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. 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. 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). Overview. Along with the heads, we used MAC headers for GT-40P heads. Im now thinking of adding a cam to match the carb. The rest went very smoothly, and we reused the stock lifters and suffered no ulcers worrying about breaking in the cam. Learn how your comment data is processed. Check my post above. You will have to address the 50 oz balance of the 5.0 engine by getting a 50 oz flywheel. Shop by category. AFR 165 Heads | Have options for pedestal mounted rocker arms or stud mounted rocker arms. Yea. Stock heads with a fresh 3-angle valve job, shorty headers, T5, 4.10s, stock Explorer intake and stock '88 GT short block with 140,000 miles on it and an E cam in it. 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. For all of us interested in Gt40p heads. 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. If we subtract the 20 hp that the fan is worth, we end up with a gain of 25 hp. An aggressive cam will wake it up a bit. Note the head bolt hole issue, some GT40 iron heads had 1/2 holes, if not they will need to be enlarged. I spin it to 6500 and thats about it. Everything fits, use the stock rockers and pushrods. We were cruising the 'yard a while back and located a 2000 Ford Explorer with an EFI 5.0L V-8 engine. For a better experience, please enable JavaScript in your browser before proceeding. We heated the bottle to 950 psi and hit the button at 4,500 rpm. Gt40 heads/intake from a jy explorer, leave the . 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. So . For this reason, we're not sure what kind of boost the GT-40P heads will give. We also added an Edelbrock Performer RPM dual-plane intake and a set of 158-inch headers with no mufflers. Also, you'll need to get a steel distributor gear to replace the iron gear that is currently on your distributor. people can stop saying that adding aftermarket cam with stock heads is a waste of time. Someone does make the Tri-Y's headers for the early Mustangs using the "P" heads. Over $2050 for the 165/185 renegades. .. i would not buy valves unless you need them amd would not switch to studs with these heads for your low hp . These are some of the best castings Ford ever produced for this engine, and are still fairly cheap and available used. With the engine reassembled, we boxed up our second camshaft and headed for Westech's dyno. Dec 8, 2011. We gained 45 hp and 40 lb-ft of torque. MAC is the only manufacturer of these headers, and the parts we installed fit like a glove with no problems whatsoever. #3::: Do your homework,get quality parts,dont skimp. They were located in Tahachapi CA, and were sold with upgraded springs for $650.00, back in 2002-2003 ish. 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. Over $2050 for the 165/185 renegades. Because its all been done time after time after. Never not once have I ever seen a SBF rod bolt create a failure. Shop by category. There are caveats to this plan, however. Small Block V8 (221, 260, 289, 5.0/302, 5.8/351W) - GT40P heads? According to his data and verified dyno tests with an EFI 302, you can go above this level if you port the stock, lower intake manifold, or upgrade it altogether. Keep in mind that swapping camshafts is a fairly extensive effort. 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 only one that's close, is #7. 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. Free shipping. First, adding headers will improve power on the existing combination. Do you guys have part numbers for the spring kits? The GT40 & GT40P heads had a few differences that are note-worthy, the most importantly being the bump in compression. 1979 Indy 500 Pace Car. You can find them on later model Mercury Mountaineers and several other Ford SUV applications. The heads that were used were also old C8 casting with 58cc chambers. Those are really good numbers. We've already been motivated to put this engine in a buddy's Mustang. This one added another 10 degrees of duration over the smaller Voodoo cam, along with 0.020 inch more intake valve lift. Keywords We need a build on a 400+ hp 302/6 build. 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. bmcdaniel, Feb 17, 2004 #7. v8maverick Member. Anythoughts? 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. We turned to Rare Auto Design in Orlando for dyno tests to find out how much horsepower we gained. These are Ford iron GT-40P heads. Now we know why Dennis Hilliard of Central Coast Mustang is so high on these heads. For a better experience, please enable JavaScript in your browser before proceeding. 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. 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. 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. 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. 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. Even with relatively small valve sizes of 1.85-inch intake and 1.46-inch exhaust, the P-heads flow much better than previous. But what we were most impressed with was the solid gain in torque over the smaller Voodoo cam from 3,500 and up. . could the gear of off the oil pump drive(i know they're DIS), for the explorer motor be used on his dizzy? 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. We probably could have coaxed an even 300 hp out of this stock configuration, but with such good numbers, we decided to jump right into the first Lunati cam. Motor is going into a Ranger. Gasoline/Diesel all makes on earth & still doing it today with great pride.Feel free to contact me anytime. I have a 5.0 from a 1992 Mustang in my 65. Not looking for crazy HP. Good on ya Jeff Smith. In review, we rescued a used 5.0L Ford from the boneyard, ported the heads, added a cam, carburetor, intake manifold, and headers, and pulled an amazing 376 hp out of the mix. These are a great head but do need some machining mods to make they really work well. You can email the site owner to let them know you were blocked. Richard Holdener 240K subscribers Subscribe 63K views 1 year ago WESTECH PERFORMANCE GROUP LOW BUCK, GT40P 5.0L HEADS-CHEAP &. Im a different animal. That's an improvement of 22 hp over Test 2. The Edelbrock Performer RPM is a good choice, but Holley, Weiand and Ford Motorsport also have similar offerings. Like I said lots of options. These cast piston short-blocks are not quite as good as the forged piston 5.0L that came in Fox-body Mustangs, but the GT40P heads flow much better than earlier 5.0L heads. 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. They are more expensive than standard head gaskets, but they also do the job and are worth the additional money. Theres many options available for a little more power. 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. 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. Win or lose, if you buy the ticket you must take the ride. Instructions on porting the GT-40p heads here. Assorted screwdrivers, pliers and vise-grips. Both swaps made more sense when parts were readily available at the bone yard for cheap. Anyways, I know the gt40ps will bump . 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. the engine is carburated of that makes a difference. In less than an hour, we were ready to test. SB Ford GT40P Drop In Valve Springs Kit, Hyd Roller w/ Stock Cam, .450" lift and below. I can tell you that with my 9.503 block, 22cc dished pistons and 64cc heads, I'm at 9.5:1 compression. As usual, there is much more to this story. If you smooth out the bowls and exhaust ports and gasket match the intakes they should flow decent. I've got gt40p heads for it I'll be running, and can't afford better . This is a function of the somewhat wider lobe-separation angle of 112 degrees. 302 explorer short block with roughly 80k miles GT40's from a local u pull n pay ($97) weiand x-celerator trick flow stage 1 cam 650 holley double pumper car made 322/329 SAE . thats after 3 hours of idling/midrange hits to tune the idle and part throttle . A trip to Orlando Speed World provided us with updated quarter-mile times. Actually the regular gt40's in either aluminum or iron are the good ones but the gt40p's are only a slight improvement over regular 302 heads. This will cost additional money but is still worth it, in our opinion. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. Posted on May 07, 2014 by promarengine. fuel injection system . Holten tells us removing the fan is worth two-tenths in itself, which tells us the fan soaks up roughly 20 hp. Start with any 302 block, but try to find one from 1985 and up since it will already have provisions for a roller camshaft. I'm an old school guy (289 in 65 mustang), and I'm just looking into the new 5.0 engine (roller cam) stuff recently. 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. this head is complete with new 1.837 int valves and 1.536 exhaust valves. Works on all factory cast iron E7, GT40, and GT40P cylinder heads! They also have emissions legal heads as well. This 1979-1995 Mustang cylinder head and camshaft guide will overview the heads and cams we offer and how they will coincide. You didnt mention which cam you had in mind. Not bad for off the shelf parts and a stock shortblock. - I have a 1989 f150 with a 302 5 spd. Here is the lowdown on exhaust manifolds and VALVE SPRINGS. The 2 heads are about the same when looking at the numbers with the GT40p heads having a slight edge. I don't need tons of power to enjoy the car. Both have very similar valve sizes, but the GT40P head has slightly larger combustion chambers for a small bump in compression and better flow. Thanks. The kit offers adjustable power from 50 to 250 hp with a simple jet change. Yeah, out of a bolt on upgrade, you'd probably be looking at 260-280rwhp ish with supporting mods. E303 Cam advanced 4 degrees. Test 2: Changed to the smaller of the two Lunati camshaftsno other changes. This test went so well that we were eager to see what the slightly bigger cam would do. All Ford Mustangs | Model Specific Forums, GT-40P Heads - 5.0 Mustang & Super Fords Magazine. 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 entire front accessory drive and timing chain cover must be removed, along with the distributor and intake manifold. Runs well. 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. Ford's seminal 302 engine (later re-dubbed the 5.0) has been popular with budget-minded hot rodders for decades. I'd get the gt40 setup, and put an s trim on it. The Fora platform includes forum software by XenForo. 97% Positive Feedback . You'll also have to use your 289 timing chain cover since it has a hole for the oil dip stick and fuel pump. On the power side, we selected 400 hp as an impressive but reasonable output for our small-block 5.0L Ford. this is the price for one head. Nice to see actual dyno results instead of "butt dyno" guesses. There are a couple of reasons for this suggestion. Come join the discussion about performance, builds, modifications, reviews, engine swaps, classifieds, troubleshooting, maintenance, and more! 1 - 7 of 7 Posts. A LOT of them do it these days. 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. You'll have to plug the oil hole that is in the engine from the old oil dipstick. BONUS TEST-FOUR DIFFERENT 302 INTAKES.. I'll save the effort and lighten my front end by 50# with aluminum. I got lucky and found a complete Explorer GT40P engine online. That said there are some better aftermarket options for heads also. I would like to know what heads, cam and intake manifold combination to use for the most HP I can squeeze out of that motor. 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. Features hardened 4140 Chromoly retainers, valve locks, spring shims, a spring height gauge, valve seals, and instructions. The GT40P heads had a small combustion chamber ranging from 58-61cc while the GT40 heads had a 63-66cc combustion chamber. It has underdrive pulleys, MSD ignition, Bassanni headers and forward exit exhaust. There are literally a dozen or so camshaft companies that offer a mild hydraulic roller cam for a 5.0L Ford. I was looking at putting on the GT40P heads on. Do not ever, ever think about using the tube type manifolds. As with all head installations, check piston-to-valve clearance before final startup. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. 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). Free shipping for many products! Find many great new & used options and get the best deals for FORD GT40p 4 BAR HEADS IN GOOD CONDITION w/ONE BOLT BROKEN at the best online prices at eBay! These are some of the pictures I have showing the Explorer manifolds. Ported Hurricane Single Plane and custom 750 HP. Save narve00 1985 Mustang GT Mild 331 4bbl 5 spd, 1985 SEFI LTD LX AOD. Perhaps even more surprising was how well this engine idled, calmly purring with 16 inches of manifold vacuum at 980 rpm. The asterisk HP differences are calculated using Test 1's 294-hp peak. This engine will be good for your 65 Mustang. We guarantee plenty of burnout action when you add GT-40P heads to your 5.0 Mustang. So I've got the motor and heads already for my maverick project. This is an older thread, you may not receive a response, and could be reviving an old thread. Horse Sense: The smaller valves found in GT-40P heads improve airflow velocity. 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. 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. And have discovered something that I dont think anyone else knows. For the most part 302 heads and 351W heads are the same. Here a comparison of different heads on a 302: I'm very happy with my GT40P. That's more than enough to feed a power-brake booster. Obviously, tuneups will vary. Location: Re: Stock Ford 351W 4bbl dyno numbers. just curious. 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. Stock 93-95 Cobra shortblock (stock cobra cam), GT40X heads, 1.7 rockers, Edelbrock Performer RPM intake, Holley 650, and longtube headers. Performance & security by Cloudflare. Plus you will need to drill all the head bolt holes out as the 351W uses larger head bolts. $700.98. That's a 40 per cent increase in power from a simple head and cam swap, and one seriously happy Mustang owner! These engines came with the GT40P head, which even with its small valves, offers really good performance. 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. Is asking advice for a fairly common situation involving parts with mandatory compatibility between the two for performance and longevity. (Image/Harrison Creamery). With the GT-40P heads you will need to back off the timing a couple degrees and bump up the fuel pressure. The combination of this cam with your intake and headers will produce a very nice street engine. With. This is what I recommend to everyone who is doing a budget 5.0 build. hole size 302 is 7/16 and 351 is 1/2 I got a set of AFR heads , night and day. Related Resources Mustang Generation Nicknames: What Do They Mean? Free shipping. Calculating pushrod length There is a better way. This will keep you from dropping your overall static compression ratio and losing power. 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. The "P" heads flow better. Not when you can buy a set of Promaxx or AFR Enforcer heads for $1000, that already have decent hardware included. Vehicle: 1972 2 door 302 maverick, 1986 5.0 stang gt convertible,66 mustang coupe, HEMI ram. JUNKYARD GT40P HEADS-ADD 30+ HP TO YOUR 5.0L (FOR FREE?) 1.7 shaft rockers and beehives. 1985 Mustang GT Mild 331 4bbl 5 spd, 1985 SEFI LTD LX AOD. This is not a criticism but instead consider it to be more of a heads-up. No-option stripper- I like strippers. Smith began writing for Car Craft magazine in 1979 and became editor in 1984. That carbureted GT40P motor made 465 on th engine dyno with a .500" 239/244 camshaft, Holley 650 carb and Weiand Stealth intake. built one using a 91' HO short block with a set of AFR 165 heads, Weiand . are you twisted331 also? Where they differ is the combustion chamber size. If you're running a stock cam, 1.7 rockers will work perfectly. After graduating from Iowa State University with a journalism degree in 1978, he combined his two passions: cars and writing. 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. I just read about this build on the corral.net. Ford GT40P 302 5.0L 4 Bar Cylinder Head Assembly Pair w/ 1/2" Head Bolt Hole. Well also assume that this engine is running stock exhaust manifolds. A good port job can set you back another $500-$1,000. . $139.99. Required fields are marked *. Yep my **** is coming apart again Isnt life great! GT40Ps have 58cc. Let us explain. The spark plug issue is almost a non-issue. There's not a lot of reson to use 351 heads later than '75 since they essentially identical to 302 heads except for head bolt holes. Rowe studied engineering, philosophy and American literature at Central Florida Community College. Come join the discussion about restoration, modifications, NOS parts, troubleshooting, VIN codes, and more! The factory heads have a boss for the exhaust valve that restricts flow through the exhaust port. How much HP and torque do you think I. 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. That's fantastic for the minimal investment we made. Once you get into the FoMoCo aftermarket aluminum GT40s though, all bets are off. check out the. Purchase any used aftermarket manifold for the 302 that is designed to function in the 3,500 to 6,500 power band. #1:::Throw out all your Magazines that suggest what to do! Every thing he tells you on this site is true. 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. The older pushrod engines just dont offer the same kind of power potential for their displacement and it all has to do with cylinder head flow.
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