I just read about this build on the corral.net. It took him and yours truly eight hours from start to finish, using air tools and a lift to gain access to the header flanges. I've not seen a set of longtubes that have an issue with GT40P's, either. Different years can have different combustion chamber sizes but ffor the most part there will be no performance increases by going with 302 heads. (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. 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. i'd love to use these heads,. MAC is the only manufacturer of these headers, and the parts we installed fit like a glove with no problems whatsoever. Its always refreshing to see a FORD getting a little face time in your column, even if its a tired 302 with no great expectations of setting the world on fire when the dust settles. LOW-BUCK 302 FORD HEAD UPGRADE - YouTube The hardest part of swapping the cam was just getting the timing cover off and back on again. If you smooth out the bowls and exhaust ports and gasket match the intakes they should flow decent. Instructions on porting the GT-40p heads here. Gt40/gt40p Heads On A 351w Questions - StangNet He'll have to get a gear for his distributor. We are offering a pair of original Ford Cobra 5.0 GT40 cast iron cylinder heads. 1 - 7 of 7 Posts. Go for it if you get them super cheap and can get headers/manifolds super cheap as well but otherwise I'd say it's a waste of time and money. AFR 165 Heads | Have options for pedestal mounted rocker arms or stud mounted rocker arms. Because of this, your tuneup will probably need to be modified. Calculated compression to 9.8:1. 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. Its funny no one mentioned anything about ignition timing or components, Your email address will not be published. These are Ford iron GT-40P heads. 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. You can have your current 28 oz rebalanced to 50. For both the GT40 and GT40p heads, I STRONGLY suggest upgrading the valve springs. Car Craft mag. 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. Test 3: Installed the larger Lunati camagain, no other changes. The Fora platform includes forum software by XenForo. I view the GT40P heads similar to Granada brakes. I got a GT40P off the assembly line years ago. They also have emissions legal heads as well. In less than an hour, we were ready to test. Some ideas never go out of style. Also, you'll need to get a steel distributor gear to replace the iron gear that is currently on your distributor. Everything fits, use the stock rockers and pushrods. Holley 670 street avenger carb. 68stang351 Founding Member May 16, 2002 850 Here a comparison of different heads on a 302: I'm very happy with my GT40P. 87-93-95 Ford Mustang GT40P Engine Cylinder Heads REBUILT 302 351 GT40 SBF OEM | eBay Motors, Parts & Accessories, Car & Truck Parts & Accessories | eBay! He'd be the best source. 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. Can anyone give me a little feedback about a '99 Explorer 5.0, and tell me if it's my answer. 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). this head fits years 95-01 explorer mountaineer mercury mountaineer . Here is my setup. Upgrading Fox Body Cylinder Heads - AmericanMuscle.com Or just play it safe and let the fans ask away about another daring 5.0 TB bolt on or for an exciting surprise, do a LS______ fill in the blanks. Junkyard Gt40p Heads-add 30+ Hp to Your 5.0l (For Free?) Posted on May 07, 2014 by promarengine. The engine never huffed oil out of the breathers, and the spark plugs all looked excellent. Someone does make the Tri-Y's headers for the early Mustangs using the "P" heads. 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. Boy, were we surprised with the results. GT40s have 64cc chambers. I had those on my car before I upgraded and they were nice heads. (Image/Harrison Creamery). Well also assume that this engine is running stock exhaust manifolds. 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. just curious. We gained 45 hp and 40 lb-ft of torque. 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. I got a set of AFR heads , night and day. 331/347 stroker w/gt40p's, waste?Hp?cost involved? - Maverick If you can get the mentioned GT-40 heads with studs for a good price, that would be good for you. Jeff Smith has had a passion for cars since he began working at his grandfather's gas station at the age 10. These are among the best of the iron Ford Windsor heads as they tend to flow much better than earlier castings. JavaScript is disabled. No-option stripper- I like strippers. The 302 uses smaller 7/16" head bolts and your "P" heads may or may not require the step washers. 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. The car weighs #2835 with driver. i have a question once i get the gt40p heads from the explorer truck can i also take the exhaust manifolds or headers and fit them in my 66 mustang:?:!?!?!? Central Coast Mustang sells GT-40P heads at a great price, making them a viable alternative in a market flooded with performance head choices. Actually, making around 240 to 250 hp with a near-stock Windsor 302 will feel pretty good. What Cam and Springs to Use for GT40 Heads I added a link to it. 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. LOW-BUCK 302 FORD HEAD UPGRADE Richard Holdener 239K subscribers 189K views 2 years ago WESTECH PERFORMANCE GROUP WHAT'S IT WORTH? Once you get into the FoMoCo aftermarket aluminum GT40s though, all bets are off. Install a set of 1.7:1 roller-tipped rocker arms on the heads. The newer camshaft is designed for use with a soft bronze distributor gear, not the hardened steel gear used for older camshafts. Im a different animal. You can email the site owner to let them know you were blocked. Calculating pushrod length 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. Overview. You keep stock drivability, and stock gas milage if you can stay out of boost. An aggressive cam will wake it up a bit. Ford 302W / 5.0L History & Specifications - The Ranger Station Im now thinking of adding a cam to match the carb. Mustang Cylinder Head & Camshaft Guide (79-95) - LMR Also, the spark plug angle makes it a pain. I don't need tons of power to enjoy the car. I have a very good running stock 1981 302 in a F100 short box. Not to mention, they will run circles around GT40P's out of the box. I was thinking the same but the enforcers are $647ea now so $1400 (inc tax) is the entry price for good set of heads. Those heads were unported and had stock valve sizes! At the time, I was still running smog equipment in a 1994 Mustang GT, so I had them drill the back of the heads for the thermactor connection. I must agree with Jeff Smith. K.S. While the heads were off getting a massage, we turned our attention to the cam timing. 1983 Mustang G.T. In addition, the cam timing was designed for torque, with duration somewhere around 190 degrees at 0.050 with roughly 0.450-inch lift. These are a great head but do need some machining mods to make they really work well. Hey all, I'm working on building a 302 with my gt40p heads. The "P" heads flow better. Well offer one as an example. What Are The GT40 & GT40P Heads? - LMR.com E303 Cam advanced 4 degrees. Build Thread 1965 Fastback Project "Racesteed". All Ford Mustangs | Model Specific Forums, GT-40P Heads - 5.0 Mustang & Super Fords Magazine. Check my post above. are you twisted331 also? We didn't increase the valve size, although we did have to add Manley valves to get the proper spring-installed height. Took me 7 hours to do one head.but they cleaned up real nice. We heated the bottle to 950 psi and hit the button at 4,500 rpm. 289 or 351 heads on a 302 advantage? | The H.A.M.B. Both swaps made more sense when parts were readily available at the bone yard for cheap. ***Most important is theStupid question is the one that was never asked!*** The only way to really make more power is to go with a stroker kit, blower and/or heads. Yank a motor out of the junkyard, clean it up, add a camshaft, intake, and a carburetor, and see how much power we can squeeze out of it. Ask Away! with Jeff Smith: Camshaft and Cylinder Head Recommendations Click to reveal The GT40P cylinder heads had a small combustion chamber ranging from 58-61cc while the GT40 heads had a 63-66cc combustion chamber. This is the main reason why these engines are not modified as much as the small block Chevy. PTP Engineering front suspension and 25540R17s all around. We did the installation at Holten's place of employment, Motorworks, in Longwood, Florida. You can find them on later model Mercury Mountaineers and several other Ford SUV applications. If you're going to use the stock 289 heads, install 1.84-inch intake valves, then port the intake and exhaust; these mods will net you about 185 cfm of intake port flow at 0.50 lift. Nice to see actual dyno results instead of "butt dyno" guesses. JavaScript is disabled. The only one that's close, is #7. 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. And have discovered something that I dont think anyone else knows. This is not a criticism but instead consider it to be more of a heads-up. Rowe studied engineering, philosophy and American literature at Central Florida Community College. 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! In 1987, he assumed the role of editor for Hot Rod magazine before returning to his first love of writing technical stories. 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. Your email address will not be published. However I think the opportunity window is slowly closing. They suffered from poor aftermarket support up until about 15 years ago when it really came on strong. Per a UEM tech support email I have the Icon IC736 is supposed to be good for GT40 heads when I asked about it. I used Lightning heads on my 302, (GT40 not P) with stock rockers on a flat tappet engine. 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.
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