That's a 40 per cent increase in power from a simple head and cam swap, and one seriously happy Mustang owner! Test 1: 750-cfm carburetor, dual-plane intake manifold, and stock camshaft. i've got a short block started, and i recently came across a set of GT40P heads for FREE ( love family members). 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. I have a very good running stock 1981 302 in a F100 short box. 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 Fora platform includes forum software by XenForo. Buy the lifters for peace of mind now and hopefully for the duration. You can find them on later model Mercury Mountaineers and several other Ford SUV applications. 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 Beyond the engine's amazingly good appearance, Moore had a couple of good reasons for choosing this engine. 68stang351 Founding Member May 16, 2002 850 Horse Sense: The smaller valves found in GT-40P heads improve airflow velocity. 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. Hey Motorheadty,Like your comments,question for ya,I have a 92 convertible,just bought a 5.0 out of a 94 gt that was just freshened up top end,gt40p heads w/new springs etc for the new E303 cam,new FRP roller lifters,Crane 1.7 rockers,hardened push rods,double roller timing set,all put on a bottom end w/104000 miles,needless to say previous owner pulled said engine after 800 miles and now building a 351,I pulled engine down my machinest,putting forged internals in and bolting everything back together,I want to run about a 150 shot N2o,and iam going carb,wondering which intake would be best w/the 150 shot,heard that dual planes might not be the way to go? Once you get into the FoMoCo aftermarket aluminum GT40s though, all bets are off. Took me 7 hours to do one head.but they cleaned up real nice. I am very happy too. If we subtract the 20 hp that the fan is worth, we end up with a gain of 25 hp. I'm wondering how these heads will interact with the paxton 1220 sl supercharger I'm trying to put on. A bone stock 2bbl early 351w with stock replacement forged pistons (9.0 compression) and dyno headers made 211 Hp . Calculated compression to 9.8:1. If you have a early 351W ie pre 76 it probably . Here a comparison of different heads on a 302: I'm very happy with my GT40P. The MPH was there to run a little better but the local track is about terrible. Jeff Smith has had a passion for cars since he began working at his grandfather's gas station at the age 10. Pride is built, in your garage, with your two hands. 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. For the first test, we were reusing the stock Explorer cam, so the engine didn't need any break-in time. There are literally a dozen or so camshaft companies that offer a mild hydraulic roller cam for a 5.0L Ford. Install a set of 1.7:1 roller-tipped rocker arms on the heads. Build Thread 1965 Fastback Project "Racesteed". 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. For a better experience, please enable JavaScript in your browser before proceeding. The gt40p head is considered the best OEM 302 head made. Click to reveal Don't let the fact that the iron GT40 heads have a larger exhaust valve fool you. In a lightweight Fox or early Mustang with a five-speed behind it, this would be a great little street engine. Stock valve sizes? This is needed for the steel roller cam. Nudge us with emails, and we'll make it happen. Location: Re: Stock Ford 351W 4bbl dyno numbers. We know what you're thinking--only two-tenths from an extra 45 hp? Well also assume that this engine is running stock exhaust manifolds. Well assume it is a 5.0L with stock heads. 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. There is a better way. They also have emissions legal heads as well. 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. This combination should be good for about 400 horsepower and as much as 500 if you opt to use the stronger aftermarket pistons. 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. Shop by category. 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. 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. Cast iron GT40Ps as cast flow better than non-Ps due to revised plug location/angle. You will have to address the 50 oz balance of the 5.0 engine by getting a 50 oz flywheel. All manufactured using advanced CNC technology for the extreme durability and precision required of the modern canted valve Ford Small Block at power levels around the 1000 mark reached during recent competitions at the EMC and at the strip. That's fantastic for the minimal investment we made. It has underdrive pulleys, MSD ignition, Bassanni headers and forward exit exhaust. GT40P heads, what kind of performance do they give? I have managed to get 402 horse power from a 289 hipo natural aspirated. 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). Once the headers are in place, then you can consider if you still want more power. Joined: Sun Mar 15, 2009 9:31 am. After graduating from Iowa State University with a journalism degree in 1978, he combined his two passions: cars and writing. Application Fits 1979-95 Mustang 302/351 w/ OEM Small Block Ford Heads But dont think that adding a bigger camshaft will make more power. In 1987, he assumed the role of editor for Hot Rod magazine before returning to his first love of writing technical stories. I'll prob take a trip up there this weekend after scavenging the junkyards, thanks a million. 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. (its not their engine) I was looking at putting on the GT40P heads on. Overview. Everything fits, use the stock rockers and pushrods. Really hurt too. If this is beyond your technical ability, you could ask a local machine shop to perform the modifications. The later model distributors had a different diameter shaft than the earlier ones. #2::: Get advice from a reptile engine builder with experience(first flag for me is when somebody refers to an ENGINE as a MOTOR! The tube headers showed a gain of almost 100 hp! Good Luck. 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. Small Block V8 (221, 260, 289, 5.0/302, 5.8/351W) - anyone have experience with GT40P heads on a 92 351W - ive got a 92 F250 with a 351W that needs a pretty serious rebuild. These engines came with the GT40P head, which even with its small valves, offers really good performance. are you twisted331 also? Test 3: Installed the larger Lunati camagain, no other changes. Install a Ford Motorsport E303, X303 or F303 cam, or any of the similar units from Indy, Lunati or your favorite manufacturer. Start with any 302 block, but try to find one from 1985 and up since it will already have provisions for a roller camshaft. Yeah, except those. a) ain't early and b) aren't 289 heads. Most of the time, GT-40 heads are worth a good 20-40hp over stock heads. Purchase any used aftermarket manifold for the 302 that is designed to function in the 3,500 to 6,500 power band. Sponsored. E303 Cam advanced 4 degrees. 1986 Short block with notched pistons. Do you guys have part numbers for the spring kits? The question was whether we wanted a torquey small-block or a more cammed-up rpm engine to boost peak horsepower. 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. JavaScript is disabled. by travis Sun May 03, 2020 8:33 am. Even with a stock Mustang 5.0 cam makes good power. This 1979-1995 Mustang cylinder head and camshaft guide will overview the heads and cams we offer and how they will coincide. 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. Assorted screwdrivers, pliers and vise-grips. This is the main reason why these engines are not modified as much as the small block Chevy. people can stop saying that adding aftermarket cam with stock heads is a waste of time. 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! The GT40P heads flow a lot better than stock 351 heads. Thank You. After a couple grand you have a killer set of heads, but there's got to be a less-expensive way of making horsepower. 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? Yes- thank you. 1983 Mustang G.T. So I've got the motor and heads already for my maverick project. Free shipping. . 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. Keep in mind that swapping camshafts is a fairly extensive effort. I'll save the effort and lighten my front end by 50# with aluminum. There are caveats to this plan, however. the springs are new stock oem ford. Both swaps made more sense when parts were readily available at the bone yard for cheap. Assuming the above configurationa pushrod 5.0L will potentially make between 250 and 260 hp. The HP DIFF column on the far right lists the horsepower difference between Test 1 and Test 3. In a 3,250-pound car like a Mustang with 3.50 gears and an automatic with a 2,800-rpm converter, this 5.0L could pull 12.80s at 108 mph. This will cost additional money but is still worth it, in our opinion. In addition, the cam timing was designed for torque, with duration somewhere around 190 degrees at 0.050 with roughly 0.450-inch lift. You didnt mention what camshaft you would be choosing or exactly which 5.0L Ford Windsor engine you are working with. 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. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. +1 I would go with the regular GT40 heads. I'm also have the regular GT40 heads on my current build. But the part about a cam replacement possibly being a labor intensive undertaking is correct. 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. Just make sure it is a roller cam. Over $2050 for the 165/185 renegades. Definitely going to use my P heads. That's an improvement of 22 hp over Test 2. We did a quick search for hydraulic roller cams and landed on a COMP camshaft that looked promising. 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. After we installed the heads and with the fan off, he ran a 12.46 at 107.9. 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. 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). A good port job can set you back another $500-$1,000. The car weighs #2835 with driver. You'll also have to use your 289 timing chain cover since it has a hole for the oil dip stick and fuel pump. For a better experience, please enable JavaScript in your browser before proceeding. 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. JavaScript is disabled. This will keep you from dropping your overall static compression ratio and losing power. Let us explain. Not to mention, they will run circles around GT40P's out of the box. If you know him, ask him. 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. 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. 1983 Mustang G.T. At the dragstrip, we gained two-tenths and 2 mph. 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. I view the GT40P heads similar to Granada brakes. Come join the discussion about popular models such as the Mustang, Galaxie, Falcon, Fairlane, Torino, Shelby and many more! $169.50. 1979 Indy 500 Pace Car. The Edelbrock Performer RPM is a good choice, but Holley, Weiand and Ford Motorsport also have similar offerings. Like I said lots of options. Well offer one as an example. REMANUFACTURED FORD 302 5.0 COBRA GT40 CYLINDER HEADS. 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. Shop by category. There was an article in Hot Rod magazine in the mid '80's where Jon Kaase was developing 351w packages. JavaScript is disabled. On slicks the car went some low 7.70s right at 90mph. $700.98. Yea. For real performance, stock E7TE heads leave a lot to be desired. 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. 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. GT40, GT40P, would be great factory heads. 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. Rowe studied engineering, philosophy and American literature at Central Florida Community College. 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. 5 letter words with ou ending in d,
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