With the engine reassembled, we boxed up our second camshaft and headed for Westech's dyno. We didn't increase the valve size, although we did have to add Manley valves to get the proper spring-installed height. Maybe I'll think about a cam swap? Those heads were unported and had stock valve sizes! 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. Ive been building ENGINES for 40+ years. If you can get the mentioned GT-40 heads with studs for a good price, that would be good for you. Can anyone give me a little feedback about a '99 Explorer 5.0, and tell me if it's my answer. The "P" heads flow better. Buy the lifters for peace of mind now and hopefully for the duration. It turned out we were conservative on both counts. Good on ya Jeff Smith. Boy, were we surprised with the results. Here is my setup. The question was whether we wanted a torquey small-block or a more cammed-up rpm engine to boost peak horsepower. REMANUFACTURED FORD 302 5.0 COBRA GT40 CYLINDER HEADS. Holley 670 street avenger carb. You didnt mention which cam you had in mind. A forum community dedicated to Ford Mustang owners and enthusiasts. Really hurt too. 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? . Install a used set of 5.0L Mustang "shorty" headers, generally available at auto swap meets for a reasonable price. We set the timing to 34 degrees and rejetted the carburetor to get our desired 12.5:1 air/fuel ratio. T5 with 3.73s. Actually, making around 240 to 250 hp with a near-stock Windsor 302 will feel pretty good. I can tell you that with my 9.503 block, 22cc dished pistons and 64cc heads, I'm at 9.5:1 compression. Thanks for the help, I was planning on puttingin roller rockers or at least new springs, and that engine looks great, hoppfully mine will look at least similar to that one of these days. This website is using a security service to protect itself from online attacks. Posted on May 07, 2014 by promarengine. PTP Engineering front suspension and 25540R17s all around. We will go into more detail on the head mods in a later story in Junkyard Builder, so watch for it. Install a set of GT-40P cylinder heads from a late 1990's Ford Explorer or a set of GT40 heads from an early 1990's Mustang 5.0L. With. There are too many variables to add to this regarding aftermarket stroker kits or components. 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. I turned it because it was tired when I got it. 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. The factory heads have a boss for the exhaust valve that restricts flow through the exhaust port. Yea. T5z and 3.89 9" TL rear. I have a 432 HP non Hi Po 289 I built. We gained 45 hp and 40 lb-ft of torque. The reply has so many assumptions that I cant even assume to know the answer. Going from your heads to the GT40p heads will bump your compression by about a point.so hello bottom end torque. 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. $700.98. I don't need tons of power to enjoy the car. This pushed that little Ford to a peak horsepower of 503, and that was where we stopped. I'd much rather be able to drive it at 8 or 9/10s of what it can handle. However I think the opportunity window is slowly closing. 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. The headers will improve this airflow throughout the entire rpm rangeadding more torque and horsepower. Headers and a camshaft will help but the engine really needs aftermarket 3/8 inch connecting rod bolts and aftermarket cylinder heads. Like I said lots of options. 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. We took the heads to Mike Slover of Slover's Porting Service in Sun Valley, California, to do this work, plus some basic pocket-porting to improve flowespecially on the exhaust side. For a better experience, please enable JavaScript in your browser before proceeding. bmcdaniel, Feb 17, 2004 #7. v8maverick Member. Weiand 7515 xcellerator intake. Keep in mind that swapping camshafts is a fairly extensive effort. He'd be the best source. A bone stock 2bbl early 351w with stock replacement forged pistons (9.0 compression) and dyno headers made 211 Hp . 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. What did the heads flow? You just want to keep it out of detonation. . These heads have been remanufactured using refaced reclaimed Factory Valves. #3::: Do your homework,get quality parts,dont skimp. I added a link to it. Yeah, out of a bolt on upgrade, you'd probably be looking at 260-280rwhp ish with supporting mods. The action you just performed triggered the security solution. 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 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. But don't think that adding a bigger camshaft will make more power. Small Block Ford 289/302/5.0L/351w 180cc/60cc Aluminum Cylinder Head E42004. 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. Because of this, your tuneup will probably need to be modified. Yeah, except those. a) ain't early and b) aren't 289 heads. Car Craft mag. 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. This is a function of the somewhat wider lobe-separation angle of 112 degrees. 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. But the part about a cam replacement possibly being a labor intensive undertaking is correct. If I get different urges later, Ill pursue those then. The GT40P heads flow a lot better than stock 351 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. Now we know why Dennis Hilliard of Central Coast Mustang is so high on these 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. The newer camshaft is designed for use with a soft bronze distributor gear, not the hardened steel gear used for older camshafts. This will keep you from dropping your overall static compression ratio and losing power. For a better experience, please enable JavaScript in your browser before proceeding. As noted, this is looking like hes building a 351 Lightning truck motor, which is a good way to go. Building a 302-inch small-block to produce 400 hp is really no big deal, but doing. GT40Ps have 58cc. A LOT of them do it these days. 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. I have a 302 Windsor V8 EFI engine that I converted to a 600 cfm carburetor with a Street Warrior intake manifold. 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 multiple-layer steel construction allows the gasket to conform to movement between the cylinder head and block while maintaining a good seal. i've got a short block started, and i recently came across a set of GT40P heads for FREE ( love family members). . .. i would not buy valves unless you need them amd would not switch to studs with these heads for your low hp . Thanks. This modification will help your late-model GT40P heads work better with the old-school carbureted intake setup. Ill do springs and a moderate cam and go for a good, dependable power plant. These are a great head but do need some machining mods to make they really work well. Anyways, I know the gt40ps will bump . Ford GT40P 302 5.0L 4 Bar Cylinder Head Assembly Pair w/ 1/2" Head Bolt Hole. SB Ford GT40P Drop In Valve Springs Kit, Hyd Roller w/ Stock Cam, .450" lift and below. 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. Stock 1989 5.0L HO pistons will work if you can find them. The reason for this is that we're actually replacing mildly worked E7TE heads. You can have your current 28 oz rebalanced to 50. 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. 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. 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. 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. For the first test, we were reusing the stock Explorer cam, so the engine didn't need any break-in time. Not bad for off the shelf parts and a stock shortblock. After graduating from Iowa State University with a journalism degree in 1978, he combined his two passions: cars and writing. I had those on my car before I upgraded and they were nice heads. 1979 Indy 500 Pace Car. This is needed for the steel roller cam. 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. JUNKYARD GT40P HEADS-ADD 30+ HP TO YOUR 5.0L (FOR FREE?) They suffered from poor aftermarket support up until about 15 years ago when it really came on strong. Ford's seminal 302 engine (later re-dubbed the 5.0) has been popular with budget-minded hot rodders for decades. That's an improvement of 22 hp over Test 2. 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. Do not ever, ever think about using the tube type manifolds. BONUS TEST-FOUR DIFFERENT 302 INTAKES.. For a better experience, please enable JavaScript in your browser before proceeding. 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. 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. 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. Rowe studied engineering, philosophy and American literature at Central Florida Community College. Now he serves as a regular contributor to OnAllCylinders. 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. This is an older thread, you may not receive a response, and could be reviving an old thread. That's fantastic for the minimal investment we made. I'm using the Trick Flow stage 1 cam with 1.7 roller rockers. E303 Cam advanced 4 degrees. I need that part number too! How much HP and torque do you think I. They are more expensive than standard head gaskets, but they also do the job and are worth the additional money. No-option stripper- I like strippers. Install a Ford Motorsport E303, X303 or F303 cam, or any of the similar units from Indy, Lunati or your favorite manufacturer. 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. how hard to put on? Features hardened 4140 Chromoly retainers, valve locks, spring shims, a spring height gauge, valve seals, and instructions. For real performance, stock E7TE heads leave a lot to be desired. 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. 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. They also have emissions legal heads as well. The 2 heads are about the same when looking at the numbers with the GT40p heads having a slight edge. . Hey all, I'm working on building a 302 with my gt40p heads. Be careful, I was once bitten by one of those reptile engine builders. These are Ford iron GT-40P heads. After we installed the heads and with the fan off, he ran a 12.46 at 107.9. (its not their engine) There are several actions that could trigger this block including submitting a certain word or phrase, a SQL command or malformed data. And have discovered something that I dont think anyone else knows. On the power side, we selected 400 hp as an impressive but reasonable output for our small-block 5.0L Ford. With nitrous, this is easily a mid-11-second ride. The MPH was there to run a little better but the local track is about terrible. 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. We did a quick search for hydraulic roller cams and landed on a COMP camshaft that looked promising. That's a 40 per cent increase in power from a simple head and cam swap, and one seriously happy Mustang owner! 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! Nice to see actual dyno results instead of "butt dyno" guesses. JavaScript is disabled. fordfan289, Aug 27, 2011 - I have a 1989 f150 with a 302 5 spd. 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. 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. If you can find individual flanged headers like the obsolete MAC headers had, those worked really well with GT40P's. After a couple grand you have a killer set of heads, but there's got to be a less-expensive way of making horsepower. In addition, the cam timing was designed for torque, with duration somewhere around 190 degrees at 0.050 with roughly 0.450-inch lift. 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. All Ford Mustangs | Model Specific Forums, GT-40P Heads - 5.0 Mustang & Super Fords Magazine. 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 I may do some port matching and a little cleanup, otherwise just a set of springs and cam and see what I have. Most of them are aware of what changes need to be completed. There was an article in Hot Rod magazine in the mid '80's where Jon Kaase was developing 351w packages. Manual trans. hole size 302 is 7/16 and 351 is 1/2 HAD '82 GT monochromatic (red).black cloth HAVE Compare. Calculating pushrod length 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. Assorted screwdrivers, pliers and vise-grips. Even with relatively small valve sizes of 1.85-inch intake and 1.46-inch exhaust, the P-heads flow much better than previous. 402 HP NA from a HI PO 289 isnt that mysterious of a feat to accomplish with todays SBF Aftermarket parts availability. this is the price for one head. Compare. Thank You. 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 think one of the finer traits of a true car guy, is the patience to put a prized car away and just let it sit for a while rather than selling it when life gets in the way.

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