A bone stock 2bbl early 351w with stock replacement forged pistons (9.0 compression) and dyno headers made 211 Hp . While the heads were off getting a massage, we turned our attention to the cam timing. 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. United Engine and Machine sells cheap but decent pistons that will do what you're wanting. 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. You need to check. I have a very good running stock 1981 302 in a F100 short box. 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. Then why did you port the heads and how do you know if you made an improvement. We guarantee plenty of burnout action when you add GT-40P heads to your 5.0 Mustang. There are caveats to this plan, however. 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. Boy, were we surprised with the results. Note the head bolt hole issue, some GT40 iron heads had 1/2 holes, if not they will need to be enlarged. Sponsored. Come join the discussion about popular models such as the Mustang, Galaxie, Falcon, Fairlane, Torino, Shelby and many more! I'm wondering how these heads will interact with the paxton 1220 sl supercharger I'm trying to put on. If we subtract the 20 hp that the fan is worth, we end up with a gain of 25 hp. I have to agree, the GT40P heads flow better than the GT40 iron heads. Best of all, no machining is required to install these on your stock cast iron heads! A LOT of them do it these days. Every thing he tells you on this site is true. 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. 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. (Please note these are not GT40P Explorer heads). VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. MAC is the only manufacturer of these headers, and the parts we installed fit like a glove with no problems whatsoever. 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. We also added a veteran Ford magnetic pickup distributor and used it to drive an MSD ignition system. These are a great head but do need some machining mods to make they really work well. I spin it to 6500 and thats about it. Not bad for off the shelf parts and a stock shortblock. i'd love to use these heads,. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. They almost seem like flywheel numbers rather than RWHP numbers. Let us explain. That's a good combo in my book. These are Ford iron GT-40P heads. E303 Cam advanced 4 degrees. Small Block V8 (221, 260, 289, 5.0/302, 5.8/351W) - GT40P heads? Because its all been done time after time after. You didnt mention the car this engine is in, but lets assume there is enough room to remove the radiator and any other coolers and perhaps some or all of the front grille and/or brackets before the cam has sufficient room to exit the front of the engine. Click to reveal 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. With no other changes we gained 25 hp using factory iron heads. Free shipping for many products! And have discovered something that I dont think anyone else knows. This website is using a security service to protect itself from online attacks. This is just a quick overview of the changes that need to be done. Anythoughts? The GT40 & GT40P heads had a few differences that are note-worthy, the most importantly being the bump in compression. HAD '82 GT monochromatic (red).black cloth HAVE This will keep you from dropping your overall static compression ratio and losing power. 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. Ford's seminal 302 engine (later re-dubbed the 5.0) has been popular with budget-minded hot rodders for decades. However realistically, with the amount of money spent modifying the gt40p heads or even those older 289 & 351w heads, you could have even better performing aluminum heads. I bought a crate 302 from Downs Ford a few years ago that was producing 320 hp. Just make sure it is a roller cam. This is the main reason why these engines are not modified as much as the small block Chevy. Ill do springs and a moderate cam and go for a good, dependable power plant. 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! But dont think that adding a bigger camshaft will make more power. The Edelbrock Performer RPM is a good choice, but Holley, Weiand and Ford Motorsport also have similar offerings. Is asking advice for a fairly common situation involving parts with mandatory compatibility between the two for performance and longevity. 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. This combination should be good for about 400 horsepower and as much as 500 if you opt to use the stronger aftermarket pistons. Both have very similar valve sizes, but the GT40P head has slightly larger combustion chambers for a small bump in compression and better flow. You can use the stock roller lifters with any size cam you want. Purchase any used aftermarket manifold for the 302 that is designed to function in the 3,500 to 6,500 power band. A good port job can set you back another $500-$1,000. We gained 45 hp and 40 lb-ft of torque. 02-11-2012, 07:16 PM #6 fiveoh 86lx Slover primarily focused on the exhaust side of the GT40P heads. I'll prob take a trip up there this weekend after scavenging the junkyards, thanks a million. The newer camshaft is designed for use with a soft bronze distributor gear, not the hardened steel gear used for older camshafts. Aftermarket headers, such as those made by Hooker, BBK and Competition Engineering, are better and are just as easy, if somewhat more expensive, to procure used. I have a 5.0 from a 1992 Mustang in my 65. It's an 86 roller 5.0 engine that had a recent rebuild sometime in the past with keith black pistons, otherwise stock. You can have your current 28 oz rebalanced to 50. These are among the best of the iron Ford Windsor heads as they tend to flow much better than earlier castings. There are too many variables to add to this regarding aftermarket stroker kits or components. Joined . You keep stock drivability, and stock gas milage if you can stay out of boost. Install a set of 1.7:1 roller-tipped rocker arms on the heads. Yeah, except those. a) ain't early and b) aren't 289 heads. If you go with a diffrent cam, make sure you change springs, The Trick Flow kit comes with everything for around $130. 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. Build Thread 1965 Fastback Project "Racesteed". hole size 302 is 7/16 and 351 is 1/2 He'd be the best source. The headers will improve this airflow throughout the entire rpm rangeadding more torque and horsepower. I have been working on Fords for 40 years and I have experimented with a few tricks of my own. 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. The multiple-layer steel construction allows the gasket to conform to movement between the cylinder head and block while maintaining a good seal. Stock valve sizes? They work, but present their own challenges. bmcdaniel, Feb 17, 2004 #7. v8maverick Member. This modification will help your late-model GT40P heads work better with the old-school carbureted intake setup. Advanced: Daily Deals; Help & Contact; Sell; My eBay Expand My . We heated the bottle to 950 psi and hit the button at 4,500 rpm. . On slicks the car went some low 7.70s right at 90mph. The 302 uses smaller 7/16" head bolts and your "P" heads may or may not require the step washers. Always the weak area in the 289 and 302 is the tiny 5/16 inch connecting rod bolts and the miniscule intake and exhaust ports. You'll also have to use your 289 timing chain cover since it has a hole for the oil dip stick and fuel pump. So . Ported Hurricane Single Plane and custom 750 HP. This is an older thread, you may not receive a response, and could be reviving an old thread. It has underdrive pulleys, MSD ignition, Bassanni headers and forward exit exhaust. 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. A solid 300-325 hp should be plenty and that's with good drivability and reliability 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. Where they differ is the combustion chamber size. And agree the cams do help and a few tricks with the heads that I have discovered really make a difference. These are some of the best castings Ford ever produced for this engine, and are still fairly cheap and available used. However I think the opportunity window is slowly closing. This one added another 10 degrees of duration over the smaller Voodoo cam, along with 0.020 inch more intake valve lift. 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. I am working on a set of iron GT40s hoping it goes faster. The spark plug issue is almost a non-issue. 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. After we installed the heads and with the fan off, he ran a 12.46 at 107.9. You will have to get special headers to fit these heads since the spark plugs are angled differently than normal 5.0 heads. Their weak point is that the rotator used on the exhaust valve is very thick. A COMP hydraulic roller cam we found works well with this combination. The tube headers showed a gain of almost 100 hp! Holten tells us removing the fan is worth two-tenths in itself, which tells us the fan soaks up roughly 20 hp. Test 2: Changed to the smaller of the two Lunati camshaftsno other changes. 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. (its not their engine) 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. In mid-1997, the Explorer and Mountaineer 5.0 L heads were revised and renamed . 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. If you can get the mentioned GT-40 heads with studs for a good price, that would be good for you. Well also assume that this engine is running stock exhaust manifolds. 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). Building a 302-inch small-block to produce 400 hp is really no big deal, but doing. The Fora platform includes forum software by XenForo. With nitrous, this is easily a mid-11-second ride. Also, you'll need to get a steel distributor gear to replace the iron gear that is currently on your distributor. Not looking for crazy HP. We did the installation at Holten's place of employment, Motorworks, in Longwood, Florida. For real performance, stock E7TE heads leave a lot to be desired. And remember ENGINES have been being built/rebuilt/modified for years. The Fora platform includes forum software by XenForo. Install a "wet" nitrous plate system (which carries both nitrous and fuel) onto the intake manifold and jet it conservatively for a 100 horsepower shot. 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. 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. If you wanted to make your engine feel strong, these would be a decent investment, but they will require some modifications. 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. ***Most important is theStupid question is the one that was never asked!*** the springs are new stock oem ford. 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. This kind of improvement may not seem like much, but the owner of our test car, Jamie Holten, runs in FFW Trophy Stock where three-tenths is a lifetime. Ive been building ENGINES for 40+ years. 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. 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. Posted on May 07, 2014 by promarengine. If I get different urges later, Ill pursue those then. The MPH was there to run a little better but the local track is about terrible. Not sure about that but got some pictures of the cast iron explorer manifolds on a 302. Headers and a camshaft will help but the engine really needs aftermarket 3/8 inch connecting rod bolts and aftermarket cylinder heads. 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. I added a link to it. This needs to be removed and different exhaust valves, retainers, and valve springs added to turn this into a decent street head. Going from your heads to the GT40p heads will bump your compression by about a point.so hello bottom end torque. I have a 432 HP non Hi Po 289 I built. For the first test, we were reusing the stock Explorer cam, so the engine didn't need any break-in time. That's more than enough to feed a power-brake booster. This is not a criticism but instead consider it to be more of a heads-up. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. This engine will be good for your 65 Mustang. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); This site uses Akismet to reduce spam. 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. Eldelbrocks Air Gap intake manifold should work well with the combination. We compare the GT40s to modern cylinder heads as well as other heads from the era. $700.98. Nice to see actual dyno results instead of "butt dyno" guesses. Choose a cylinder head before you install the pistons. Dennis Hilliard of Central Coast says we can expect to gain three-tenths in the quarter-mile. (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. I've not seen a set of longtubes that have an issue with GT40P's, either. 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. Works on all factory cast iron E7, GT40, and GT40P cylinder heads! Different years can have different combustion chamber sizes but ffor the most part there will be no performance increases by going with 302 heads. Like I said lots of options. A forum community dedicated to Ford performance owners and enthusiasts. 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. GT40s have 64cc chambers. Hey all, I'm working on building a 302 with my gt40p heads. If you can find individual flanged headers like the obsolete MAC headers had, those worked really well with GT40P's. #3::: Do your homework,get quality parts,dont skimp. GT40, GT40P, would be great factory heads. SBF FORD Aluminum Cylinder Heads 302 /351w 190cc 62cc 2.02 /1.60 For ROLLER CAM. $169.50. The car weighs #2835 with driver. Runs well. 950.00 us a set and will ship . After a couple grand you have a killer set of heads, but there's got to be a less-expensive way of making horsepower. P-heads have a smaller combustion chamber at 59cc, which will bump the compression ratio up on an otherwise-stock 5.0 engine. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. fordfan289, Aug 27, 2011 Stock 1989 5.0L HO pistons will work if you can find them. Those heads were unported and had stock valve sizes! 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'd get the gt40 setup, and put an s trim on it. A mild porting with gasket matching will be very good. check out the. Theres many options available for a little more power. Now we know why Dennis Hilliard of Central Coast Mustang is so high on these heads. check out the. the engine is carburated of that makes a difference. GT 500; Posts: 8496; Location: Brisbane . 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. Never not once have I ever seen a SBF rod bolt create a failure. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. If you're running a stock cam, 1.7 rockers will work perfectly. Here is my setup. 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. 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). The GT40P heads flow a lot better than stock 351 heads. 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. Not sure how they would mate up to your existing exhuast, but otherwise they should work. JUNKYARD GT40P HEADS-ADD 30+ HP TO YOUR 5.0L (FOR FREE?) 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. But the part about a cam replacement possibly being a labor intensive undertaking is correct. Even with a stock Mustang 5.0 cam makes good power. Required fields are marked *. Yeah, out of a bolt on upgrade, you'd probably be looking at 260-280rwhp ish with supporting mods. All this is worth it. Free shipping. He has worked as a tractor-trailer driver and mechanic, a rigger at a fire engine factory and as a race-car driver and builder. We also added an Edelbrock Performer RPM dual-plane intake and a set of 158-inch headers with no mufflers. Beyond the engine's amazingly good appearance, Moore had a couple of good reasons for choosing this engine. A forum community dedicated to Ford Mustang owners and enthusiasts. You didnt mention which cam you had in mind. FORD GT40p 4 BAR HEADS IN GOOD CONDITION . With the engine reassembled, we boxed up our second camshaft and headed for Westech's dyno. never messed with the timing, its at 35* total . This will cost additional money but is still worth it, in our opinion. Ford Factory 5.0 Performance Cylinder Heads. The "P" heads flow better. 302 .030 over with; Scat Forged Steel Rods, SpeedPro pistons and rings . Many years ago, a friend bought a used 2001 Mercury Mountaineer 5.0L that was equipped with a set of really decent GT40P style iron heads. No-option stripper- I like strippers. (Image/Harrison Creamery). Can anyone give me a little feedback about a '99 Explorer 5.0, and tell me if it's my answer. Very true about finding them at the local yards. http://vb.foureyedpride.com/showthread.php?t=89153, http://www.facebook.com/groups/233213650060739/, ascMcLaren & Motorsport/Grand Prix IV Capris, RHD and Other International/Export Models, Mods, Maintenance & Mechanical FAQs/Archive, If this is your first visit, be sure to This test went so well that we were eager to see what the slightly bigger cam would do. Step 1. 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. With. 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. Please include what you were doing when this page came up and the Cloudflare Ray ID found at the bottom of this page. Don't let the fact that the iron GT40 heads have a larger exhaust valve fool you. 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. Maybe I'll think about a cam swap? I guess someone could just do a basic valve job and throw on the GT40 upper/lower intake for a cheap HP boost. There are literally a dozen or so camshaft companies that offer a mild hydraulic roller cam for a 5.0L Ford. The heads that were used were also old C8 casting with 58cc chambers. 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. We didn't increase the valve size, although we did have to add Manley valves to get the proper spring-installed height. Assuming this will be a daily driver engine, a short duration camshaft, especially when combined with a four-barrel dual plane intake manifold and headers, will deliver extremely snappy throttle response and the whole combination will increase the torque and peak horsepower by somewhere in the neighborhood of 20 to perhaps 35 horsepower. In 1987, he assumed the role of editor for Hot Rod magazine before returning to his first love of writing technical stories. I can tell you that with my 9.503 block, 22cc dished pistons and 64cc heads, I'm at 9.5:1 compression. 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. Come join the discussion about performance, production numbers, VIN decoders, modifications, troubleshooting, power adders, DIY tutorials, and more! Learn how your comment data is processed. I was thinking the same but the enforcers are $647ea now so $1400 (inc tax) is the entry price for good set of heads. We started with a 120,000-mile 5.0L out of a Ford Explorer, removed the EFI and DIS, and pocket ported the stock GT40P iron heads with stock valve sizes. Not *as* good as the GT40p heads, but I'd prefer to not have to worry about exhaust fitment issues, or have a narrow range of what I can work with. With the P-heads requiring pedestal-mount rockers, we also called up Crane Cams for a set of 1.6 pedestal-mount roller rockers. i've got a short block started, and i recently came across a set of GT40P heads for FREE ( love family members). In less than an hour, we were ready to test. JavaScript is disabled. Holley 670 street avenger carb. This is needed for the steel roller cam. So I've got the motor and heads already for my maverick project. The combination of this cam with your intake and headers will produce a very nice street engine. 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. Features hardened 4140 Chromoly retainers, valve locks, spring shims, a spring height gauge, valve seals, and instructions. I am very happy too. 402 HP NA from a HI PO 289 isnt that mysterious of a feat to accomplish with todays SBF Aftermarket parts availability. Save narve00 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. If this is beyond your technical ability, you could ask a local machine shop to perform the modifications. When building an engine there is a lot to take into consideration. 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.
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