These are some of the best castings Ford ever produced for this engine, and are still fairly cheap and available used.
99 Explorer engine (302) with GT40P heads - Ford Muscle Cars Tech Forum LOW-BUCK 302 FORD HEAD UPGRADE - YouTube You might even say its like flogging a dead horse without any animals actually being injured during my moments of sarcasm. If this is beyond your technical ability, you could ask a local machine shop to perform the modifications. 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. Finding Gt40p heads at the junkyard is getting more and more complicated and if you want to upgrade the heads you have to take into account the costs of the machine shop and compare everything to a set of cheap aluminum heads. Install a used set of 5.0L Mustang "shorty" headers, generally available at auto swap meets for a reasonable price. Here is my setup. The gt40p head is considered the best OEM 302 head made.
331/347 stroker w/gt40p's, waste?Hp?cost involved? - Maverick We gained 45 hp and 40 lb-ft of torque. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. HiPo manifolds and Ill be good. 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. 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. Test 3: Installed the larger Lunati camagain, no other changes. fuel injection system . 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 Fora platform includes forum software by XenForo. Yes Mr.Smith, your column here at OAC adorned with extreme performance without power adders, or all Engine as its known, from a superior pushrod Small Block featuring almost all USA sourced modern components with the familiar smell of Ford Blue. Stock 1989 5.0L HO pistons will work if you can find them. 1.7 shaft rockers and beehives. Ford GT40P 302 5.0L 4 Bar Cylinder Head Assembly Pair w/ 1/2" Head Bolt Hole. Over $2050 for the 165/185 renegades. I wouldnt recommend reusing lifters though. Depending on the Headers you have you might be okay. hole size 302 is 7/16 and 351 is 1/2 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. You can use the stock roller lifters with any size cam you want. Despite adding 30 degrees of intake duration, this cam improved torque throughout the entire test from 3,000 rpm on up. In a lightweight Fox or early Mustang with a five-speed behind it, this would be a great little street engine. $169.50. That's an improvement of 22 hp over Test 2. 1986 Short block with notched pistons. 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.
Add 40 to 70 HP to your 302 yourself - Factory Five Racing Forum This needs to be removed and different exhaust valves, retainers, and valve springs added to turn this into a decent street head. 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. Im now thinking of adding a cam to match the carb.
302HO with gt40p heads | Mustang Forums at StangNet Not looking for crazy HP. We heated the bottle to 950 psi and hit the button at 4,500 rpm. 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. There are a couple of reasons for this suggestion. We did the installation at Holten's place of employment, Motorworks, in Longwood, Florida.
351W D0OE-C heads better than GT40P\'s? - Ford Muscle Cars Tech Forum Some ideas never go out of style. Im a different animal. #1:::Throw out all your Magazines that suggest what to do! The SUV indicated barely 120,000 on the clock, and after yanking the valve covers to judge the engine's condition, Tim Moore instantly made the decision to do the boneyard version of a smash-and-grab. We need a build on a 400+ hp 302/6 build. 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. And remember ENGINES have been being built/rebuilt/modified for years. T5 with 3.73s. All this is worth it. people can stop saying that adding aftermarket cam with stock heads is a waste of time. The spark plug issue is almost a non-issue.
GT-40P Heads - 5.0 Mustang & Super Fords Magazine - MotorTrend 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. 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. What you are trying to do is to increase the amount of airflow through the engine in order to make more power. Do not ever, ever think about using the tube type manifolds. However, theres a distinct possibility that I might pull all of my hair out if I see another in-depth article explaining how I, along with just over a billion other desperate humans seeking answers, need special valve spring split locks for my next tired Chevy build. 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. Even with a stock Mustang 5.0 cam makes good power. I view the GT40P heads similar to Granada brakes. That carbureted GT40P motor made 465 on th engine dyno with a .500" 239/244 camshaft, Holley 650 carb and Weiand Stealth intake. GT 500; Posts: 8496; Location: Brisbane . 302 .030 over with; Scat Forged Steel Rods, SpeedPro pistons and rings . Nudge us with emails, and we'll make it happen. The car weighs #2835 with driver. Perhaps even more surprising was how well this engine idled, calmly purring with 16 inches of manifold vacuum at 980 rpm. First, adding headers will improve power on the existing combination. Scorpion 1.6 roller rockers. I have a very good running stock 1981 302 in a F100 short box. These are Ford iron GT-40P heads. Definitely going to use my P heads. many thanks to all you eco-hippies giving me dirty looks and helping me feel llike an overall badass rebel. You can find them on later model Mercury Mountaineers and several other Ford SUV applications. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. 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.
REMANUFACTURED FORD 302 5.0 COBRA GT40 CYLINDER HEADS | What's New 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. Tim's junkyard refugee survived the beating and we had a bitchin' story. 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. Add a distributor designed for a carbureted 302 but make sure to install the correct distributor gear for your cam.
gt40p heads on a 289 in a 66 | Vintage Mustang Forums No-option stripper- I like strippers. 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. If I get different urges later, Ill pursue those then. This is needed for the steel roller cam. 402 HP NA from a HI PO 289 isnt that mysterious of a feat to accomplish with todays SBF Aftermarket parts availability. This 1979-1995 Mustang cylinder head and camshaft guide will overview the heads and cams we offer and how they will coincide. 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). I have a 5.0 from a 1992 Mustang in my 65. Im new and Im 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. We also added an Edelbrock Performer RPM dual-plane intake and a set of 158-inch headers with no mufflers. Both swaps made more sense when parts were readily available at the bone yard for cheap. The factory heads have a boss for the exhaust valve that restricts flow through the exhaust port. The rest went very smoothly, and we reused the stock lifters and suffered no ulcers worrying about breaking in the cam. JavaScript is disabled. Aside from the cost of the nitrous itself, this setup should cost you little more than a stock rebuild using all brand new parts. +1 I would go with the regular GT40 heads. A COMP hydraulic roller cam we found works well with this combination. It turned out we were conservative on both counts. that is a healthy budget deal. Actually, making around 240 to 250 hp with a near-stock Windsor 302 will feel pretty good. I spin it to 6500 and thats about it. bmcdaniel, Feb 17, 2004 #7. v8maverick Member. Good on ya Jeff Smith. They work, but present their own challenges. There is a better way. Yeah, out of a bolt on upgrade, you'd probably be looking at 260-280rwhp ish with supporting mods. This combination should be good for about 400 horsepower and as much as 500 if you opt to use the stronger aftermarket pistons. Over $2050 for the 165/185 renegades. check out the. Depends on the budget. Rowe studied engineering, philosophy and American literature at Central Florida Community College. Not bad for off the shelf parts and a stock shortblock. The "P" heads flow better. The GT40P cylinder heads had a small combustion chamber ranging from 58-61cc while the GT40 heads had a 63-66cc combustion chamber. I need that part number too! 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. 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. The GTp heads are like GT 40's with smaller combustion chambers and the spark plugs are relocated for a more efficient burn. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada.
GT40P heads? how hard to put on? how much HP and torque? Not sure about that but got some pictures of the cast iron explorer manifolds on a 302. These are among the best of the iron Ford Windsor heads as they tend to flow much better than earlier castings. I've got gt40p heads for it I'll be running, and can't afford better . This time around, we chose a shining example of this junkyard art form. Then why did you port the heads and how do you know if you made an improvement. Have fun, be safe, enjoy. 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. 68stang351 Founding Member May 16, 2002 850 made more power everytwhere and 40 hp is respectable. The entire front accessory drive and timing chain cover must be removed, along with the distributor and intake manifold. We turned to Rare Auto Design in Orlando for dyno tests to find out how much horsepower we gained. However realistically, with the amount of money spent modifying the gt40p heads or even those older 289 & 351w heads, you could have even better performing aluminum heads. This pushed that little Ford to a peak horsepower of 503, and that was where we stopped. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); This site uses Akismet to reduce spam. After we installed the heads and with the fan off, he ran a 12.46 at 107.9. any input is apprecciated:smartass: Thank you for the info, if all I have to worry about is the plugs then I'm in good shape hahaha. The GT40P heads had a small combustion chamber ranging from 58-61cc while the GT40 heads had a 63-66cc combustion chamber. 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. If you can get the mentioned GT-40 heads with studs for a good price, that would be good for you. this head is complete with new 1.837 int valves and 1.536 exhaust valves. 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. GT40, GT40P, would be great factory heads. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. The only way to really make more power is to go with a stroker kit, blower and/or heads. Building a 302-inch small-block to produce 400 hp is really no big deal, but doing. Well also assume that this engine is running stock exhaust manifolds. 87-93-95 Ford Mustang GT40P Engine Cylinder Heads REBUILT 302 351 GT40 SBF OEM | eBay Motors, Parts & Accessories, Car & Truck Parts & Accessories | eBay!
Understanding Ford's Fox Body GT40 Cylinder Heads - CJ Pony Parts I don't need tons of power to enjoy the car. Can I run the new cam with the same roller hydraulic lifters or do I have to change the lifters too? The heads also required some machine work, including screw-in studs, guideplates, and widening the spring pockets for bigger valvesprings. I'll save the effort and lighten my front end by 50# with aluminum. Cant wait to try um out. Now we know why Dennis Hilliard of Central Coast Mustang is so high on these heads. Also, you'll need to get a steel distributor gear to replace the iron gear that is currently on your distributor.