302 with gt40p heads horsepowerprotest behavior avoidant attachment
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. We know what you're thinking--only two-tenths from an extra 45 hp? 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 However there are plenty of factory heads that with the help of an experienced machine shop can be great. I just read about this build on the corral.net. Just got through porting one of my gt40p heads today. 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. You will have to address the 50 oz balance of the 5.0 engine by getting a 50 oz flywheel. I was thinking the same but the enforcers are $647ea now so $1400 (inc tax) is the entry price for good set of heads. Well that article just got me very ancy, I want these heads!! Yea. check out the. It runs smooth but seems lazy. I was looking at putting on the GT40P heads on. 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. The 2 heads are about the same when looking at the numbers with the GT40p heads having a slight edge. FULL DYNO RESULTS. P-heads have a smaller combustion chamber at 59cc, which will bump the compression ratio up on an otherwise-stock 5.0 engine. 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. $700.98. Going from your heads to the GT40p heads will bump your compression by about a point.so hello bottom end torque. #1:::Throw out all your Magazines that suggest what to do! P-heads have a smaller combustion chamber at 59cc, which will bump the compression ratio up on an otherwise-stock 5.0 engine. Is asking advice for a fairly common situation involving parts with mandatory compatibility between the two for performance and longevity. While the heads were off getting a massage, we turned our attention to the cam timing. If I get different urges later, Ill pursue those then. 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. But don't think that adding a bigger camshaft will make more power. I'm using the Trick Flow stage 1 cam with 1.7 roller rockers. I went to a couple in Tucson and almost all the Ford vehicles that came with a 5.0 had the heads missing. PTP Engineering front suspension and 25540R17s all around. Compare. 1979 Indy 500 Pace Car. They were located in Tahachapi CA, and were sold with upgraded springs for $650.00, back in 2002-2003 ish. Anythoughts? The newer camshaft is designed for use with a soft bronze distributor gear, not the hardened steel gear used for older camshafts. Hey all, I'm working on building a 302 with my gt40p heads. The GT40P heads had a small combustion chamber ranging from 58-61cc while the GT40 heads had a 63-66cc combustion chamber. United Engine and Machine sells cheap but decent pistons that will do what you're wanting. 87-93-95 Ford Mustang GT40P Engine Cylinder Heads REBUILT 302 351 GT40 SBF OEM | eBay Motors, Parts & Accessories, Car & Truck Parts & Accessories | eBay! Once you get into the FoMoCo aftermarket aluminum GT40s though, all bets are off. Rowe studied engineering, philosophy and American literature at Central Florida Community College. Commonly referred to as Explorer heads, GT-40P iron castings are found on current 5.0-equipped Explorers. I must agree with Jeff Smith. bmcdaniel, Feb 17, 2004 #7. v8maverick Member. 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. What did the heads flow? We turned to Rare Auto Design in Orlando for dyno tests to find out how much horsepower we gained. For a better experience, please enable JavaScript in your browser before proceeding. HiPo manifolds and Ill be good. These timeslips are from 1280' above sea level. 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. 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. As with all head installations, check piston-to-valve clearance before final startup. 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. If you dont feel comfortable doing this higher a pro. Stock 1989 5.0L HO pistons will work if you can find them. Along with the heads, we used MAC headers for GT-40P heads. 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. I am very happy too. As usual, there is much more to this story. For 2018, the Coyote makes 460 hp. This 1979-1995 Mustang cylinder head and camshaft guide will overview the heads and cams we offer and how they will coincide. '85 GT vert two tone (white on charcoal)white leather, http://www.facebook.com/groups/233213650060739/, http://www.summitracing.com/parts/TFS-2500100/, 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 Perhaps even more surprising was how well this engine idled, calmly purring with 16 inches of manifold vacuum at 980 rpm. Click to reveal AFR 165cc 58cc Heads. The GT40 heads have thermactor holes built in to connect to the EGR/smog equipment whereas the GT40P heads use an external EGR connective system. All in all, the addition of GT-40P heads to any 5.0 Mustang is a worthwhile venture, especially if you're on a budget (aren't we all) or shooting for the Trophy Stock title. The GT40P heads flow a lot better than stock 351 heads. We then dyno'd the car without the fan to get some consistency and were rewarded with a peak of 316 hp at 5,500 rpm, and 348 lb-ft of torque at 4,000 rpm. 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. people can stop saying that adding aftermarket cam with stock heads is a waste of time. With the P-heads requiring pedestal-mount rockers, we also called up Crane Cams for a set of 1.6 pedestal-mount roller rockers. An aggressive cam will wake it up a bit. When building an engine there is a lot to take into consideration. AFR 165 Heads | Have options for pedestal mounted rocker arms or stud mounted rocker arms. The later model distributors had a different diameter shaft than the earlier ones. Headers and a camshaft will help but the engine really needs aftermarket 3/8 inch connecting rod bolts and aftermarket cylinder heads. If you go with a diffrent cam, make sure you change springs, The Trick Flow kit comes with everything for around $130. Note the head bolt hole issue, some GT40 iron heads had 1/2 holes, if not they will need to be enlarged. The cost of a new set of standard replacement roller lifters is very affordable at major retailers like Summit. Those heads were unported and had stock valve sizes! These are some of the best castings Ford ever produced for this engine, and are still fairly cheap and available used. Very true about finding them at the local yards. Well also assume that this engine is running stock exhaust manifolds. Required fields are marked *. Don't let the fact that the iron GT40 heads have a larger exhaust valve fool you. However I think the opportunity window is slowly closing. Come join the discussion about performance, builds, modifications, reviews, engine swaps, classifieds, troubleshooting, maintenance, and more! 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. 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. 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. Holten runs the factory fan, but he had removed it when he ran the 12.63. If you wanted to make your engine feel strong, these would be a decent investment, but they will require some modifications. GT40P heads, what kind of performance do they give? +1 I would go with the regular GT40 heads. With the GT-40P heads you will need to back off the timing a couple degrees and bump up the fuel pressure. I got a set of AFR heads , night and day. Even with a stock Mustang 5.0 cam makes good power. For both the GT40 and GT40p heads, I STRONGLY suggest upgrading the valve springs. Even with relatively small valve sizes of 1.85-inch intake and 1.46-inch exhaust, the P-heads flow much better than previous. Took me 7 hours to do one head.but they cleaned up real nice. If you're running a stock cam, 1.7 rockers will work perfectly. However, when we dyno'd the car before installing the GT-40P heads, the fan was on the car. Using the manufacturer recommended springs for your camshaft are a safe bet. 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. T5z and 3.89 9" TL rear. 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). Overview. After we installed the heads and with the fan off, he ran a 12.46 at 107.9. 68stang351 Founding Member May 16, 2002 850 . just curious. You just want to keep it out of detonation. 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. Boy, were we surprised with the results. Ill do springs and a moderate cam and go for a good, dependable power plant. These engines came with the GT40P head, which even with its small valves, offers really good performance. These are Ford iron GT-40P heads. Runs well. This pushed that little Ford to a peak horsepower of 503, and that was where we stopped. Buy the lifters for peace of mind now and hopefully for the duration. Consider having the head's intake ports matched to the intake manifold gasket. Compare. The 302 uses smaller 7/16" head bolts and your "P" heads may or may not require the step washers. Assorted screwdrivers, pliers and vise-grips. Depending on the Headers you have you might be okay. Long tube headers are a terrific idea, but you need to open up the exhaust side. You gave me the info I was looking for, and I really do appreciate it. Just make sure it is a roller cam. JUNKYARD GT40P HEADS-ADD 30+ HP TO YOUR 5.0L (FOR FREE?) 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. Ha! We were cruising the 'yard a while back and located a 2000 Ford Explorer with an EFI 5.0L V-8 engine. Its funny no one mentioned anything about ignition timing or components, Your email address will not be published. What would be the best cam and springs to use for these heads in a 302 Windsor? There are literally a dozen or so camshaft companies that offer a mild hydraulic roller cam for a 5.0L Ford. I have a 5.0 from a 1992 Mustang in my 65. Richard Holdener 240K subscribers Subscribe 63K views 1 year ago WESTECH PERFORMANCE GROUP LOW BUCK, GT40P 5.0L HEADS-CHEAP &. There are too many variables to add to this regarding aftermarket stroker kits or components. Learn how your comment data is processed. A forum community dedicated to Ford Mustang owners and enthusiasts. I had a set of 69 302 heads I ran for a while . I wouldnt recommend reusing lifters though. 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. There are several actions that could trigger this block including submitting a certain word or phrase, a SQL command or malformed data. The only way to really make more power is to go with a stroker kit, blower and/or heads. A solid 300-325 hp should be plenty and that's with good drivability and reliability as well. 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. Enter your search keyword. 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. This one added another 10 degrees of duration over the smaller Voodoo cam, along with 0.020 inch more intake valve lift. 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. For the most part 302 heads and 351W heads are the same. The engine was only rated at 215 hp, but it at least had 9.0:1 compression. There are caveats to this plan, however. Not sure how they would mate up to your existing exhuast, but otherwise they should work. JavaScript is disabled. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. These are some of the best castings Ford ever produced for this engine, and are still fairly cheap and available used. But the part about a cam replacement possibly being a labor intensive undertaking is correct. #2::: Get advice from a reptile engine builder with experience(first flag for me is when somebody refers to an ENGINE as a MOTOR! 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. The GT40 & GT40P heads had a few differences that are note-worthy, the most importantly being the bump in compression. You can email the site owner to let them know you were blocked. i have a question once i get the gt40p heads from the explorer truck can i also take the exhaust manifolds or headers and fit them in my 66 mustang:?:!?!?!? I've not seen a set of longtubes that have an issue with GT40P's, either. I'm running BBK un-equal length shorty's, and I'm able to get all the plugs in, tight, and all plug wires on. I can tell you that with my 9.503 block, 22cc dished pistons and 64cc heads, I'm at 9.5:1 compression. Not when you can buy a set of Promaxx or AFR Enforcer heads for $1000, that already have decent hardware included. I've got gt40p heads for it I'll be running, and can't afford better . The spark plug issue is almost a non-issue. It's a classic move we've pulled off many times. 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. Not looking for crazy HP. I'll prob take a trip up there this weekend after scavenging the junkyards, thanks a million. Thanks. Start with any 302 block, but try to find one from 1985 and up since it will already have provisions for a roller camshaft. 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. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. For the first test, we were reusing the stock Explorer cam, so the engine didn't need any break-in time. This is not a criticism but instead consider it to be more of a heads-up. Some ideas never go out of style. Step 2. The MPH was there to run a little better but the local track is about terrible. If you're going to use the stock 289 heads, install 1.84-inch intake valves, then port the intake and exhaust; these mods will net you about 185 cfm of intake port flow at 0.50 lift. Ford GT40P 302 5.0L 4 Bar Cylinder Head Assembly Pair w/ 1/2" Head Bolt Hole. 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). This is what I recommend to everyone who is doing a budget 5.0 build. Common sense would suggest that with the heavy lifting complete and the old cam removed, by not installing the new roller lifters along with the camshaft could be asking for the possibility of trouble just a few thousand miles down the road. We gained 45 hp and 40 lb-ft of torque. I'm wondering how these heads will interact with the paxton 1220 sl supercharger I'm trying to put on. Cant wait to try um out. 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. I was thinking the same but the enforcers are $647ea now so $1400 (inc tax) is the entry price for good set of heads. This will follow the guideline of a 1.6 rocker baseline and factory bottom end 79-95 related 5.0L Mustangs only. I bought a crate 302 from Downs Ford a few years ago that was producing 320 hp. Not sure about that but got some pictures of the cast iron explorer manifolds on a 302. Also, you'll need to get a steel distributor gear to replace the iron gear that is currently on your distributor. Never not once have I ever seen a SBF rod bolt create a failure. This is needed for the steel roller cam. 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. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Can anyone give me a little feedback about a '99 Explorer 5.0, and tell me if it's my answer. We also added an Edelbrock Performer RPM dual-plane intake and a set of 158-inch headers with no mufflers. 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. Best of all, no machining is required to install these on your stock cast iron heads! HAD '82 GT monochromatic (red).black cloth HAVE Gasoline/Diesel all makes on earth & still doing it today with great pride.Feel free to contact me anytime. And have discovered something that I dont think anyone else knows. Dec 8, 2011. The engine never huffed oil out of the breathers, and the spark plugs all looked excellent. Manual trans. (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. 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. 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. This is a function of the somewhat wider lobe-separation angle of 112 degrees. In 1987, he assumed the role of editor for Hot Rod magazine before returning to his first love of writing technical stories. 68 XR7 & 68 M-100. Ported Hurricane Single Plane and custom 750 HP. 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. A forum community dedicated to Ford performance owners and enthusiasts. Torque on the other hand isnt something to write home about. hole size 302 is 7/16 and 351 is 1/2 This is a common mistake with first-time cam buyers who dont necessarily appreciate that the cam is just one component of the overall engine package.
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