt that was just freshened up top end,gt40p heads w/new springs etc for the new E303 cam,new FRP roller lifters,Crane 1.7 rockers,hardened push rods,double roller timing set,all put on a bottom end w/104000 miles,needless to say previous owner pulled said engine after 800 miles and now building a 351,I pulled engine down my machinest,putting forged internals in and bolting everything back together,I want to run about a 150 shot N2o,and iam going carb,wondering which intake would be best w/the 150 shot,heard that dual planes might not be the way to go? Get 500 Horsepower from a Junkyard Ford Explorer 302 - MotorTrend It's an 86 roller 5.0 engine that had a recent rebuild sometime in the past with keith black pistons, otherwise stock. 1985 Mustang GT Mild 331 4bbl 5 spd, 1985 SEFI LTD LX AOD. This website is using a security service to protect itself from online attacks. The only way to really make more power is to go with a stroker kit, blower and/or heads. I think one of the finer traits of a true car guy, is the patience to put a prized car away and just let it sit for a while rather than selling it when life gets in the way. I turned it because it was tired when I got it. 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. I got a GT40P off the assembly line years ago. Can I run the new cam with the same roller hydraulic lifters or do I have to change the lifters too? Mild Build Gt40p OR you could put your automotive journalistic skills in motion by reporting on the many new modern components available for the latest generation 351 Cleveland. Do you guys have part numbers for the spring kits? The later model distributors had a different diameter shaft than the earlier ones. Slover primarily focused on the exhaust side of the GT40P heads. could the gear of off the oil pump drive(i know they're DIS), for the explorer motor be used on his dizzy? 950.00 us a set and will ship . Let us explain. For this reason, we're not sure what kind of boost the GT-40P heads will give. I just read about this build on the corral.net. If you're not a header kind of guy, the repro 289 HIPO manifolds bolt up to the GT40P heads with plenty of spark plug room. According to his data and verified dyno tests with an EFI 302, you can go above this level if you port the stock, lower intake manifold, or upgrade it altogether. These are Ford iron GT-40P heads. Gt40/gt40p Heads On A 351w Questions - StangNet The valve seats have been cut on a . Scorpion 1.6 roller rockers. I've not seen a set of longtubes that have an issue with GT40P's, either. An aggressive cam will wake it up a bit. Yep my **** is coming apart again Isnt life great! - I have a 1989 f150 with a 302 5 spd. Like I said lots of options. A bit of info for those looking to build 300+hp 5.0L/302s The cost of a new set of standard replacement roller lifters is very affordable at major retailers like Summit. Start with any 302 block, but try to find one from 1985 and up since it will already have provisions for a roller camshaft. There are a lot of variables that must be addressed to give a better estimate, but a good basic estimate is 20-40 HP at the crank. Worst AFR 165 dyno ever | Factory Five Racing Forum I've got gt40p heads for it I'll be running, and can't afford better . The GT40P heads flow a lot better than stock 351 heads. I'm sure the dyno operator used some goofball correction factor to make the numbers look higher. Test 1: 750-cfm carburetor, dual-plane intake manifold, and stock camshaft. Just got through porting one of my gt40p heads today. Free shipping. 97% Positive Feedback . PTP Engineering front suspension and 25540R17s all around. Take the assembly to a machine shop to have it balanced and install it in the block. 1983 Mustang G.T. This modification will help your late-model GT40P heads work better with the old-school carbureted intake setup. We didn't increase the valve size, although we did have to add Manley valves to get the proper spring-installed height. Actually, making around 240 to 250 hp with a near-stock Windsor 302 will feel pretty good. Build Thread 1965 Fastback Project "Racesteed". GT40P heads, what kind of performance do they give? The older pushrod engines just dont offer the same kind of power potential for their displacement and it all has to do with cylinder head flow. There was an article in Hot Rod magazine in the mid '80's where Jon Kaase was developing 351w packages. This needs to be removed and different exhaust valves, retainers, and valve springs added to turn this into a decent street head. These are some of the pictures I have showing the Explorer manifolds. Works on all factory cast iron E7, GT40, and GT40P cylinder heads! +1 I would go with the regular GT40 heads. You will have to address the 50 oz balance of the 5.0 engine by getting a 50 oz flywheel. $930.00 + $55.00 shipping. Definitely going to use my P heads. 99 Explorer engine (302) with GT40P heads - Ford Muscle Cars Tech Forum GT40P heads, 302 and Victor Jr. intake: - Factory Five Racing Forum never messed with the timing, its at 35* total . 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. If you dont feel comfortable doing this higher a pro. 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'm running BBK un-equal length shorty's, and I'm able to get all the plugs in, tight, and all plug wires on. Its funny no one mentioned anything about ignition timing or components, Your email address will not be published. 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. Richard Holdener 240K subscribers Subscribe 63K views 1 year ago WESTECH PERFORMANCE GROUP LOW BUCK, GT40P 5.0L HEADS-CHEAP &. The engine was only rated at 215 hp, but it at least had 9.0:1 compression. On the power side, we selected 400 hp as an impressive but reasonable output for our small-block 5.0L Ford. You'll have to plug the oil hole that is in the engine from the old oil dipstick. Keep in mind that swapping camshafts is a fairly extensive effort. hole size 302 is 7/16 and 351 is 1/2 We set the timing to 34 degrees and rejetted the carburetor to get our desired 12.5:1 air/fuel ratio. 87-93-95 Ford Mustang GT40P Engine Cylinder Heads REBUILT 302 351 GT40 As with Chevrolet's small-block engine, the aftermarket has had dozens of years to expand the range and reduce the cost of the parts they offer for this engine. LOW-BUCK 302 FORD HEAD UPGRADE - YouTube While the heads were off getting a massage, we turned our attention to the cam timing. There are a couple of reasons for this suggestion. I have a 302 Windsor V8 EFI engine that I converted to a 600 cfm carburetor with a Street Warrior intake manifold. 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. Every thing he tells you on this site is true. Features hardened 4140 Chromoly retainers, valve locks, spring shims, a spring height gauge, valve seals, and instructions. The fix: basic power upgrades for a sluggish 302 thats after 3 hours of idling/midrange hits to tune the idle and part throttle . . Mac and Ford Motorsport both make a GT40P spacific header. Keywords The MPH was there to run a little better but the local track is about terrible. Nudge us with emails, and we'll make it happen. I got lucky and found a complete Explorer GT40P engine online. Come join the discussion about popular models such as the Mustang, Galaxie, Falcon, Fairlane, Torino, Shelby and many more! the springs are new stock oem ford. Stock valve sizes? JavaScript is disabled. 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. Compare. REMANUFACTURED FORD 302 5.0 COBRA GT40 CYLINDER HEADS | What's New
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