If you go with a diffrent cam, make sure you change springs, The Trick Flow kit comes with everything for around $130. When building an engine there is a lot to take into consideration. You will have to get special headers to fit these heads since the spark plugs are angled differently than normal 5.0 heads. 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. #3::: Do your homework,get quality parts,dont skimp. Your email address will not be published. I have a very good running stock 1981 302 in a F100 short box. You need to check. We turned to Rare Auto Design in Orlando for dyno tests to find out how much horsepower we gained. The factory heads have a boss for the exhaust valve that restricts flow through the exhaust port. (Please note these are not GT40P Explorer heads). I have a 5.0 from a 1992 Mustang in my 65. The dyno recorded a peak horsepower reading of 489 hp, but the air/fuel ratio was slightly on the rich side at 11.5:1, so we increased the nitrous jet to a 61 and hit the button again. 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. 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. Because of this, your tuneup will probably need to be modified. 68stang351 Founding Member May 16, 2002 850 If you know him, ask him. 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:?:!?!?!? You gave me the info I was looking for, and I really do appreciate it. Yes- thank you. For a better experience, please enable JavaScript in your browser before proceeding. 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. Car Craft mag. 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. 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. The GT40P heads flow a lot better than stock 351 heads. 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. Slover primarily focused on the exhaust side of the GT40P heads. 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. 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. We gained 45 hp and 40 lb-ft of torque. I view the GT40P heads similar to Granada brakes. For real performance, stock E7TE heads leave a lot to be desired. Through Central Coast you can have the heads fully prepped for your combination. You'll also have to use your 289 timing chain cover since it has a hole for the oil dip stick and fuel pump. Here is my setup. It turned out we were conservative on both counts. Mustang Cylinder Head & Camshaft Guide (79-95) - LMR He'll have to get a gear for his distributor. SBF engines are modified constantly. As with all head installations, check piston-to-valve clearance before final startup. Small-block Fords and Mopars only use four head bolts per cylinder, so retaining proper head-gasket sealespecially with nitrousis a point that demands attention, so we ordered a set of Fel-Pro MLS head gaskets rather than a standard, composition gasket. I plan on running a AFM b31 cam too which has relatively small duration for the intake valve. What you are trying to do is to increase the amount of airflow through the engine in order to make more power. There are a couple of reasons for this suggestion. Now he serves as a regular contributor to OnAllCylinders. I'm also have the regular GT40 heads on my current build. Boy, were we surprised with the results. Vehicle: 1972 2 door 302 maverick, 1986 5.0 stang gt convertible,66 mustang coupe, HEMI ram. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. Holley 670 street avenger carb. Runs well. Free shipping. Those heads were unported and had stock valve sizes! I'm sure the dyno operator used some goofball correction factor to make the numbers look higher. We did the installation at Holten's place of employment, Motorworks, in Longwood, Florida. Thank You. Test 1: 750-cfm carburetor, dual-plane intake manifold, and stock camshaft. I wouldnt recommend reusing lifters though. Just make sure it is a roller cam. GT40P heads, what kind of performance do they give? Joined . The engine never huffed oil out of the breathers, and the spark plugs all looked excellent. This is not a criticism but instead consider it to be more of a heads-up. With no other changes we gained 25 hp using factory iron heads. After we installed the heads and with the fan off, he ran a 12.46 at 107.9. We also added an Edelbrock Performer RPM dual-plane intake and a set of 158-inch headers with no mufflers. Compare. Im now thinking of adding a cam to match the carb. Calculated compression to 9.8:1. 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. many thanks to all you eco-hippies giving me dirty looks and helping me feel llike an overall badass rebel. Posted on May 07, 2014 by promarengine. Maybe I'll think about a cam swap? This pushed that little Ford to a peak horsepower of 503, and that was where we stopped. In a lightweight Fox or early Mustang with a five-speed behind it, this would be a great little street engine. Get 500 Horsepower from a Junkyard Ford Explorer 302 - MotorTrend Richard Rowe has been writing professionally since 2007, specializing in automotive topics. The rest went very smoothly, and we reused the stock lifters and suffered no ulcers worrying about breaking in the cam. SB Ford, GT40 .575" Lift Max Output II Drop in Valve Spring Kit, Hyd Roller, 140 Lb Seat. Do not ever, ever think about using the tube type manifolds. In addition, the cam timing was designed for torque, with duration somewhere around 190 degrees at 0.050 with roughly 0.450-inch lift. Smith began writing for Car Craft magazine in 1979 and became editor in 1984. Aside from the cost of the nitrous itself, this setup should cost you little more than a stock rebuild using all brand new parts. These are some of the best castings Ford ever produced for this engine, and are still fairly cheap and available used. You can email the site owner to let them know you were blocked. Eldelbrocks Air Gap intake manifold should work well with the combination. i've got a short block started, and i recently came across a set of GT40P heads for FREE ( love family members). These are among the best of the iron Ford Windsor heads as they tend to flow much better than earlier castings. But dont think that adding a bigger camshaft will make more power. Go for it if you get them super cheap and can get headers/manifolds super cheap as well but otherwise I'd say it's a waste of time and money. With nitrous, this is easily a mid-11-second ride. We will go into more detail on the head mods in a later story in Junkyard Builder, so watch for it. 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. They work, but present their own challenges. The question was whether we wanted a torquey small-block or a more cammed-up rpm engine to boost peak horsepower. Cloudflare Ray ID: 7a2e2d95dedea1e4 K.S. Its funny no one mentioned anything about ignition timing or components, Your email address will not be published. Most of them are aware of what changes need to be completed. Add a distributor designed for a carbureted 302 but make sure to install the correct distributor gear for your cam. 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. P-heads have a smaller combustion chamber at 59cc, which will bump the compression ratio up on an otherwise-stock 5.0 engine. 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. 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. Ford GT40P 302 5.0L 4 Bar Cylinder Head Assembly Pair w/ 1/2" Head Bolt Hole. In 1987, he assumed the role of editor for Hot Rod magazine before returning to his first love of writing technical stories. Speedmaster PCE281.2046 Small Block Ford Aluminum Cylinder Heads 62cc Be careful, I was once bitten by one of those reptile engine builders. A solid 300-325 hp should be plenty and that's with good drivability and reliability as well. Advanced: Daily Deals; Help & Contact; Sell; My eBay Expand My . Really hurt too. GT-40 heads HP increase | Mustang Forums at StangNet check out the. This engine will be good for your 65 Mustang. If you're not a header kind of guy, the repro 289 HIPO manifolds bolt up to the GT40P heads with plenty of spark plug room. 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. Nice to see actual dyno results instead of "butt dyno" guesses. Check my post above. Instructions on porting the GT-40p heads here. thats after 3 hours of idling/midrange hits to tune the idle and part throttle . Their weak point is that the rotator used on the exhaust valve is very thick. Actually, making around 240 to 250 hp with a near-stock Windsor 302 will feel pretty good. This website is using a security service to protect itself from online attacks. Cant wait to try um out. However I think the opportunity window is slowly closing. I have been working on Fords for 40 years and I have experimented with a few tricks of my own. I have to agree, the GT40P heads flow better than the GT40 iron heads. this head is complete with new 1.837 int valves and 1.536 exhaust valves. The Fora platform includes forum software by XenForo. That said there are some better aftermarket options for heads also. people can stop saying that adding aftermarket cam with stock heads is a waste of time. Every thing he tells you on this site is true. Choose a cylinder head before you install the pistons. HAD '82 GT monochromatic (red).black cloth HAVE 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 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. Sure, you could race-port the existing E7 castings, which many have done, but then you're putting quite a bit of change into stock heads. #2::: Get advice from a reptile engine builder with experience(first flag for me is when somebody refers to an ENGINE as a MOTOR! Headers and a camshaft will help but the engine really needs aftermarket 3/8 inch connecting rod bolts and aftermarket cylinder heads. Come join the discussion about restoration, modifications, NOS parts, troubleshooting, VIN codes, and more! 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. Or, you could invest in a new set of heads that would also do the same job but you can expect to spend quite a bit more money. If I get different urges later, Ill pursue those then. No-option stripper- I like strippers. (its not their engine) Keep in mind that swapping camshafts is a fairly extensive effort. Works on all factory cast iron E7, GT40, and GT40P cylinder heads! With the GT-40P heads you will need to back off the timing a couple degrees and bump up the fuel pressure. That's a 40 per cent increase in power from a simple head and cam swap, and one seriously happy Mustang owner! 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. I'm new and I'm 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. Even with relatively small valve sizes of 1.85-inch intake and 1.46-inch exhaust, the P-heads flow much better than previous. The only way to really make more power is to go with a stroker kit, blower and/or heads. Not looking for crazy HP. 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? 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. Build Thread 1965 Fastback Project "Racesteed". GT 500; Posts: 8496; Location: Brisbane . Everything fits, use the stock rockers and pushrods. GT40 Heads On A 289? | Ford Muscle Cars Tech Forum fuel injection system . Ford GT40P 302 5.0L 4 Bar Cylinder Head Assembly Pair w/ 1/2" Head Bolt Hole. Calculating pushrod length 302, GT40P Heads, E cam, 4 into 4, Holley 600, Mallory Unilite, Levy SD T5, 3.73, 15" Team III, firewall mod, trunk mod, trailer hitch, drivers foot box mod, front tow rings. If you have a early 351W ie pre 76 it probably . - I have a 1989 f150 with a 302 5 spd. 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. JEGS High Performance. 87-93-95 Ford Mustang GT40P Engine Cylinder Heads REBUILT 302 351 GT40 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. 1983 Mustang G.T. (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. However there are plenty of factory heads that with the help of an experienced machine shop can be great. 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. No-option stripper- I like strippers. Win or lose, if you buy the ticket you must take the ride. Purchase any used aftermarket manifold for the 302 that is designed to function in the 3,500 to 6,500 power band. They fill that spot between power and budget. Upgrading Fox Body Cylinder Heads - AmericanMuscle.com how much HP and torque? 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. Now we know why Dennis Hilliard of Central Coast Mustang is so high on these heads. 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. He'd be the best source. 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. A forum community dedicated to vintage Ford Mustang owners and enthusiasts. Start with any 302 block, but try to find one from 1985 and up since it will already have provisions for a roller camshaft.