Shop by category. They almost seem like flywheel numbers rather than RWHP numbers. 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. A trip to Orlando Speed World provided us with updated quarter-mile times. The GTp heads are like GT 40's with smaller combustion chambers and the spark plugs are relocated for a more efficient burn. Ported Hurricane Single Plane and custom 750 HP. This modification will help your late-model GT40P heads work better with the old-school carbureted intake setup. Holten runs the factory fan, but he had removed it when he ran the 12.63. If this is beyond your technical ability, you could ask a local machine shop to perform the modifications. 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. With the engine reassembled, we boxed up our second camshaft and headed for Westech's dyno. 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. This one added another 10 degrees of duration over the smaller Voodoo cam, along with 0.020 inch more intake valve lift. If there isnt room without disassembling half the front clip on the car, then it might be easier to remove the engine and do the conversion that way. This is not a criticism but instead consider it to be more of a heads-up. i've got a short block started, and i recently came across a set of GT40P heads for FREE ( love family members). Plus you will need to drill all the head bolt holes out as the 351W uses larger head bolts. *** 65 Mustang 351C 4v, AOD, 4.11 gears *** 66 Galaxie convert big block. You can use the stock roller lifters with any size cam you want. 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. I have a very good running stock 1981 302 in a F100 short box. Maybe I'll think about a cam swap? 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. JavaScript is disabled. Calculated compression to 9.8:1. 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. #1:::Throw out all your Magazines that suggest what to do! Posted on May 07, 2014 by promarengine. Despite adding 30 degrees of intake duration, this cam improved torque throughout the entire test from 3,000 rpm on up. Holley 670 street avenger carb. 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. All costing in the end at least another $2k. We gained 45 hp and 40 lb-ft of torque. that is a healthy budget deal. +1 I would go with the regular GT40 heads. This will follow the guideline of a 1.6 rocker baseline and factory bottom end 79-95 related 5.0L Mustangs only. 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 just want to keep it out of detonation. When building an engine there is a lot to take into consideration. Stock 1989 5.0L HO pistons will work if you can find them. Just make sure it is a roller cam. Without changing the stock pistons. I went to a couple in Tucson and almost all the Ford vehicles that came with a 5.0 had the heads missing. 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. This is the main reason why these engines are not modified as much as the small block Chevy. So . Eldelbrocks Air Gap intake manifold should work well with the combination. This is just a quick overview of the changes that need to be done. thats after 3 hours of idling/midrange hits to tune the idle and part throttle . Ford's seminal 302 engine (later re-dubbed the 5.0) has been popular with budget-minded hot rodders for decades. Yeah, except those. a) ain't early and b) aren't 289 heads. 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. 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. The rest went very smoothly, and we reused the stock lifters and suffered no ulcers worrying about breaking in the cam. Well assume it is a 5.0L with stock 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. The multiple-layer steel construction allows the gasket to conform to movement between the cylinder head and block while maintaining a good seal. The 302 uses smaller 7/16" head bolts and your "P" heads may or may not require the step washers. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. Depending on the Headers you have you might be okay. We heated the bottle to 950 psi and hit the button at 4,500 rpm. Most of them are aware of what changes need to be completed. never messed with the timing, its at 35* total . Boy, were we surprised with the results. Gt40 heads/intake from a jy explorer, leave the . And remember ENGINES have been being built/rebuilt/modified for years. fuel injection system . A COMP hydraulic roller cam we found works well with this combination. The kit offers adjustable power from 50 to 250 hp with a simple jet change. Step 2. Along with the heads, we used MAC headers for GT-40P heads. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Here is the lowdown on exhaust manifolds and VALVE SPRINGS. The entire front accessory drive and timing chain cover must be removed, along with the distributor and intake manifold. Advanced: Daily Deals; Help & Contact; Sell; My eBay Expand My . Test 2: Changed to the smaller of the two Lunati camshaftsno other changes. Most of the time, GT-40 heads are worth a good 20-40hp over stock heads. After we installed the heads and with the fan off, he ran a 12.46 at 107.9. We will go into more detail on the head mods in a later story in Junkyard Builder, so watch for it. Even with relatively small valve sizes of 1.85-inch intake and 1.46-inch exhaust, the P-heads flow much better than previous. You can email the site owner to let them know you were blocked. The action you just performed triggered the security solution. I may do some port matching and a little cleanup, otherwise just a set of springs and cam and see what I have. 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. Anyways, I know the gt40ps will bump . 1985 Mustang GT Mild 331 4bbl 5 spd, 1985 SEFI LTD LX AOD. For all of us interested in Gt40p heads. Can I run the new cam with the same roller hydraulic lifters or do I have to change the lifters too? $700.98. 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. SB Ford, GT40 .575" Lift Max Output II Drop in Valve Spring Kit, Hyd Roller, 140 Lb Seat. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); This site uses Akismet to reduce spam. This combination should be good for about 400 horsepower and as much as 500 if you opt to use the stronger aftermarket pistons. Good Luck. 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. BONUS TEST-FOUR DIFFERENT 302 INTAKES.. With gt40p heads and 289 hipo exhaust manifolds changing sparkplugs is the same as the original 302 heads and manifolds, I use the spark plugs that are recomended for the explorer with gt40p heads and you can use straight or angled boots. Ha! 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. On the power side, we selected 400 hp as an impressive but reasonable output for our small-block 5.0L Ford. MAC is the only manufacturer of these headers, and the parts we installed fit like a glove with no problems whatsoever. For both the GT40 and GT40p heads, I STRONGLY suggest upgrading the valve springs. Free shipping for many products! 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. 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. That's an improvement of 22 hp over Test 2. Finally, we exchanged the Explorer's EFI manifold (which is a pretty good manifold in its own right) for an Edelbrock Performer RPM Air Gap intake and a Holley 750-cfm HP-style carburetor. I'll prob take a trip up there this weekend after scavenging the junkyards, thanks a million. For a better experience, please enable JavaScript in your browser before proceeding. The Fora platform includes forum software by XenForo. Well offer one as an example. 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. . 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. Now he serves as a regular contributor to OnAllCylinders. We were cruising the 'yard a while back and located a 2000 Ford Explorer with an EFI 5.0L V-8 engine. I'm using the Trick Flow stage 1 cam with 1.7 roller rockers. I'm 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. Thanks. Within a few hours of his discovery, the engine was sitting in the back of his truck on its way to a new home. We did a quick search for hydraulic roller cams and landed on a COMP camshaft that looked promising. 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. With nitrous, this is easily a mid-11-second ride. If you can get the mentioned GT-40 heads with studs for a good price, that would be good for you. 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. Step 1. I have a 66 mustang with its original untouched 289 with over 140 k on it that Ive been running a blow thru turbo making 14 lbs of boost on for the last 5 years and its never given me a problem. The only way to really make more power is to go with a stroker kit, blower and/or heads. We've already been motivated to put this engine in a buddy's Mustang. the engine is carburated of that makes a difference. Torque on the other hand isnt something to write home about. For 2018, the Coyote makes 460 hp. Install a used set of 5.0L Mustang "shorty" headers, generally available at auto swap meets for a reasonable price. If you know him, ask him. We didn't increase the valve size, although we did have to add Manley valves to get the proper spring-installed height. 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. He'll have to get a gear for his distributor. As usual, there is much more to this story. 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. 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 plan on running a AFM b31 cam too which has relatively small duration for the intake valve. Do not ever, ever think about using the tube type manifolds. These are some of the best castings Ford ever produced for this engine, and are still fairly cheap and available used. Actually, making around 240 to 250 hp with a near-stock Windsor 302 will feel pretty good. Using the manufacturer recommended springs for your camshaft are a safe bet. 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! We are offering a pair of original Ford Cobra 5.0 GT40 cast iron cylinder heads. 950.00 us a set and will ship . You will have to address the 50 oz balance of the 5.0 engine by getting a 50 oz flywheel. There are too many variables to add to this regarding aftermarket stroker kits or components. I'm wondering how these heads will interact with the paxton 1220 sl supercharger I'm trying to put on. You didnt mention what camshaft you would be choosing or exactly which 5.0L Ford Windsor engine you are working with. Yep my **** is coming apart again Isnt life great! Never not once have I ever seen a SBF rod bolt create a failure. Yeah, out of a bolt on upgrade, you'd probably be looking at 260-280rwhp ish with supporting mods. We know what you're thinking--only two-tenths from an extra 45 hp? I added a link to it. What you are trying to do is to increase the amount of airflow through the engine in order to make more power. The valve seats have been cut on a . Small Block V8 (221, 260, 289, 5.0/302, 5.8/351W) - GT40P heads? You can find them on later model Mercury Mountaineers and several other Ford SUV applications. After a couple grand you have a killer set of heads, but there's got to be a less-expensive way of making horsepower. GT40, GT40P, would be great factory heads. What did the heads flow? I have a 432 HP non Hi Po 289 I built. Now we know why Dennis Hilliard of Central Coast Mustang is so high on these heads. With the P-heads requiring pedestal-mount rockers, we also called up Crane Cams for a set of 1.6 pedestal-mount roller rockers. by travis Sun May 03, 2020 8:33 am. 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. Ill do springs and a moderate cam and go for a good, dependable power plant. The MPH was there to run a little better but the local track is about terrible. Everything fits, use the stock rockers and pushrods. . The reason for this is that we're actually replacing mildly worked E7TE heads. As with all head installations, check piston-to-valve clearance before final startup. They suffered from poor aftermarket support up until about 15 years ago when it really came on strong. Smith began writing for Car Craft magazine in 1979 and became editor in 1984. There are several actions that could trigger this block including submitting a certain word or phrase, a SQL command or malformed data. Pride is built, in your garage, with your two hands. It turned out we were conservative on both counts. Holten tells us removing the fan is worth two-tenths in itself, which tells us the fan soaks up roughly 20 hp. Check my post above. The hardest part of swapping the cam was just getting the timing cover off and back on again. If you wanted to make your engine feel strong, these would be a decent investment, but they will require some modifications. 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. Ford GT40P 302 5.0L 4 Bar Cylinder Head Assembly Pair w/ 1/2" Head Bolt Hole. With the GT-40P heads you will need to back off the timing a couple degrees and bump up the fuel pressure. Limited header choice is certainly a challenge. AFR 165cc 58cc Heads. 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. This test went so well that we were eager to see what the slightly bigger cam would do. T5 with 3.73s. The spark plug issue is almost a non-issue. Last Edit: January 18, 2015, 12:05:31 pm by businesstrader Logged shaunp. 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. Mac and Ford Motorsport both make a GT40P spacific header. Cast iron GT40Ps as cast flow better than non-Ps due to revised plug location/angle. 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. A LOT of them do it these days. (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. It has underdrive pulleys, MSD ignition, Bassanni headers and forward exit exhaust. Skip to main content. $930.00 + $55.00 shipping. Win or lose, if you buy the ticket you must take the ride.
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