Not looking for crazy HP. . Learn how your comment data is processed. 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. Is asking advice for a fairly common situation involving parts with mandatory compatibility between the two for performance and longevity. How much HP and torque do you think I. Mac and Ford Motorsport both make a GT40P spacific header. Free shipping. This is not a criticism but instead consider it to be more of a heads-up. That's an improvement of 22 hp over Test 2. If I remember right, non of the GT40P's (later models) had the thermactor smog provisions. 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. Stock 1989 5.0L HO pistons will work if you can find them. United Engine and Machine sells cheap but decent pistons that will do what you're wanting. Now he serves as a regular contributor to OnAllCylinders. You could run a thinner head gasket as well. Maybe I'll think about a cam swap? 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. Mar 23, 2004. Well assume it is a 5.0L with stock heads. A forum community dedicated to Ford Mustang owners and enthusiasts. The hardest part of swapping the cam was just getting the timing cover off and back on again. 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. But don't think that adding a bigger camshaft will make more power. I recall having an absolute blast with my old K-code coupe back in the day. . Well also assume that this engine is running stock exhaust manifolds. 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. 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 MPH was there to run a little better but the local track is about terrible. +1 I would go with the regular GT40 heads. REMANUFACTURED FORD 302 5.0 COBRA GT40 CYLINDER HEADS. That's more than enough to feed a power-brake booster. T5z and 3.89 9" TL rear. 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. On the power side, we selected 400 hp as an impressive but reasonable output for our small-block 5.0L Ford. Be careful, I was once bitten by one of those reptile engine builders. For the first test, we were reusing the stock Explorer cam, so the engine didn't need any break-in time. For both the GT40 and GT40p heads, I STRONGLY suggest upgrading the valve springs. Come join the discussion about restoration, modifications, NOS parts, troubleshooting, VIN codes, and more! 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. For a better experience, please enable JavaScript in your browser before proceeding. This modification will help your late-model GT40P heads work better with the old-school carbureted intake setup. Anythoughts? (Image/Harrison Creamery). . A forum community dedicated to Ford performance owners and enthusiasts. Ha! this head is complete with new 1.837 int valves and 1.536 exhaust valves. 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. If I get different urges later, Ill pursue those then. The GTp heads are like GT 40's with smaller combustion chambers and the spark plugs are relocated for a more efficient burn. Depends on the budget. The asterisk HP differences are calculated using Test 1's 294-hp peak. Early Windsors tend to have fairly restrictive exhaust manifolds, making the addition of a set of headers that much more efficient. So . 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. Depending on the Headers you have you might be okay. how hard to put on? SBF engines are modified constantly. Everything fits, use the stock rockers and pushrods. check out the. That's fantastic for the minimal investment we made. On slicks the car went some low 7.70s right at 90mph. 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. .. i would not buy valves unless you need them amd would not switch to studs with these heads for your low hp . 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. With the engine reassembled, we boxed up our second camshaft and headed for Westech's dyno. We know what you're thinking--only two-tenths from an extra 45 hp? Start with any 302 block, but try to find one from 1985 and up since it will already have provisions for a roller camshaft. ***Most important is theStupid question is the one that was never asked!*** Gasoline/Diesel all makes on earth & still doing it today with great pride.Feel free to contact me anytime. If you smooth out the bowls and exhaust ports and gasket match the intakes they should flow decent. ford 302 sbf gt40p v8 cast iron complete cylinder head and head bolts and head gasket set. You can have your current 28 oz rebalanced to 50. check out the. We will go into more detail on the head mods in a later story in Junkyard Builder, so watch for it. by travis Sun May 03, 2020 8:33 am. The engine never huffed oil out of the breathers, and the spark plugs all looked excellent. Free shipping for many products! Compare. I turned it because it was tired when I got it. GT40s have 64cc chambers. Someone does make the Tri-Y's headers for the early Mustangs using the "P" heads. fuel injection system . Sponsored. Ford's seminal 302 engine (later re-dubbed the 5.0) has been popular with budget-minded hot rodders for decades. They suffered from poor aftermarket support up until about 15 years ago when it really came on strong. Many years ago, a friend bought a used 2001 Mercury Mountaineer 5.0L that was equipped with a set of really decent GT40P style iron heads. It's a classic move we've pulled off many times. GT40p heads peak horsepower was [email protected] with 363ft/[email protected] The worked 351 heads showed peak . Yes- thank you. A mild porting with gasket matching will be very good. 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. - I have a 1989 f150 with a 302 5 spd. You didnt mention the car this engine is in, but lets assume there is enough room to remove the radiator and any other coolers and perhaps some or all of the front grille and/or brackets before the cam has sufficient room to exit the front of the engine. Let us explain. But dont think that adding a bigger camshaft will make more power. Test 3: Installed the larger Lunati camagain, no other changes. An aggressive cam will wake it up a bit. 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. 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! The valve seats have been cut on a . We compare the GT40s to modern cylinder heads as well as other heads from the era. With no other changes we gained 25 hp using factory iron heads. 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. Late-model ford GT40 and GT40P heads with 1.84-inch intake valves will also flow 185 cfm at 0.50 . Yeah, except those. a) ain't early and b) aren't 289 heads. The heads that were used were also old C8 casting with 58cc chambers. You can have your current 28 oz rebalanced to 50. Come join the discussion about performance, production numbers, VIN decoders, modifications, troubleshooting, power adders, DIY tutorials, and more! I have a 302 Windsor V8 EFI engine that I converted to a 600 cfm carburetor with a Street Warrior intake manifold. 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. Weiand 7515 xcellerator intake. Scorpion 1.6 roller rockers. The rest went very smoothly, and we reused the stock lifters and suffered no ulcers worrying about breaking in the cam. 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. These are Ford iron GT-40P heads. I have been working on Fords for 40 years and I have experimented with a few tricks of my own. FORD GT40p 4 BAR HEADS IN GOOD CONDITION . 1986 Short block with notched pistons. You just want to keep it out of detonation. The entire front accessory drive and timing chain cover must be removed, along with the distributor and intake manifold. Sponsored. Even with a stock Mustang 5.0 cam makes good power. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. 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. Never not once have I ever seen a SBF rod bolt create a failure. GT40Ps have 58cc. The GT40P cylinder heads had a small combustion chamber ranging from 58-61cc while the GT40 heads had a 63-66cc combustion chamber. 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. Beyond the engine's amazingly good appearance, Moore had a couple of good reasons for choosing this engine. This is needed for the steel roller cam. This needs to be removed and different exhaust valves, retainers, and valve springs added to turn this into a decent street head. There are too many variables to add to this regarding aftermarket stroker kits or components. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. With nitrous, this is easily a mid-11-second ride. (Please note these are not GT40P Explorer heads). Long tube headers are a terrific idea, but you need to open up the exhaust side. AFR 165 Heads | Have options for pedestal mounted rocker arms or stud mounted rocker arms. Instructions on porting the GT-40p heads here. They almost seem like flywheel numbers rather than RWHP numbers. They were located in Tahachapi CA, and were sold with upgraded springs for $650.00, back in 2002-2003 ish. this head fits years 95-01 explorer mountaineer mercury mountaineer . We did the installation at Holten's place of employment, Motorworks, in Longwood, Florida. The GT40P heads flow a lot better than stock 351 heads. This test went so well that we were eager to see what the slightly bigger cam would do. 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. JavaScript is disabled. We need a build on a 400+ hp 302/6 build. 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. At the time, I was still running smog equipment in a 1994 Mustang GT, so I had them drill the back of the heads for the thermactor connection. The heads also required some machine work, including screw-in studs, guideplates, and widening the spring pockets for bigger valvesprings. You will have to address the 50 oz balance of the 5.0 engine by getting a 50 oz flywheel. E303 Cam advanced 4 degrees. The kit offers adjustable power from 50 to 250 hp with a simple jet change. Not bad for off the shelf parts and a stock shortblock. The car weighs #2835 with driver. These timeslips are from 1280' above sea level. When building an engine there is a lot to take into consideration. 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. In a lightweight Fox or early Mustang with a five-speed behind it, this would be a great little street engine. Most of the time, GT-40 heads are worth a good 20-40hp over stock heads. With the P-heads requiring pedestal-mount rockers, we also called up Crane Cams for a set of 1.6 pedestal-mount roller rockers. You'll have to plug the oil hole that is in the engine from the old oil dipstick. 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. 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. BONUS TEST-FOUR DIFFERENT 302 INTAKES.. 1979 Indy 500 Pace Car. Compare. The engine was only rated at 215 hp, but it at least had 9.0:1 compression. that is a healthy budget deal. First, adding headers will improve power on the existing combination. Purchase any used aftermarket manifold for the 302 that is designed to function in the 3,500 to 6,500 power band. 97% Positive Feedback . K.S. '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 I must agree with Jeff Smith. Assorted screwdrivers, pliers and vise-grips. I plan on running a AFM b31 cam too which has relatively small duration for the intake valve. Do you guys have part numbers for the spring kits? So I've got the motor and heads already for my maverick project. The question was whether we wanted a torquey small-block or a more cammed-up rpm engine to boost peak horsepower. Please include what you were doing when this page came up and the Cloudflare Ray ID found at the bottom of this page. You gave me the info I was looking for, and I really do appreciate it. 68 XR7 & 68 M-100. A forum community dedicated to vintage Ford Mustang owners and enthusiasts. Where they differ is the combustion chamber size. This will cost additional money but is still worth it, in our opinion. We didn't increase the valve size, although we did have to add Manley valves to get the proper spring-installed height. As noted, this is looking like hes building a 351 Lightning truck motor, which is a good way to go. Dec 8, 2011. Well offer one as an example. I was thinking the same but the enforcers are $647ea now so $1400 (inc tax) is the entry price for good set of heads. No-option stripper- I like strippers. While we've seen engine dyno tests performed with GT-40P heads replacing factory E7TE castings and resulting in a boost of more than 25 hp, we have reluctantly set our horsepower gain goal at 25 ponies, as well. Thank You. Test 2: Changed to the smaller of the two Lunati camshaftsno other changes. I bought a crate 302 from Downs Ford a few years ago that was producing 320 hp. Ford GT40P 302 5.0L 4 Bar Cylinder Head Assembly Pair w/ 1/2" Head Bolt Hole. These are some of the best castings Ford ever produced for this engine, and are still fairly cheap and available used. At the dragstrip, we gained two-tenths and 2 mph. hole size 302 is 7/16 and 351 is 1/2 Save narve00 Just got through porting one of my gt40p heads today. fordfan289, Aug 27, 2011 A bone stock 2bbl early 351w with stock replacement forged pistons (9.0 compression) and dyno headers made 211 Hp . PTP Engineering front suspension and 25540R17s all around. Last Edit: January 18, 2015, 12:05:31 pm by businesstrader Logged shaunp. SB Ford GT40P Drop In Valve Springs Kit, Hyd Roller w/ Stock Cam, .450" lift and below. Add a distributor designed for a carbureted 302 but make sure to install the correct distributor gear for your cam. made more power everytwhere and 40 hp is respectable. 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. 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. Related Resources Mustang Generation Nicknames: What Do They Mean? I just read about this build on the corral.net. LOW-BUCK 302 FORD HEAD UPGRADE Richard Holdener 239K subscribers 189K views 2 years ago WESTECH PERFORMANCE GROUP WHAT'S IT WORTH? FULL DYNO RESULTS. I guess someone could just do a basic valve job and throw on the GT40 upper/lower intake for a cheap HP boost.
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