Weiand 7515 xcellerator intake. The best thing to do would be to use a specific break-in oil for the first 200 to 300 miles of use to reduce the change of a potential problem with undue wear. Gasoline/Diesel all makes on earth & still doing it today with great pride.Feel free to contact me anytime. Test 3: Installed the larger Lunati camagain, no other changes. For a better experience, please enable JavaScript in your browser before proceeding. The only way to really make more power is to go with a stroker kit, blower and/or heads. We need a build on a 400+ hp 302/6 build. 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. 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. #1:::Throw out all your Magazines that suggest what to do! 331/347 stroker w/gt40p's, waste?Hp?cost involved? - Maverick Perhaps even more surprising was how well this engine idled, calmly purring with 16 inches of manifold vacuum at 980 rpm. I got lucky and found a complete Explorer GT40P engine online. 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. Car Craft mag. How to Build a Cheap Drag Racing 302 Ford Motor | It Still Runs How to Build a Budget 383 Stroker Chevy How do I Increase Horsepower on a 440 Cylinder Head Specifications for a 1969 How to Get More Power Out of a 92 4.3 dragster engine image by Robert Young from, Copyright 2023 Leaf Group Ltd. / Leaf Group Media. We also added an Edelbrock Performer RPM dual-plane intake and a set of 158-inch headers with no mufflers. 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. I guess someone could just do a basic valve job and throw on the GT40 upper/lower intake for a cheap HP boost. In addition, the cam timing was designed for torque, with duration somewhere around 190 degrees at 0.050 with roughly 0.450-inch lift. Start with any 302 block, but try to find one from 1985 and up since it will already have provisions for a roller camshaft. Manual trans. The kit offers adjustable power from 50 to 250 hp with a simple jet change. Come join the discussion about restoration, modifications, NOS parts, troubleshooting, VIN codes, and more! I got lucky and found a complete Explorer GT40P engine online. I bought a crate 302 from Downs Ford a few years ago that was producing 320 hp. Step 2. For both the GT40 and GT40p heads, I STRONGLY suggest upgrading the valve springs. Cant wait to try um out. I am very happy too. Im running stock GT40 heads with stock 4.000 bore on cylinders and a Lunati cam with 256/262; Duration @ .050 (Int/Exh): 213/219; Gross Valve Lift (Int/Exh): .483/.499; LSA/ICL: 112/108. They were located in Tahachapi CA, and were sold with upgraded springs for $650.00, back in 2002-2003 ish. .. i would not buy valves unless you need them amd would not switch to studs with these heads for your low hp . After graduating from Iowa State University with a journalism degree in 1978, he combined his two passions: cars and writing. E303 Cam advanced 4 degrees. 302, GT40P Heads, E cam, 4 into 4, Holley 600, Mallory Unilite, Levy SD T5, 3.73, 15" Team III, firewall mod, trunk mod, trailer hitch, drivers foot box mod, front tow rings. The 302 uses smaller 7/16" head bolts and your "P" heads may or may not require the step washers. Supercharging GT40p heads | Modded Mustang Forums A mild porting with gasket matching will be very good. Really hurt too. Depends on the budget. 1 - 7 of 7 Posts. Mustang Cylinder Head & Camshaft Guide (79-95) - LMR Thank You. Related Resources Mustang Generation Nicknames: What Do They Mean? Where they differ is the combustion chamber size. Win or lose, if you buy the ticket you must take the ride. 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. #3::: Do your homework,get quality parts,dont skimp. They also have emissions legal heads as well. Similar to regular GT-40 heads, the biggest difference between the two is that the P-heads feature a revised spark plug angle which extends the plug into the combustion chamber, putting the flame front close to the absolute center of the chamber, resulting in a smoother combustion process. The car weighs #2835 with driver. Generally expect with a good cam, intake, roller rockers and a good ignition system to see around 300-350 max rear wheel horsepower, depending on what type of dyno you use. Best of all, no machining is required to install these on your stock cast iron heads! I recall having an absolute blast with my old K-code coupe back in the day. Purchase a set of flat top pistons (from Ford Motorsport, TRW or Keith Black) with machined valve reliefs and designed to provide 10:1 compression with a 59 to 60 cc combustion chamber cylinder head. I've not seen a set of longtubes that have an issue with GT40P's, either. any input is apprecciated:smartass: Thank you for the info, if all I have to worry about is the plugs then I'm in good shape hahaha. Sure, you could race-port the existing E7 castings, which many have done, but then you're putting quite a bit of change into stock heads. If you smooth out the bowls and exhaust ports and gasket match the intakes they should flow decent. *** 65 Mustang 351C 4v, AOD, 4.11 gears *** 66 Galaxie convert big block. Be careful, I was once bitten by one of those reptile engine builders. The valve seats have been cut on a . Junkyard Gt40p Heads-add 30+ Hp to Your 5.0l (For Free?) Install a used set of 5.0L Mustang "shorty" headers, generally available at auto swap meets for a reasonable price. Building a 302-inch small-block to produce 400 hp is really no big deal, but doing. made more power everytwhere and 40 hp is respectable. Free shipping. I've got gt40p heads for it I'll be running, and can't afford better . Because its all been done time after time after. If I get different urges later, Ill pursue those then. Someone does make the Tri-Y's headers for the early Mustangs using the "P" heads. I got a set of AFR heads , night and day. GT40P heads, 302 and Victor Jr. intake: - Factory Five Racing Forum Took me 7 hours to do one head.but they cleaned up real nice. Boy, were we surprised with the results. The heads got a 3 angle valve job, new valves from speed-pro and all the valve train was from crane that matched the current hydraulic cam. The later model distributors had a different diameter shaft than the earlier ones. They work, but present their own challenges. this head fits years 95-01 explorer mountaineer mercury mountaineer . This will keep you from dropping your overall static compression ratio and losing power. 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. Ford GT40P 302 5.0L 4 Bar Cylinder Head Assembly Pair w/ 1/2" Head Bolt Hole. Even with a stock Mustang 5.0 cam makes good power. With the GT-40P heads you will need to back off the timing a couple degrees and bump up the fuel pressure. Holten's best time is a 12.63 at 105.9 mph, and if we gain the desired result he will be right in the thick of things in Trophy Stock competition. 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. FORD GT40p 4 BAR HEADS IN GOOD CONDITION . The HP DIFF column on the far right lists the horsepower difference between Test 1 and Test 3. The GT40P heads flow a lot better than stock 351 heads. As a matter of fact, Central Coast has an '89 coupe with GT-40P heads that has run a best of 11.98 in the quarter-mile. It has underdrive pulleys, MSD ignition, Bassanni headers and forward exit exhaust. All this is worth it. Pride is built, in your garage, with your two hands. Common sense would suggest that with the heavy lifting complete and the old cam removed, by not installing the new roller lifters along with the camshaft could be asking for the possibility of trouble just a few thousand miles down the road. AFR 165cc 58cc Heads. Gt40 heads/intake from a jy explorer, leave the . A trip to Orlando Speed World provided us with updated quarter-mile times. I was thinking the same but the enforcers are $647ea now so $1400 (inc tax) is the entry price for good set of heads. 68 Mustang GT/CS Highland Green, PS, PB & Console, C Code w/C4 & 3.55 8 rear, If you aren't using the GT40P's stock, with maybe a spring upgrade and valve job, they aren't worth it anymore. Nice to see actual dyno results instead of "butt dyno" guesses. I wouldnt recommend reusing lifters though. Pretty sure that was name, but I could be wrong. Budget 300HP 302 Build With. 97% Positive Feedback . 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. Most of them are aware of what changes need to be completed. But the part about a cam replacement possibly being a labor intensive undertaking is correct. We guarantee plenty of burnout action when you add GT-40P heads to your 5.0 Mustang. At 4,300 rpm, the torque peaked at 348 lb-ft, a solid 20-lb-ft improvement, and the Lunati continued to outperform the stock cam all the way through with a peak horsepower increase of 60 hp at 354 hp at 5,700 rpm! 302 with GT40 heads | Ford Mustang Forums Mar 23, 2004. I can tell you that with my 9.503 block, 22cc dished pistons and 64cc heads, I'm at 9.5:1 compression. 302 GT40 Dyno Results - FourEyedPride.com It runs smooth but seems lazy. These are a great head but do need some machining mods to make they really work well. I'm also have the regular GT40 heads on my current build. Jeff Smith: It would have been better to know a little bit more about your combination, but the short answer is yeswith a hydraulic roller camshaft, assuming the lifters are in good shape and the roller wheels show no unusual wear, they can be re-used on a new cam with no danger of adverse effects. These are some of the best castings Ford ever produced for this engine, and are still fairly cheap and available used. No-option stripper- I like strippers. You will have to address the 50 oz balance of the 5.0 engine by getting a 50 oz flywheel. Your IP: Ha! 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. i know a guy who used to build race engines so he has all the right tools, how much would it help to get the heads ported and polished or anything else he could do to them. timing and compression ratio with gt40p heads - Modded Mustang Forums You'll also have to use your 289 timing chain cover since it has a hole for the oil dip stick and fuel pump. For additional insurance, we also added a set of ARP head studs, which are stronger and offer better thread overlap than factory bolts, which helps prevent pulling threads out of a used block. There are several actions that could trigger this block including submitting a certain word or phrase, a SQL command or malformed data. These timeslips are from 1280' above sea level. Compare. The SUV indicated barely 120,000 on the clock, and after yanking the valve covers to judge the engine's condition, Tim Moore instantly made the decision to do the boneyard version of a smash-and-grab. At the dragstrip, we gained two-tenths and 2 mph. For the most part 302 heads and 351W heads are the same. 351W D0OE-C heads better than GT40P\'s? - Ford Muscle Cars Tech Forum 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. We are offering a pair of original Ford Cobra 5.0 GT40 cast iron cylinder heads. the springs are new stock oem ford. how much HP and torque? You will have to get special headers to fit these heads since the spark plugs are angled differently than normal 5.0 heads. He'd be the best source. As you might expect with more duration, the idle quality dropped significantly but was still able to make 11.5 inches of vacuum at 980 rpm. Both swaps made more sense when parts were readily available at the bone yard for cheap. Application Fits 1979-95 Mustang 302/351 w/ OEM Small Block Ford Heads Part of this reason is due to its inherent strength and simplicity, but a lot of it has to do with how little Ford has changed it over the years. i've got a short block started, and i recently came across a set of GT40P heads for FREE ( love family members). how hard to put on? Yep my **** is coming apart again Isnt life great! There are literally a dozen or so camshaft companies that offer a mild hydraulic roller cam for a 5.0L Ford. Early Windsors tend to have fairly restrictive exhaust manifolds, making the addition of a set of headers that much more efficient. Once you get into the FoMoCo aftermarket aluminum GT40s though, all bets are off. 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). There was an article in Hot Rod magazine in the mid '80's where Jon Kaase was developing 351w packages. The GT40P cylinder heads had a small combustion chamber ranging from 58-61cc while the GT40 heads had a 63-66cc combustion chamber. 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. These heads have been remanufactured using refaced reclaimed Factory Valves. I used Lightning heads on my 302, (GT40 not P) with stock rockers on a flat tappet engine. Good on ya Jeff Smith. Central Coast Mustang sells GT-40P heads at a great price, making them a viable alternative in a market flooded with performance head choices. FULL DYNO RESULTS. Commonly referred to as Explorer heads, GT-40P iron castings are found on current 5.0-equipped Explorers. Plus you will need to drill all the head bolt holes out as the 351W uses larger head bolts. Finding Gt40p heads at the junkyard is getting more and more complicated and if you want to upgrade the heads you have to take into account the costs of the machine shop and compare everything to a set of cheap aluminum heads. What Cam and Springs to Use for GT40 Heads The Fora platform includes forum software by XenForo. Upgrading Fox Body Cylinder Heads - AmericanMuscle.com They suffered from poor aftermarket support up until about 15 years ago when it really came on strong.