All manufactured using advanced CNC technology for the extreme durability and precision required of the modern canted valve Ford Small Block at power levels around the 1000 mark reached during recent competitions at the EMC and at the strip. Gt40 heads/intake from a jy explorer, leave the . 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. 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). Yeah, except those. a) ain't early and b) aren't 289 heads. I need that part number too! $169.50. JavaScript is disabled. 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. T5z and 3.89 9" TL rear. #3::: Do your homework,get quality parts,dont skimp. Car Craft mag. 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. The only one that's close, is #7. . It's a classic move we've pulled off many times. With the P-heads requiring pedestal-mount rockers, we also called up Crane Cams for a set of 1.6 pedestal-mount roller rockers. Install a set of 1.7:1 roller-tipped rocker arms on the heads. You might even say its like flogging a dead horse without any animals actually being injured during my moments of sarcasm. Last Edit: January 18, 2015, 12:05:31 pm by businesstrader Logged shaunp. Generally expect with a good cam, intake, roller rockers and a good ignition system to see around 300-350 max rear wheel horsepower, depending on what type of dyno you use. I had a set of 69 302 heads I ran for a while . Or, you could invest in a new set of heads that would also do the same job but you can expect to spend quite a bit more money. The combination of this cam with your intake and headers will produce a very nice street engine. 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. But what we were most impressed with was the solid gain in torque over the smaller Voodoo cam from 3,500 and up. Well that article just got me very ancy, I want these heads!! You can email the site owner to let them know you were blocked. REMANUFACTURED FORD 302 5.0 COBRA GT40 CYLINDER HEADS. I got lucky and found a complete Explorer GT40P engine online. Because of this, your tuneup will probably need to be modified. For the cherry on top of this Blue Oval desert, we bolted Mike Thermos' simple Powerstar plate nitrous system under the carburetor, installed the 140-hp jets (55 fuel and 55 nitrous), and used the trigger to retard the timing on the MSD ignition by 8 degrees. The GT40 and GT40P cylinder heads are highly sought after, but how do they stack up against other cylinder heads, and is it worth it to upgrade the Fox Body's 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. Both swaps made more sense when parts were readily available at the bone yard for cheap. Compare. how hard to put on? You just want to keep it out of detonation. Once the headers are in place, then you can consider if you still want more power. Horse Sense: The smaller valves found in GT-40P heads improve airflow velocity. The car weighs #2835 with driver. I added a link to it. Learn how your comment data is processed. #1:::Throw out all your Magazines that suggest what to do! That's more than enough to feed a power-brake booster. Also, the spark plug angle makes it a pain. Rowe studied engineering, philosophy and American literature at Central Florida Community College. It's an 86 roller 5.0 engine that had a recent rebuild sometime in the past with keith black pistons, otherwise stock. 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. 950.00 us a set and will ship . GT40Ps have 58cc. Without changing the stock pistons. However I think the opportunity window is slowly closing. Start with any 302 block, but try to find one from 1985 and up since it will already have provisions for a roller camshaft. SBF engines are modified constantly. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. Pretty sure that was name, but I could be wrong. This engine will be good for your 65 Mustang. 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. First, adding headers will improve power on the existing combination. 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. Hey all, I'm working on building a 302 with my gt40p heads. 02-11-2012, 07:16 PM #6 fiveoh 86lx Calculating pushrod length Features hardened 4140 Chromoly retainers, valve locks, spring shims, a spring height gauge, valve seals, and instructions. There was an article in Hot Rod magazine in the mid '80's where Jon Kaase was developing 351w packages. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. We've already been motivated to put this engine in a buddy's Mustang. ported GT-40p, ported cobra intake, 65mm BBK, e-cam with 1.7s, longtubes, off-road x-pipe with flowmasters dumped. 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. Because of this, your tuneup will probably need to be modified. Instructions on porting the GT-40p heads here. Some ideas never go out of style. 87-93-95 Ford Mustang GT40P Engine Cylinder Heads REBUILT 302 351 GT40 SBF OEM | eBay Motors, Parts & Accessories, Car & Truck Parts & Accessories | eBay! THANKS VERY MUCH! built one using a 91' HO short block with a set of AFR 165 heads, Weiand . Skip to main content. 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. There are too many variables to add to this regarding aftermarket stroker kits or components. AFR 165 Heads | Have options for pedestal mounted rocker arms or stud mounted rocker arms. Definitely going to use my P heads. Holten runs the factory fan, but he had removed it when he ran the 12.63. Slover primarily focused on the exhaust side of the GT40P heads. Seriously though if you're not planning on an all-out attack for HP, I'd consider a forged piston out of Probe's SRS line-up. I turned it because it was tired when I got it. Limited header choice is certainly a challenge. I have managed to get 402 horse power from a 289 hipo natural aspirated. Motor is going into a Ranger. No-option stripper- I like strippers. You'll have to plug the oil hole that is in the engine from the old oil dipstick. Holten tells us removing the fan is worth two-tenths in itself, which tells us the fan soaks up roughly 20 hp. The Fora platform includes forum software by XenForo. Late-model ford GT40 and GT40P heads with 1.84-inch intake valves will also flow 185 cfm at 0.50 . Enter your search keyword. 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. . I'd much rather be able to drive it at 8 or 9/10s of what it can handle. Assorted screwdrivers, pliers and vise-grips. We were cruising the 'yard a while back and located a 2000 Ford Explorer with an EFI 5.0L V-8 engine. The multiple-layer steel construction allows the gasket to conform to movement between the cylinder head and block while maintaining a good seal. 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. If you go with a diffrent cam, make sure you change springs, The Trick Flow kit comes with everything for around $130. With the GT-40P heads you will need to back off the timing a couple degrees and bump up the fuel pressure. Ford GT40P 302 5.0L 4 Bar Cylinder Head Assembly Pair w/ 1/2" Head Bolt Hole. 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. 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. The GT40 & GT40P heads had a few differences that are note-worthy, the most importantly being the bump in compression. I have a 5.0 from a 1992 Mustang in my 65. If they are cheap enough, take them anyway. Application Fits 1979-95 Mustang 302/351 w/ OEM Small Block Ford Heads Building a 302-inch small-block to produce 400 hp is really no big deal, but doing. 1 - 7 of 7 Posts. I got lucky and found a complete Explorer GT40P engine online. i have a 302 engine from a 1977 granada and i am wondering if gt40p heads from an explorer will fit on this motor. The GT40P cylinder heads had a small combustion chamber ranging from 58-61cc while the GT40 heads had a 63-66cc combustion chamber. 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. I just read about this build on the corral.net. A LOT of them do it these days. If I get different urges later, Ill pursue those then. However there are plenty of factory heads that with the help of an experienced machine shop can be great. Actually, making around 240 to 250 hp with a near-stock Windsor 302 will feel pretty good. Well also assume that this engine is running stock exhaust manifolds. 1983 Mustang G.T. Well assume it is a 5.0L with stock heads. (its not their engine) 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. That's a 40 per cent increase in power from a simple head and cam swap, and one seriously happy Mustang owner! Tim's junkyard refugee survived the beating and we had a bitchin' story. After we installed the heads and with the fan off, he ran a 12.46 at 107.9. Not when you can buy a set of Promaxx or AFR Enforcer heads for $1000, that already have decent hardware included. The spark plug issue is almost a non-issue. E303 Cam advanced 4 degrees. For a better experience, please enable JavaScript in your browser before proceeding. $139.99. Ford GT40P 302 5.0L 4 Bar Cylinder Head Assembly Pair w/ 1/2" Head Bolt Hole. Related Resources Mustang Generation Nicknames: What Do They Mean? 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 keep stock drivability, and stock gas milage if you can stay out of boost. This is not a criticism but instead consider it to be more of a heads-up. Choose a cylinder head before you install the pistons. Nudge us with emails, and we'll make it happen. I was looking at putting on the GT40P heads on. This is the main reason why these engines are not modified as much as the small block Chevy. Joined: Sun Mar 15, 2009 9:31 am. Let us explain. Dec 8, 2011. 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. What did the heads flow? Through Central Coast you can have the heads fully prepped for your combination. As usual, there is much more to this story. 302, GT40P Heads, E cam, 4 into 4, Holley 600, Mallory Unilite, Levy SD T5, 3.73, 15" Team III, firewall mod, trunk mod, trailer hitch, drivers foot box mod, front tow rings. There are a couple of reasons for this suggestion. 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. 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 head fits years 95-01 explorer mountaineer mercury mountaineer . I got rid of the carburetor and went with a F.A.S.T. 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. Their weak point is that the rotator used on the exhaust valve is very thick. Mar 23, 2004. I must agree with Jeff Smith. The longer duration created a slight loss of torque below 3,300 rpm compared to both previous cams, but beyond that mild loss of power, the bigger Voodo out-powered its smaller cousin, cranking out a peak torque of 355 lb-ft at 4,300 (a gain of 7 lb-ft over Test 2) and charging to a peak horsepower of 376 at 6,000 rpm. With nitrous, this is easily a mid-11-second ride. $700.98. Because its all been done time after time after. They work, but present their own challenges. I am very happy too. The Fora platform includes forum software by XenForo. Free shipping. They were located in Tahachapi CA, and were sold with upgraded springs for $650.00, back in 2002-2003 ish. The engine never huffed oil out of the breathers, and the spark plugs all looked excellent. Very true about finding them at the local yards. Well offer one as an example. Smith began writing for Car Craft magazine in 1979 and became editor in 1984. i've got a short block started, and i recently came across a set of GT40P heads for FREE ( love family members). Stock 1989 5.0L HO pistons will work if you can find them. HiPo manifolds and Ill be good. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. There are literally a dozen or so camshaft companies that offer a mild hydraulic roller cam for a 5.0L Ford. 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 ran the Speed Pro L2488 pistons and it had me around 9.9 compression with a .041 head gasket, Now I had GT40 heads milled .020 and so that's just a guess on the CC. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. This combination should be good for about 400 horsepower and as much as 500 if you opt to use the stronger aftermarket pistons. We also discovered some issues with the GT40P heads that required changes, so we added valves from Manley that eliminated the exhaust-valve rotators and allowed us to set the proper valvespring installed height. I recall having an absolute blast with my old K-code coupe back in the day. Win or lose, if you buy the ticket you must take the ride. What you are trying to do is to increase the amount of airflow through the engine in order to make more power. Over $2050 for the 165/185 renegades. If you smooth out the bowls and exhaust ports and gasket match the intakes they should flow decent. Install a used set of 5.0L Mustang "shorty" headers, generally available at auto swap meets for a reasonable price. Different years can have different combustion chamber sizes but ffor the most part there will be no performance increases by going with 302 heads. I can tell you that with my 9.503 block, 22cc dished pistons and 64cc heads, I'm at 9.5:1 compression. And have discovered something that I dont think anyone else knows. But dont think that adding a bigger camshaft will make more power. 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. Not sure about that but got some pictures of the cast iron explorer manifolds on a 302. Cast iron GT40Ps as cast flow better than non-Ps due to revised plug location/angle. I'll prob take a trip up there this weekend after scavenging the junkyards, thanks a million. 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. 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. This one added another 10 degrees of duration over the smaller Voodoo cam, along with 0.020 inch more intake valve lift. I don't need tons of power to enjoy the car. They also have emissions legal heads as well. Not to mention, they will run circles around GT40P's out of the box. These engines came with the GT40P head, which even with its small valves, offers really good performance. Come join the discussion about restoration, modifications, NOS parts, troubleshooting, VIN codes, and more! There are caveats to this plan, however. They almost seem like flywheel numbers rather than RWHP numbers. I'd get the gt40 setup, and put an s trim on it. Step 2. Assemble the rotating assembly with a stock 5.0L crankshaft, a set of 5.0L rods and the specified pistons with stock-type rings. 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 no other changes we gained 25 hp using factory iron heads. I went to a couple in Tucson and almost all the Ford vehicles that came with a 5.0 had the heads missing. 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. In less than an hour, we were ready to test. AFR 165cc 58cc Heads. All Ford Mustangs | Model Specific Forums, GT-40P Heads - 5.0 Mustang & Super Fords Magazine. We didn't increase the valve size, although we did have to add Manley valves to get the proper spring-installed height. Works on all factory cast iron E7, GT40, and GT40P cylinder heads! I guess someone could just do a basic valve job and throw on the GT40 upper/lower intake for a cheap HP boost. With the engine reassembled, we boxed up our second camshaft and headed for Westech's dyno. 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. With the tuning finalized, the little cam made far more power than we expected, cranking out 328 lb-ft of torque at 4,200 and 294 hp at 5,400 rpm. 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. how much HP and torque? T5 with 3.73s. I bought a crate 302 from Downs Ford a few years ago that was producing 320 hp. Headers and a camshaft will help but the engine really needs aftermarket 3/8 inch connecting rod bolts and aftermarket cylinder heads. You will have to get special headers to fit these heads since the spark plugs are angled differently than normal 5.0 heads. On slicks the car went some low 7.70s right at 90mph. 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. Central Coast Mustang sells GT-40P heads at a great price, making them a viable alternative in a market flooded with performance head choices. could the gear of off the oil pump drive(i know they're DIS), for the explorer motor be used on his dizzy? These are Ford iron GT-40P heads. I've got gt40p heads for it I'll be running, and can't afford better . BONUS TEST-FOUR DIFFERENT 302 INTAKES.. fordfan289, Aug 27, 2011 The later model distributors had a different diameter shaft than the earlier ones. Not sure how they would mate up to your existing exhuast, but otherwise they should work. SB Ford GT40 Drop In Valve Springs Kit, Hyd Roller w/ Stock Cam, .450" lift and below. 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. Come join the discussion about performance, builds, modifications, reviews, engine swaps, classifieds, troubleshooting, maintenance, and more! The factory heads have a boss for the exhaust valve that restricts flow through the exhaust port. LOW-BUCK 302 FORD HEAD UPGRADE Richard Holdener 239K subscribers 189K views 2 years ago WESTECH PERFORMANCE GROUP WHAT'S IT WORTH? 69.90.139.244 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. Sponsored. A solid 300-325 hp should be plenty and that's with good drivability and reliability as well. I've not seen a set of longtubes that have an issue with GT40P's, either. Where they differ is the combustion chamber size.