Performance & security by Cloudflare. Depends on the budget. The specs are a conservative 212/218 degrees of duration at 0.050-inch tappet lift but offer a really nice 0.512-inch valve lift for both the intake and exhaust. Over $2050 for the 165/185 renegades. Here a comparison of different heads on a 302: I'm very happy with my GT40P. A forum community dedicated to vintage Ford Mustang owners and enthusiasts. Their weak point is that the rotator used on the exhaust valve is very thick. Can anyone give me a little feedback about a '99 Explorer 5.0, and tell me if it's my answer. 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 only one that's close, is #7. 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. The only way to really make more power is to go with a stroker kit, blower and/or heads. These engines came with the GT40P head, which even with its small valves, offers really good performance. You gave me the info I was looking for, and I really do appreciate it. Small Block Ford 289/302/5.0L/351w 180cc/60cc Aluminum Cylinder Head E42004. . hole size 302 is 7/16 and 351 is 1/2 check out the. It has underdrive pulleys, MSD ignition, Bassanni headers and forward exit exhaust. Everything fits, use the stock rockers and pushrods. Once the headers are in place, then you can consider if you still want more power. $139.99. Actually, making around 240 to 250 hp with a near-stock Windsor 302 will feel pretty good. Location: Re: Stock Ford 351W 4bbl dyno numbers. Not sure how they would mate up to your existing exhuast, but otherwise they should work. This will keep you from dropping your overall static compression ratio and losing power. There are a couple of reasons for this suggestion. I got a GT40P off the assembly line years ago. 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. 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. Come join the discussion about performance, production numbers, VIN decoders, modifications, troubleshooting, power adders, DIY tutorials, and more! 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. Without changing the stock pistons. bmcdaniel, Feb 17, 2004 #7. v8maverick Member. Going from your heads to the GT40p heads will bump your compression by about a point.so hello bottom end torque. Here is the lowdown on exhaust manifolds and VALVE SPRINGS. Rowe studied engineering, philosophy and American literature at Central Florida Community College. 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. E303 Cam advanced 4 degrees. The GT40P heads flow a lot better than stock 351 heads. For the most part 302 heads and 351W heads are the same. 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. That's a 40 per cent increase in power from a simple head and cam swap, and one seriously happy Mustang owner! 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. Never not once have I ever seen a SBF rod bolt create a failure. I plan on running a AFM b31 cam too which has relatively small duration for the intake valve. Let us explain. P-heads have a smaller combustion chamber at 59cc, which will bump the compression ratio up on an otherwise-stock 5.0 engine. As noted, this is looking like hes building a 351 Lightning truck motor, which is a good way to go. For a better experience, please enable JavaScript in your browser before proceeding. GT40Ps have 58cc. This time around, we chose a shining example of this junkyard art form. The action you just performed triggered the security solution. Along with the heads, we used MAC headers for GT-40P heads. 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. They work, but present their own challenges. Depending on the Headers you have you might be okay. $169.50. If you dont feel comfortable doing this higher a pro. Weiand 7515 xcellerator intake. Perhaps even more surprising was how well this engine idled, calmly purring with 16 inches of manifold vacuum at 980 rpm. .. i would not buy valves unless you need them amd would not switch to studs with these heads for your low hp . REMANUFACTURED FORD 302 5.0 COBRA GT40 CYLINDER HEADS. 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. 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. Every thing he tells you on this site is true. Actually, making around 240 to 250 hp with a near-stock Windsor 302 will feel pretty good. I was thinking the same but the enforcers are $647ea now so $1400 (inc tax) is the entry price for good set of heads. The rest went very smoothly, and we reused the stock lifters and suffered no ulcers worrying about breaking in the cam. 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. For a better experience, please enable JavaScript in your browser before proceeding. Stock 1989 5.0L HO pistons will work if you can find them. Related Resources Mustang Generation Nicknames: What Do They Mean? Since 2003, Jeff has held various positions at Car Craft (including editor), has written books on small block Chevy performance, and even cultivated an impressive collection of 1965 and 1966 Chevelles. 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. With nitrous, this is easily a mid-11-second ride. Buy the lifters for peace of mind now and hopefully for the duration. Stock valve sizes? Ported Hurricane Single Plane and custom 750 HP. Test 2: Changed to the smaller of the two Lunati camshaftsno other changes. Install a set of 1.7:1 roller-tipped rocker arms on the heads. 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. Very true about finding them at the local yards. Step 1. 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. I have a 432 HP non Hi Po 289 I built. GT 500; Posts: 8496; Location: Brisbane . Theres many options available for a little more power. That's fantastic for the minimal investment we made. Even with a stock Mustang 5.0 cam makes good power. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. the springs are new stock oem ford. If you can get the mentioned GT-40 heads with studs for a good price, that would be good for you. This is a function of the somewhat wider lobe-separation angle of 112 degrees. The GT40P heads had a small combustion chamber ranging from 58-61cc while the GT40 heads had a 63-66cc combustion chamber. Good on ya Jeff Smith. Manual trans. Anyways, I know the gt40ps will bump . this head fits years 95-01 explorer mountaineer mercury mountaineer . never messed with the timing, its at 35* total . With the P-heads requiring pedestal-mount rockers, we also called up Crane Cams for a set of 1.6 pedestal-mount roller rockers. Stock 93-95 Cobra shortblock (stock cobra cam), GT40X heads, 1.7 rockers, Edelbrock Performer RPM intake, Holley 650, and longtube headers. As with Chevrolet's small-block engine, the aftermarket has had dozens of years to expand the range and reduce the cost of the parts they offer for this engine. Yeah, except those. a) ain't early and b) aren't 289 heads. - I have a 1989 f150 with a 302 5 spd. Jeff Smith: It would have been better to know a little bit more about your combination, but the short answer is yeswith a hydraulic roller camshaft, assuming the lifters are in good shape and the roller wheels show no unusual wear, they can be re-used on a new cam with no danger of adverse effects. how much HP and torque? 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. When compared to the new generation of performance engines on the market today like the 5.0L DOHC Coyote engine, your engine will not come close. Ford Factory 5.0 Performance Cylinder Heads. 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. #1:::Throw out all your Magazines that suggest what to do! However there are plenty of factory heads that with the help of an experienced machine shop can be great. You just want to keep it out of detonation. Check my post above. Assemble the rotating assembly with a stock 5.0L crankshaft, a set of 5.0L rods and the specified pistons with stock-type rings. Come join the discussion about restoration, modifications, NOS parts, troubleshooting, VIN codes, and more! 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. Maybe I'll think about a cam swap? Ford GT40P 302 5.0L 4 Bar Cylinder Head Assembly Pair w/ 1/2" Head Bolt Hole. 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. Keep in mind that swapping camshafts is a fairly extensive effort. Is asking advice for a fairly common situation involving parts with mandatory compatibility between the two for performance and longevity. Long tube headers are a terrific idea, but you need to open up the exhaust side. (Please note these are not GT40P Explorer heads). Smith began writing for Car Craft magazine in 1979 and became editor in 1984. 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. You could run a thinner head gasket as well. Ive been building ENGINES for 40+ years. Don't let the fact that the iron GT40 heads have a larger exhaust valve fool you. A forum community dedicated to Ford performance owners and enthusiasts. 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While the heads were off getting a massage, we turned our attention to the cam timing. 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. 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! 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. Obviously, tuneups will vary. In order to make Coyote-type power you will need some expensive, high-flow cylinder heads with a short block that can withstand spinning in excess of 6,500 rpm. 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. In 1987, he assumed the role of editor for Hot Rod magazine before returning to his first love of writing technical stories. At the dragstrip, we gained two-tenths and 2 mph. The Fora platform includes forum software by XenForo. Central Coast Mustang sells GT-40P heads at a great price, making them a viable alternative in a market flooded with performance head choices. Definitely going to use my P heads. Choose a cylinder head before you install the pistons. 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 headers will improve this airflow throughout the entire rpm rangeadding more torque and horsepower. 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. Assuming the above configurationa pushrod 5.0L will potentially make between 250 and 260 hp. Yep my **** is coming apart again Isnt life great! Just make sure it is a roller cam. 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. For this reason, we're not sure what kind of boost the GT-40P heads will give. 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. Like I said lots of options. You will have to get special headers to fit these heads since the spark plugs are angled differently than normal 5.0 heads. The factory heads have a boss for the exhaust valve that restricts flow through the exhaust port. I have been working on Fords for 40 years and I have experimented with a few tricks of my own. For real performance, stock E7TE heads leave a lot to be desired. All costing in the end at least another $2k. Now we know why Dennis Hilliard of Central Coast Mustang is so high on these heads. SB Ford GT40P Drop In Valve Springs Kit, Hyd Roller w/ Stock Cam, .450" lift and below. 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.
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