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. All in all, the addition of GT-40P heads to any 5.0 Mustang is a worthwhile venture, especially if you're on a budget (aren't we all) or shooting for the Trophy Stock title. Here is the lowdown on exhaust manifolds and VALVE SPRINGS. 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. Long tube headers are a terrific idea, but you need to open up the exhaust side. that is a healthy budget deal. Then why did you port the heads and how do you know if you made an improvement. just curious. I love my setup and it is very strong engine. Ha! Slover primarily focused on the exhaust side of the GT40P heads. There are too many variables to add to this regarding aftermarket stroker kits or components. They work, but present their own challenges. The GT40 heads are a bit more versatile, working with the 5.4 and 6.8, while the GT40P (Explorer/Mountaineer) heads will only work on the 6.8 due to an interference issue. This will follow the guideline of a 1.6 rocker baseline and factory bottom end 79-95 related 5.0L Mustangs only. 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. Over $2050 for the 165/185 renegades. Scorpion 1.6 roller rockers. I've not seen a set of longtubes that have an issue with GT40P's, either. Good Luck. 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. 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. Joined: Sun Mar 15, 2009 9:31 am. Come join the discussion about performance, builds, modifications, reviews, engine swaps, classifieds, troubleshooting, maintenance, and more! Within a few hours of his discovery, the engine was sitting in the back of his truck on its way to a new home. If you're running a stock cam, 1.7 rockers will work perfectly. You can use the stock roller lifters with any size cam you want. Not to mention, they will run circles around GT40P's out of the box. Well also assume that this engine is running stock exhaust manifolds. This test went so well that we were eager to see what the slightly bigger cam would do. For both the GT40 and GT40p heads, I STRONGLY suggest upgrading the valve springs. Just make sure it is a roller cam. You can email the site owner to let them know you were blocked. 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. Compare. It turned out we were conservative on both counts. Instructions on porting the GT-40p heads here. #1:::Throw out all your Magazines that suggest what to do! Without changing the stock pistons. A COMP hydraulic roller cam we found works well with this combination. 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. We turned to Rare Auto Design in Orlando for dyno tests to find out how much horsepower we gained. 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. 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. thats after 3 hours of idling/midrange hits to tune the idle and part throttle . If you have a early 351W ie pre 76 it probably . HiPo manifolds and Ill be good. 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. T5z and 3.89 9" TL rear. The MPH was there to run a little better but the local track is about terrible. Location: Re: Stock Ford 351W 4bbl dyno numbers. You can find them on later model Mercury Mountaineers and several other Ford SUV applications. The only failures Ive had were timing chains and a couple broken rods in a mid 80s 302 with 200,000 miles on it that got about 35 lbs of boost stuffed into it when a pop off valve I bought on ebay failed. The only way to really make more power is to go with a stroker kit, blower and/or heads. I don't need tons of power to enjoy the car. I am working on a set of iron GT40s hoping it goes faster. For 2018, the Coyote makes 460 hp. But what we were most impressed with was the solid gain in torque over the smaller Voodoo cam from 3,500 and up. BONUS TEST-FOUR DIFFERENT 302 INTAKES.. For all of us interested in Gt40p heads. 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. Compare. Yea. If I get different urges later, Ill pursue those then. Cast iron GT40Ps as cast flow better than non-Ps due to revised plug location/angle. Yeah, out of a bolt on upgrade, you'd probably be looking at 260-280rwhp ish with supporting mods. Not sure about that but got some pictures of the cast iron explorer manifolds on a 302. 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. These are some of the pictures I have showing the Explorer manifolds. . Not when you can buy a set of Promaxx or AFR Enforcer heads for $1000, that already have decent hardware included. The combination of this cam with your intake and headers will produce a very nice street engine. ***Most important is theStupid question is the one that was never asked!*** So I've got the motor and heads already for my maverick project. Well that article just got me very ancy, I want these heads!! The GTp heads are like GT 40's with smaller combustion chambers and the spark plugs are relocated for a more efficient burn. You need to check. GT 500; Posts: 8496; Location: Brisbane . 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. For the cherry on top of this Blue Oval desert, we bolted Mike Thermos' simple Powerstar plate nitrous system under the carburetor, installed the 140-hp jets (55 fuel and 55 nitrous), and used the trigger to retard the timing on the MSD ignition by 8 degrees. An aggressive cam will wake it up a bit. Small Block Ford 289/302/5.0L/351w 180cc/60cc Aluminum Cylinder Head E42004. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. On the power side, we selected 400 hp as an impressive but reasonable output for our small-block 5.0L Ford. I'm also have the regular GT40 heads on my current build. The heads also required some machine work, including screw-in studs, guideplates, and widening the spring pockets for bigger valvesprings. It runs smooth but seems lazy. 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. The Edelbrock Performer RPM is a good choice, but Holley, Weiand and Ford Motorsport also have similar offerings. Would have liked to see a comparison done on the same short block using a set of decently-ported early non-Thermactor iron heads Tracy Blackford, 65 Mustang FB, 331 built with 289 H beam rods and 383W piston, 282S cam, self ported '70 351w heads, Dougs Tri-Y headers. We know what you're thinking--only two-tenths from an extra 45 hp? When combined with modern power-makers, such as nitrous, the 302 is more than capable of producing 400+ horsepower for little more than the cost of a stock engine rebuild. Be careful, I was once bitten by one of those reptile engine builders. This will cost additional money but is still worth it, in our opinion. Im now thinking of adding a cam to match the carb. You can have your current 28 oz rebalanced to 50. Well offer one as an example. Its NA but makes use of AFR heads and some other aftermarket goodies. Test 3: Installed the larger Lunati camagain, no other changes. This is not a criticism but instead consider it to be more of a heads-up. 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? 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. That's more than enough to feed a power-brake booster. Vehicle: 1972 2 door 302 maverick, 1986 5.0 stang gt convertible,66 mustang coupe, HEMI ram. Beyond the engine's amazingly good appearance, Moore had a couple of good reasons for choosing this engine. The action you just performed triggered the security solution. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. The gt40p head is considered the best OEM 302 head made. Dec 8, 2011. Also, the spark plug angle makes it a pain. For the first test, we were reusing the stock Explorer cam, so the engine didn't need any break-in time. You'll have to plug the oil hole that is in the engine from the old oil dipstick. P-heads have a smaller combustion chamber at 59cc, which will bump the compression ratio up on an otherwise-stock 5.0 engine. We've already been motivated to put this engine in a buddy's Mustang. I have a 432 HP non Hi Po 289 I built. Install a set of 1.7:1 roller-tipped rocker arms on the heads. fordfan289, Aug 27, 2011 I was thinking the same but the enforcers are $647ea now so $1400 (inc tax) is the entry price for good set of heads. Save narve00 I got rid of the carburetor and went with a F.A.S.T. That's a good combo in my book. Again, assuming this is a nearly stock 5.0L with stock heads, the Weiand Street Warrior dual plane intake and 600 cfm carburetor, its important to not become overly aggressive and choose a big camshaft. These heads have been remanufactured using refaced reclaimed Factory Valves. Along with the heads, we used MAC headers for GT-40P heads. 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. 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. The Fora platform includes forum software by XenForo. If they are cheap enough, take them anyway. Features hardened 4140 Chromoly retainers, valve locks, spring shims, a spring height gauge, valve seals, and instructions. 87-93-95 Ford Mustang GT40P Engine Cylinder Heads REBUILT 302 351 GT40 SBF OEM | eBay Motors, Parts & Accessories, Car & Truck Parts & Accessories | eBay! 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. In less than an hour, we were ready to test. I turned it because it was tired when I got it. If the head bolt holes are 1/2" or slightly larger, ARP makes the washers and can be sourced from Ford Racing or ARP through a speed shop or Summit, Jegs and PAW among others. In mid-1997, the Explorer and Mountaineer 5.0 L heads were revised and renamed . For those of you running a carb, or aftermarket intake, you already have a leg up in this area and should see even greater gains in power. We also added an Edelbrock Performer RPM dual-plane intake and a set of 158-inch headers with no mufflers. SB Ford GT40P Drop In Valve Springs Kit, Hyd Roller w/ Stock Cam, .450" lift and below. Not sure how they would mate up to your existing exhuast, but otherwise they should work. And agree the cams do help and a few tricks with the heads that I have discovered really make a difference. 69.90.139.244 Despite adding 30 degrees of intake duration, this cam improved torque throughout the entire test from 3,000 rpm on up. JavaScript is disabled. AFR 165cc 58cc Heads. hole size 302 is 7/16 and 351 is 1/2 United Engine and Machine sells cheap but decent pistons that will do what you're wanting. The GT40 heads have thermactor holes built in to connect to the EGR/smog equipment whereas the GT40P heads use an external EGR connective system. Gasoline/Diesel all makes on earth & still doing it today with great pride.Feel free to contact me anytime. Plus you will need to drill all the head bolt holes out as the 351W uses larger head bolts. They fill that spot between power and budget. Since 2003, Jeff has held various positions at Car Craft (including editor), has written books on small block Chevy performance, and even cultivated an impressive collection of 1965 and 1966 Chevelles. Im a different animal. Shop by category. He'll have to get a gear for his distributor. Actually, making around 240 to 250 hp with a near-stock Windsor 302 will feel pretty good. 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). 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. - I have a 1989 f150 with a 302 5 spd. The engine was only rated at 215 hp, but it at least had 9.0:1 compression. 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. The multiple-layer steel construction allows the gasket to conform to movement between the cylinder head and block while maintaining a good seal. 1.7 shaft rockers and beehives. The rest went very smoothly, and we reused the stock lifters and suffered no ulcers worrying about breaking in the cam. +1 I would go with the regular GT40 heads. With the tuning finalized, the little cam made far more power than we expected, cranking out 328 lb-ft of torque at 4,200 and 294 hp at 5,400 rpm. I have a 5.0 from a 1992 Mustang in my 65. 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. I just read about this build on the corral.net. check out the. With. It's an 86 roller 5.0 engine that had a recent rebuild sometime in the past with keith black pistons, otherwise stock. Nice to see actual dyno results instead of "butt dyno" guesses. The GT40 & GT40P heads had a few differences that are note-worthy, the most importantly being the bump in compression. I view the GT40P heads similar to Granada brakes.
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