It's a classic move we've pulled off many times. I added a link to it. A forum community dedicated to Ford performance owners and enthusiasts. The engine never huffed oil out of the breathers, and the spark plugs all looked excellent. I turned it because it was tired when I got it. Sponsored. You can have your current 28 oz rebalanced to 50. A COMP hydraulic roller cam we found works well with this combination. 68 XR7 & 68 M-100. 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. I went to a couple in Tucson and almost all the Ford vehicles that came with a 5.0 had the heads missing. Related Resources Mustang Generation Nicknames: What Do They Mean? 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. Eldelbrocks Air Gap intake manifold should work well with the combination. Check my post above. We set the timing to 34 degrees and rejetted the carburetor to get our desired 12.5:1 air/fuel ratio. Assorted screwdrivers, pliers and vise-grips. You keep stock drivability, and stock gas milage if you can stay out of boost. Test 2: Changed to the smaller of the two Lunati camshaftsno other changes. A LOT of them do it these days. 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. Consider having the head's intake ports matched to the intake manifold gasket. The engine was only rated at 215 hp, but it at least had 9.0:1 compression. The reply has so many assumptions that I cant even assume to know the answer. The valve seats have been cut on a . I don't need tons of power to enjoy the car. What did the heads flow? When you purchase through links on our site, we may earn an affiliate commission, which supports our community. 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. Plus you will need to drill all the head bolt holes out as the 351W uses larger head bolts. 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. These are some of the pictures I have showing the Explorer manifolds. I got a GT40P off the assembly line years ago. Yeah, out of a bolt on upgrade, you'd probably be looking at 260-280rwhp ish with supporting mods. 69-70 302 heads (the ones with the heart-shaped combustion chamber) Any early 289 heads for the chamber size (but you'll have small ports & valves w/all that CR) Flat Ernie, Aug 27, 2011 SHARE POST #8 fordfan289 Member from indiana correct me if Im wrong but cant you use 351c heads and get the same thing as a 302 boss. I'm wondering how these heads will interact with the paxton 1220 sl supercharger I'm trying to put on. For this reason, we're not sure what kind of boost the GT-40P heads will give. We gained 45 hp and 40 lb-ft of torque. 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. how hard to put on? You will have to get special headers to fit these heads since the spark plugs are angled differently than normal 5.0 heads. 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 newer camshaft is designed for use with a soft bronze distributor gear, not the hardened steel gear used for older camshafts. The tube headers showed a gain of almost 100 hp! 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. GT40, GT40P, would be great factory heads. Install a Ford Motorsport E303, X303 or F303 cam, or any of the similar units from Indy, Lunati or your favorite manufacturer. 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. For a better experience, please enable JavaScript in your browser before proceeding. However I think the opportunity window is slowly closing. 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. Ive been building ENGINES for 40+ years. . Most all long tubes come out far enough to clear and other short tube headers will work but there is clearance issues on two of the cylinders. This 1979-1995 Mustang cylinder head and camshaft guide will overview the heads and cams we offer and how they will coincide. I'm using the Trick Flow stage 1 cam with 1.7 roller rockers. We did the installation at Holten's place of employment, Motorworks, in Longwood, Florida. 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. Your IP: The factory heads have a boss for the exhaust valve that restricts flow through the exhaust port. The "P" heads flow better. A good port job can set you back another $500-$1,000. Its NA but makes use of AFR heads and some other aftermarket goodies. 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! Can I run the new cam with the same roller hydraulic lifters or do I have to change the lifters too? Well that article just got me very ancy, I want these heads!! At the dragstrip, we gained two-tenths and 2 mph. many thanks to all you eco-hippies giving me dirty looks and helping me feel llike an overall badass rebel. Maybe I'll think about a cam swap? 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. 1985 Mustang GT Mild 331 4bbl 5 spd, 1985 SEFI LTD LX AOD. 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. Yes- thank you. That said there are some better aftermarket options for heads also. Because of this, your tuneup will probably need to be modified. Also, you'll need to get a steel distributor gear to replace the iron gear that is currently on your distributor. You will have to address the 50 oz balance of the 5.0 engine by getting a 50 oz flywheel. Going from your heads to the GT40p heads will bump your compression by about a point.so hello bottom end torque. The later model distributors had a different diameter shaft than the earlier ones. I guess someone could just do a basic valve job and throw on the GT40 upper/lower intake for a cheap HP boost. The hardest part of swapping the cam was just getting the timing cover off and back on again. Where they differ is the combustion chamber size. When combined with modern power-makers, such as nitrous, the 302 is more than capable of producing 400+ horsepower for little more than the cost of a stock engine rebuild. 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. JavaScript is disabled. GT40s have 64cc chambers. That's fantastic for the minimal investment we made. The reason for this is that we're actually replacing mildly worked E7TE heads. I love my setup and it is very strong engine. Actually, making around 240 to 250 hp with a near-stock Windsor 302 will feel pretty good. The Fora platform includes forum software by XenForo. Please include what you were doing when this page came up and the Cloudflare Ray ID found at the bottom of this page. .. i would not buy valves unless you need them amd would not switch to studs with these heads for your low hp . 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. In 1987, he assumed the role of editor for Hot Rod magazine before returning to his first love of writing technical stories. made more power everytwhere and 40 hp is respectable. This is an older thread, you may not receive a response, and could be reviving an old thread. If you have a early 351W ie pre 76 it probably . Shop by category. So . If you can get the mentioned GT-40 heads with studs for a good price, that would be good for you. There are a couple of reasons for this suggestion. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. But the part about a cam replacement possibly being a labor intensive undertaking is correct. If we subtract the 20 hp that the fan is worth, we end up with a gain of 25 hp. that is a healthy budget deal. FULL DYNO RESULTS. I think one of the finer traits of a true car guy, is the patience to put a prized car away and just let it sit for a while rather than selling it when life gets in the way. 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. Don't let the fact that the iron GT40 heads have a larger exhaust valve fool you. Long tube headers are a terrific idea, but you need to open up the exhaust side. Despite adding 30 degrees of intake duration, this cam improved torque throughout the entire test from 3,000 rpm on up. The Fora platform includes forum software by XenForo. $700.98. For 2018, the Coyote makes 460 hp. The headers will improve this airflow throughout the entire rpm rangeadding more torque and horsepower. 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. Just got through porting one of my gt40p heads today. The heads that were used were also old C8 casting with 58cc chambers. This is needed for the steel roller cam. Skip to main content. Here is the lowdown on exhaust manifolds and VALVE SPRINGS. 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. Headers and a camshaft will help but the engine really needs aftermarket 3/8 inch connecting rod bolts and aftermarket cylinder heads. 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. Im now thinking of adding a cam to match the carb. In mid-1997, the Explorer and Mountaineer 5.0 L heads were revised and renamed . Ford GT40P 302 5.0L 4 Bar Cylinder Head Assembly Pair w/ 1/2" Head Bolt Hole. This one added another 10 degrees of duration over the smaller Voodoo cam, along with 0.020 inch more intake valve lift. Stock 1989 5.0L HO pistons will work if you can find them. Free shipping for many products! If this is beyond your technical ability, you could ask a local machine shop to perform the modifications. Like I said lots of options. REMANUFACTURED FORD 302 5.0 COBRA GT40 CYLINDER HEADS. Install a set of 1.7:1 roller-tipped rocker arms on the heads. Instructions on porting the GT-40p heads here. There are literally a dozen or so camshaft companies that offer a mild hydraulic roller cam for a 5.0L Ford. 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. These timeslips are from 1280' above sea level. Ford's seminal 302 engine (later re-dubbed the 5.0) has been popular with budget-minded hot rodders for decades. Some ideas never go out of style. This website is using a security service to protect itself from online attacks. You didnt mention what camshaft you would be choosing or exactly which 5.0L Ford Windsor engine you are working with. 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. (Please note these are not GT40P Explorer heads). 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. this head is complete with new 1.837 int valves and 1.536 exhaust valves. Definitely going to use my P heads. 1979 Indy 500 Pace Car. $930.00 + $55.00 shipping. I was looking at putting on the GT40P heads on. It runs smooth but seems lazy. Even with a stock Mustang 5.0 cam makes good power. Just make sure it is a roller cam. Your email address will not be published. With the tuning finalized, the little cam made far more power than we expected, cranking out 328 lb-ft of torque at 4,200 and 294 hp at 5,400 rpm. The GTp heads are like GT 40's with smaller combustion chambers and the spark plugs are relocated for a more efficient burn. 1 - 7 of 7 Posts. This will cost additional money but is still worth it, in our opinion. All Ford Mustangs | Model Specific Forums, GT-40P Heads - 5.0 Mustang & Super Fords Magazine. Vehicle: 1972 2 door 302 maverick, 1986 5.0 stang gt convertible,66 mustang coupe, HEMI ram. PTP Engineering front suspension and 25540R17s all around. Our recommendation would be, rather than change the camshaft, you might want to look into adding a set of long-tube headers and a dual exhaust if the engine is not already so equipped. Features hardened 4140 Chromoly retainers, valve locks, spring shims, a spring height gauge, valve seals, and instructions. For the first test, we were reusing the stock Explorer cam, so the engine didn't need any break-in time. We also added a veteran Ford magnetic pickup distributor and used it to drive an MSD ignition system. Last Edit: January 18, 2015, 12:05:31 pm by businesstrader Logged shaunp. Nice to see actual dyno results instead of "butt dyno" guesses. the springs are new stock oem ford. Because its all been done time after time after. Take the assembly to a machine shop to have it balanced and install it in the block. I had those on my car before I upgraded and they were nice heads. Win or lose, if you buy the ticket you must take the ride. AFR 165cc 58cc Heads. These are Ford iron GT-40P heads. This time around, we chose a shining example of this junkyard art form. Holten tells us removing the fan is worth two-tenths in itself, which tells us the fan soaks up roughly 20 hp. 302 explorer short block with roughly 80k miles GT40's from a local u pull n pay ($97) weiand x-celerator trick flow stage 1 cam 650 holley double pumper car made 322/329 SAE . All this is worth it. No-option stripper- I like strippers. For a better experience, please enable JavaScript in your browser before proceeding. Performance & security by Cloudflare. Shop by category. how much HP and torque? You'll have to plug the oil hole that is in the engine from the old oil dipstick. We did a quick search for hydraulic roller cams and landed on a COMP camshaft that looked promising. Step 2. Those are really good numbers. We didn't increase the valve size, although we did have to add Manley valves to get the proper spring-installed height. 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). I've not seen a set of longtubes that have an issue with GT40P's, either. +1 I would go with the regular GT40 heads. are you twisted331 also? Would have liked to see a comparison done on the same short block using a set of decently-ported early non-Thermactor iron heads Tracy Blackford, 65 Mustang FB, 331 built with 289 H beam rods and 383W piston, 282S cam, self ported '70 351w heads, Dougs Tri-Y headers. I have to agree, the GT40P heads flow better than the GT40 iron heads. We compare the GT40s to modern cylinder heads as well as other heads from the era. 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. They work, but present their own challenges. The combination of this cam with your intake and headers will produce a very nice street engine. Central Coast Mustang sells GT-40P heads at a great price, making them a viable alternative in a market flooded with performance head choices. I had a set of 69 302 heads I ran for a while . Perhaps even more surprising was how well this engine idled, calmly purring with 16 inches of manifold vacuum at 980 rpm. I'm also have the regular GT40 heads on my current build. 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. The cost of a new set of standard replacement roller lifters is very affordable at major retailers like Summit. Best of all, no machining is required to install these on your stock cast iron heads! With gt40p heads and 289 hipo exhaust manifolds changing sparkplugs is the same as the original 302 heads and manifolds, I use the spark plugs that are recomended for the explorer with gt40p heads and you can use straight or angled boots. Small Block V8 (221, 260, 289, 5.0/302, 5.8/351W) - GT40P heads? VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. fuel injection system . 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! I am very happy too. You can use the stock roller lifters with any size cam you want. Advanced: Daily Deals; Help & Contact; Sell; My eBay Expand My . We were cruising the 'yard a while back and located a 2000 Ford Explorer with an EFI 5.0L V-8 engine. HiPo manifolds and Ill be good. I need that part number too! I got lucky and found a complete Explorer GT40P engine online. I have a 5.0 from a 1992 Mustang in my 65. 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. #2::: Get advice from a reptile engine builder with experience(first flag for me is when somebody refers to an ENGINE as a MOTOR! I can tell you that with my 9.503 block, 22cc dished pistons and 64cc heads, I'm at 9.5:1 compression. 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. Not sure about that but got some pictures of the cast iron explorer manifolds on a 302. For all of us interested in Gt40p heads. 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. It turned out we were conservative on both counts. I'm an old school guy (289 in 65 mustang), and I'm just looking into the new 5.0 engine (roller cam) stuff recently. That's an improvement of 22 hp over Test 2. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. '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 87-93-95 Ford Mustang GT40P Engine Cylinder Heads REBUILT 302 351 GT40 SBF OEM | eBay Motors, Parts & Accessories, Car & Truck Parts & Accessories | eBay! This pushed that little Ford to a peak horsepower of 503, and that was where we stopped. 302 .030 over with; Scat Forged Steel Rods, SpeedPro pistons and rings . The heads also required some machine work, including screw-in studs, guideplates, and widening the spring pockets for bigger valvesprings. I guess I had it backwards, sorry about that, didn't mean to spread misinformation. If the head bolt holes are 1/2" or slightly larger, ARP makes the washers and can be sourced from Ford Racing or ARP through a speed shop or Summit, Jegs and PAW among others. Yeah, except those. a) ain't early and b) aren't 289 heads. 402 HP NA from a HI PO 289 isnt that mysterious of a feat to accomplish with todays SBF Aftermarket parts availability. There are several actions that could trigger this block including submitting a certain word or phrase, a SQL command or malformed data. bmcdaniel, Feb 17, 2004 #7. v8maverick Member. On the power side, we selected 400 hp as an impressive but reasonable output for our small-block 5.0L Ford. The rest went very smoothly, and we reused the stock lifters and suffered no ulcers worrying about breaking in the cam. The GT40P heads had a small combustion chamber ranging from 58-61cc while the GT40 heads had a 63-66cc combustion chamber. With the engine reassembled, we boxed up our second camshaft and headed for Westech's dyno. LOW-BUCK 302 FORD HEAD UPGRADE Richard Holdener 239K subscribers 189K views 2 years ago WESTECH PERFORMANCE GROUP WHAT'S IT WORTH? 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. An aggressive cam will wake it up a bit. Within a few hours of his discovery, the engine was sitting in the back of his truck on its way to a new home. 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 Yep my **** is coming apart again Isnt life great! 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. Boy, were we surprised with the results. SB Ford GT40P Drop In Valve Springs Kit, Hyd Roller w/ Stock Cam, .450" lift and below. 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. Install a used set of 5.0L Mustang "shorty" headers, generally available at auto swap meets for a reasonable price. The Fora platform includes forum software by XenForo. 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. Yea. The MPH was there to run a little better but the local track is about terrible. Common sense would suggest that with the heavy lifting complete and the old cam removed, by not installing the new roller lifters along with the camshaft could be asking for the possibility of trouble just a few thousand miles down the road. i have a 302 engine from a 1977 granada and i am wondering if gt40p heads from an explorer will fit on this motor. I plan on running a AFM b31 cam too which has relatively small duration for the intake valve. check out the. I was thinking the same but the enforcers are $647ea now so $1400 (inc tax) is the entry price for good set of heads. 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. I just read about this build on the corral.net. Required fields are marked *. Stock valve sizes? What you are trying to do is to increase the amount of airflow through the engine in order to make more power. If you can find individual flanged headers like the obsolete MAC headers had, those worked really well with GT40P's. just curious. The gt40p head is considered the best OEM 302 head made. After we installed the heads and with the fan off, he ran a 12.46 at 107.9. This is what I recommend to everyone who is doing a budget 5.0 build. 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. 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. hole size 302 is 7/16 and 351 is 1/2 However, stepping up in the performance head market will set you back more than $1,200 for a decent pair of aluminum castings--and that's straight out of the box, with no porting. The heads got a 3 angle valve job, new valves from speed-pro and all the valve train was from crane that matched the current hydraulic cam. 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. THANKS VERY MUCH! The longer duration created a slight loss of torque below 3,300 rpm compared to both previous cams, but beyond that mild loss of power, the bigger Voodo out-powered its smaller cousin, cranking out a peak torque of 355 lb-ft at 4,300 (a gain of 7 lb-ft over Test 2) and charging to a peak horsepower of 376 at 6,000 rpm. The asterisk HP differences are calculated using Test 1's 294-hp peak. Is asking advice for a fairly common situation involving parts with mandatory compatibility between the two for performance and longevity. 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. 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. 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. Tim's junkyard refugee survived the beating and we had a bitchin' story. You can have your current 28 oz rebalanced to 50.