68stang351 Founding Member May 16, 2002 850 We turned to Rare Auto Design in Orlando for dyno tests to find out how much horsepower we gained. Good Luck. 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. They suffered from poor aftermarket support up until about 15 years ago when it really came on strong. You will have to get special headers to fit these heads since the spark plugs are angled differently than normal 5.0 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. Free shipping for many products! It's a classic move we've pulled off many times. . Test 1: 750-cfm carburetor, dual-plane intake manifold, and stock camshaft. Holten runs the factory fan, but he had removed it when he ran the 12.63. SBF engines are modified constantly. You'll also have to use your 289 timing chain cover since it has a hole for the oil dip stick and fuel pump. We need a build on a 400+ hp 302/6 build. Yes- thank you. I love my setup and it is very strong engine. 87-93-95 Ford Mustang GT40P Engine Cylinder Heads REBUILT 302 351 GT40 SBF OEM | eBay Motors, Parts & Accessories, Car & Truck Parts & Accessories | eBay! When building an engine there is a lot to take into consideration. The '00 Ford Explorers and Mercury Moutaineers were factory equipped with one of Ford's better 5.0L motors. Come join the discussion about performance, production numbers, VIN decoders, modifications, troubleshooting, power adders, DIY tutorials, and more! 69-70 302 heads (the ones with the heart-shaped combustion chamber) Any early 289 heads for the chamber size (but you'll have small ports & valves w/all that CR) Flat Ernie, Aug 27, 2011 SHARE POST #8 fordfan289 Member from indiana correct me if Im wrong but cant you use 351c heads and get the same thing as a 302 boss. 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. Nice to see actual dyno results instead of "butt dyno" guesses. are you twisted331 also? Maybe I'll think about a cam swap? We will go into more detail on the head mods in a later story in Junkyard Builder, so watch for it. Anyways, I know the gt40ps will bump . The GT40 & GT40P heads had a few differences that are note-worthy, the most importantly being the bump in compression. ford 302 sbf gt40p v8 cast iron complete cylinder head and head bolts and head gasket set. I'm using the Trick Flow stage 1 cam with 1.7 roller rockers. Well also assume that this engine is running stock exhaust manifolds. In 1987, he assumed the role of editor for Hot Rod magazine before returning to his first love of writing technical stories. Smith began writing for Car Craft magazine in 1979 and became editor in 1984. Yes Mr.Smith, your column here at OAC adorned with extreme performance without power adders, or all Engine as its known, from a superior pushrod Small Block featuring almost all USA sourced modern components with the familiar smell of Ford Blue. After a couple grand you have a killer set of heads, but there's got to be a less-expensive way of making horsepower. This website is using a security service to protect itself from online attacks. This 1979-1995 Mustang cylinder head and camshaft guide will overview the heads and cams we offer and how they will coincide. They work, but present their own challenges. Per a UEM tech support email I have the Icon IC736 is supposed to be good for GT40 heads when I asked about it. Sponsored. Keep in mind that swapping camshafts is a fairly extensive effort. If I get different urges later, Ill pursue those then. If you smooth out the bowls and exhaust ports and gasket match the intakes they should flow decent. A trip to Orlando Speed World provided us with updated quarter-mile times. A COMP hydraulic roller cam we found works well with this combination. 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. 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. You didnt mention which cam you had in mind. T5 with 3.73s. 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. I've not seen a set of longtubes that have an issue with GT40P's, either. FORD GT40p 4 BAR HEADS IN GOOD CONDITION . LOW-BUCK 302 FORD HEAD UPGRADE Richard Holdener 239K subscribers 189K views 2 years ago WESTECH PERFORMANCE GROUP WHAT'S IT WORTH? Going from your heads to the GT40p heads will bump your compression by about a point.so hello bottom end torque. With the engine reassembled, we boxed up our second camshaft and headed for Westech's dyno. These are some of the best castings Ford ever produced for this engine, and are still fairly cheap and available used. (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. A forum community dedicated to Ford performance owners and enthusiasts. Ive been building ENGINES for 40+ years. If we subtract the 20 hp that the fan is worth, we end up with a gain of 25 hp. Slover primarily focused on the exhaust side of the GT40P heads. Compare. However, since Holten's car has an E303 cam, we didn't want the pistons and valves becoming too close, so we chose the 1.6 rockers. No-option stripper- I like strippers. Compare. That's an improvement of 22 hp over Test 2. 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). You can use the stock roller lifters with any size cam you want. I have a very good running stock 1981 302 in a F100 short box. We gained 45 hp and 40 lb-ft of torque. But don't think that adding a bigger camshaft will make more power. Ive bought wrecking yard SBFs and put 20 lbs of boost to them and spin them to 7000 and made 500 HP with several of them. The MPH was there to run a little better but the local track is about terrible. 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 Rowe has been writing professionally since 2007, specializing in automotive topics. I was thinking the same but the enforcers are $647ea now so $1400 (inc tax) is the entry price for good set of heads. 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 only one that's close, is #7. If this is beyond your technical ability, you could ask a local machine shop to perform the modifications. For all of us interested in Gt40p heads. He'll have to get a gear for his distributor. Nudge us with emails, and we'll make it happen. BONUS TEST-FOUR DIFFERENT 302 INTAKES.. Your IP: - I have a 1989 f150 with a 302 5 spd. However there are plenty of factory heads that with the help of an experienced machine shop can be great. I'm sure the dyno operator used some goofball correction factor to make the numbers look higher. Let us explain. Buy the lifters for peace of mind now and hopefully for the duration. Really hurt too. Its increase while significant is still only about that of a decent 351 w, hi im building a nastalgic car so im not going to drag race it but it must go ok ive got a 302 windsor basicly recoed stock but i want to run tunnel rams to go with the the3am would like to put choppy cam and replace the heads any ideas would be much apprecited thankyou, What is the stock head cc of a 1992 f150 302 windsor. Shop by category. We did a quick search for hydraulic roller cams and landed on a COMP camshaft that looked promising. You can have your current 28 oz rebalanced to 50. It has underdrive pulleys, MSD ignition, Bassanni headers and forward exit exhaust. Since the engine is nearly stock, we would want to choose a relatively mild camshaft with somewhat more lift and duration than stock, but again not going too aggressive. The factory heads have a boss for the exhaust valve that restricts flow through the exhaust port. This pushed that little Ford to a peak horsepower of 503, and that was where we stopped. Headers and a camshaft will help but the engine really needs aftermarket 3/8 inch connecting rod bolts and aftermarket cylinder heads. 1 - 7 of 7 Posts. This is an older thread, you may not receive a response, and could be reviving an old thread. But what we were most impressed with was the solid gain in torque over the smaller Voodoo cam from 3,500 and up. However, theres a distinct possibility that I might pull all of my hair out if I see another in-depth article explaining how I, along with just over a billion other desperate humans seeking answers, need special valve spring split locks for my next tired Chevy build. Perhaps even more surprising was how well this engine idled, calmly purring with 16 inches of manifold vacuum at 980 rpm. However, when we dyno'd the car before installing the GT-40P heads, the fan was on the car. 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 engine never huffed oil out of the breathers, and the spark plugs all looked excellent. Best of all, no machining is required to install these on your stock cast iron heads! I was looking at putting on the GT40P heads on. 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. Eldelbrocks Air Gap intake manifold should work well with the combination. Test 3: Installed the larger Lunati camagain, no other changes. We've already been motivated to put this engine in a buddy's Mustang. 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. Adding the headers may also require a slight increase in secondary (and possibly primary) jetting to ensure the proper air-fuel ratio, but thats also an easy tuning change. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. And have discovered something that I dont think anyone else knows. 1979 Indy 500 Pace Car. As with all head installations, check piston-to-valve clearance before final startup. 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). I got a GT40P off the assembly line years ago. Even with relatively small valve sizes of 1.85-inch intake and 1.46-inch exhaust, the P-heads flow much better than previous. Gasoline/Diesel all makes on earth & still doing it today with great pride.Feel free to contact me anytime. Small Block V8 (221, 260, 289, 5.0/302, 5.8/351W) - anyone have experience with GT40P heads on a 92 351W - ive got a 92 F250 with a 351W that needs a pretty serious rebuild. (its not their engine) I view the GT40P heads similar to Granada brakes. The Fora platform includes forum software by XenForo. . You gave me the info I was looking for, and I really do appreciate it. I'm new and I'm 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. Like I said lots of options. Keywords Because its all been done time after time after. Everything fits, use the stock rockers and pushrods. 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. 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. JavaScript is disabled. 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 "P" heads flow better. What would be the best cam and springs to use for these heads in a 302 Windsor? Compare. 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. Required fields are marked *. Assorted screwdrivers, pliers and vise-grips. Come join the discussion about restoration, modifications, NOS parts, troubleshooting, VIN codes, and more! Motor is going into a Ranger. I added a link to it. No-option stripper- I like strippers. JavaScript is disabled. Install a set of 1.7:1 roller-tipped rocker arms on the heads. Well that article just got me very ancy, I want these heads!! 97% Positive Feedback . If they are cheap enough, take them anyway. You keep stock drivability, and stock gas milage if you can stay out of boost. Not when you can buy a set of Promaxx or AFR Enforcer heads for $1000, that already have decent hardware included. GT40s have 64cc chambers. I have been working on Fords for 40 years and I have experimented with a few tricks of my own. You will have to address the 50 oz balance of the 5.0 engine by getting a 50 oz flywheel. If I remember right, non of the GT40P's (later models) had the thermactor smog provisions. These are a great head but do need some machining mods to make they really work well. That's a good combo in my book. At the dragstrip, we gained two-tenths and 2 mph. 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. Install a Ford Motorsport E303, X303 or F303 cam, or any of the similar units from Indy, Lunati or your favorite manufacturer. Install a set of 1.7:1 roller-tipped rocker arms on the heads. I had a set of 69 302 heads I ran for a while . GT40p heads peak horsepower was [email protected] with 363ft/[email protected] The worked 351 heads showed peak . JavaScript is disabled. Tim's junkyard refugee survived the beating and we had a bitchin' story. If you can get the mentioned GT-40 heads with studs for a good price, that would be good for you. We know what you're thinking--only two-tenths from an extra 45 hp? fuel injection system . 02-11-2012, 07:16 PM #6 fiveoh 86lx The reason for this is that we're actually replacing mildly worked E7TE heads. This engine will be good for your 65 Mustang. Also, you'll need to get a steel distributor gear to replace the iron gear that is currently on your distributor. All this is worth it. I'm also have the regular GT40 heads on my current build. The rest went very smoothly, and we reused the stock lifters and suffered no ulcers worrying about breaking in the cam. While the heads were off getting a massage, we turned our attention to the cam timing. 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. +1 I would go with the regular GT40 heads. Assuming the above configurationa pushrod 5.0L will potentially make between 250 and 260 hp. Those are really good numbers. The gt40p head is considered the best OEM 302 head made. Actually, making around 240 to 250 hp with a near-stock Windsor 302 will feel pretty good. Do you guys have part numbers for the spring kits? SB Ford, GT40 .575" Lift Max Output II Drop in Valve Spring Kit, Hyd Roller, 140 Lb Seat. 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. Where they differ is the combustion chamber size. I have a 432 HP non Hi Po 289 I built. just curious. These are some of the best castings Ford ever produced for this engine, and are still fairly cheap and available used. Over $2050 for the 165/185 renegades. In an effort to preserve the history of the Early Fox Era, FEP covers the following vehicles: 79-86 Mustang and Capri, 84-86 Mustang SVO, 78-83 Fairmont & Zephyr, 83-86 LTD & Marquis, 80-88 Thunderbird & Cougar, 82-87 Continental, 84-92 Mark VII, 81-82 Granada. Good on ya Jeff Smith. The GT40P cylinder heads had a small combustion chamber ranging from 58-61cc while the GT40 heads had a 63-66cc combustion chamber. 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. The multiple-layer steel construction allows the gasket to conform to movement between the cylinder head and block while maintaining a good seal. 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. You need to check. You didnt mention what camshaft you would be choosing or exactly which 5.0L Ford Windsor engine you are working with. Runs well. 1983 Mustang G.T. Overview. The headers will improve this airflow throughout the entire rpm rangeadding more torque and horsepower. This will follow the guideline of a 1.6 rocker baseline and factory bottom end 79-95 related 5.0L Mustangs only. I went to a couple in Tucson and almost all the Ford vehicles that came with a 5.0 had the heads missing.