For a better experience, please enable JavaScript in your browser before proceeding. The asterisk HP differences are calculated using Test 1's 294-hp peak. 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. Step 2. This needs to be removed and different exhaust valves, retainers, and valve springs added to turn this into a decent street head. Horse Sense: The smaller valves found in GT-40P heads improve airflow velocity. Thanks. Consider having the head's intake ports matched to the intake manifold gasket. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. 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? 87-93-95 Ford Mustang GT40P Engine Cylinder Heads REBUILT 302 351 GT40 SBF OEM | eBay Motors, Parts & Accessories, Car & Truck Parts & Accessories | eBay! 1985 Mustang GT Mild 331 4bbl 5 spd, 1985 SEFI LTD LX AOD. 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. 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. This is not a criticism but instead consider it to be more of a heads-up. Max hp out of gt 40 heads | Mustang Evolution Forum For this reason, we're not sure what kind of boost the GT-40P heads will give. Be careful, I was once bitten by one of those reptile engine builders. I recall having an absolute blast with my old K-code coupe back in the day. Its NA but makes use of AFR heads and some other aftermarket goodies. well i finally did my first ever carb build, ive always been an EFI guy Black 1985 GT: 408w, in the 6's in the 1/8 mile. anyone have experience with GT40P heads on a 92 351W Boy, were we surprised with the results. 1983 Mustang G.T. Cloudflare Ray ID: 7a2e2d95dedea1e4 check out the. They fill that spot between power and budget. If you go with a diffrent cam, make sure you change springs, The Trick Flow kit comes with everything for around $130. We guarantee plenty of burnout action when you add GT-40P heads to your 5.0 Mustang. Headers and a camshaft will help but the engine really needs aftermarket 3/8 inch connecting rod bolts and aftermarket cylinder heads. 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. Worst AFR 165 dyno ever | Factory Five Racing Forum If you know him, ask him. Yea. I'll save the effort and lighten my front end by 50# with aluminum. 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). . Test 3: Installed the larger Lunati camagain, no other changes. Its increase while significant is still only about that of a decent 351 w, hi im building a nastalgic car so im not going to drag race it but it must go ok ive got a 302 windsor basicly recoed stock but i want to run tunnel rams to go with the the3am would like to put choppy cam and replace the heads any ideas would be much apprecited thankyou, What is the stock head cc of a 1992 f150 302 windsor. HiPo manifolds and Ill be good. You might even say its like flogging a dead horse without any animals actually being injured during my moments of sarcasm. This is what I recommend to everyone who is doing a budget 5.0 build. LOW-BUCK 302 FORD HEAD UPGRADE Richard Holdener 239K subscribers 189K views 2 years ago WESTECH PERFORMANCE GROUP WHAT'S IT WORTH? I am working on a set of iron GT40s hoping it goes faster. Beyond the engine's amazingly good appearance, Moore had a couple of good reasons for choosing this engine. The entire front accessory drive and timing chain cover must be removed, along with the distributor and intake manifold. 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. 69.90.139.244 Its funny no one mentioned anything about ignition timing or components, Your email address will not be published. This combination should be good for about 400 horsepower and as much as 500 if you opt to use the stronger aftermarket pistons. Good on ya Jeff Smith. 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. Ford Factory 5.0 Performance Cylinder Heads. 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. 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 You'll have to plug the oil hole that is in the engine from the old oil dipstick. Yep my **** is coming apart again Isnt life great! Motor is going into a Ranger. This is a common mistake with first-time cam buyers who dont necessarily appreciate that the cam is just one component of the overall engine package. The Fora platform includes forum software by XenForo. T5z and 3.89 9" TL rear. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. These are Ford iron GT-40P heads. If you can find individual flanged headers like the obsolete MAC headers had, those worked really well with GT40P's. people can stop saying that adding aftermarket cam with stock heads is a waste of time. There was an article in Hot Rod magazine in the mid '80's where Jon Kaase was developing 351w packages. While the heads were off getting a massage, we turned our attention to the cam timing. I've got gt40p heads for it I'll be running, and can't afford better . If you smooth out the bowls and exhaust ports and gasket match the intakes they should flow decent. Vehicle: 1972 2 door 302 maverick, 1986 5.0 stang gt convertible,66 mustang coupe, HEMI ram. GT40P Heads how much hp from them. - StangNet +1 I would go with the regular GT40 heads. - I have a 1989 f150 with a 302 5 spd. 1 - 7 of 7 Posts. many thanks to all you eco-hippies giving me dirty looks and helping me feel llike an overall badass rebel. First, adding headers will improve power on the existing combination. We set the timing to 34 degrees and rejetted the carburetor to get our desired 12.5:1 air/fuel ratio. 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. P-heads have a smaller combustion chamber at 59cc, which will bump the compression ratio up on an otherwise-stock 5.0 engine. Through Central Coast you can have the heads fully prepped for your combination. 302 .030 over with; Scat Forged Steel Rods, SpeedPro pistons and rings . A forum community dedicated to Ford Mustang owners and enthusiasts. I've not seen a set of longtubes that have an issue with GT40P's, either. Application Fits 1979-95 Mustang 302/351 w/ OEM Small Block Ford Heads 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. GT40P heads, what kind of performance do they give? - FourEyedPride.com How to Get More Horsepower Out of a Ford 289 | It Still Runs T5 with 3.73s. GT-40P Heads - 5.0 Mustang & Super Fords Magazine - MotorTrend 302 GT40 Dyno Results - FourEyedPride.com i've got a short block started, and i recently came across a set of GT40P heads for FREE ( love family members). Free shipping for many products! Yes- thank you. Holten runs the factory fan, but he had removed it when he ran the 12.63. Late-model ford GT40 and GT40P heads with 1.84-inch intake valves will also flow 185 cfm at 0.50 . In less than an hour, we were ready to test. FORD GT40p 4 BAR HEADS IN GOOD CONDITION w/ONE BOLT BROKEN FORD GT40p 4 BAR HEADS IN GOOD CONDITION . We didn't increase the valve size, although we did have to add Manley valves to get the proper spring-installed height. You can use the stock roller lifters with any size cam you want. This will keep you from dropping your overall static compression ratio and losing power. These cast piston short-blocks are not quite as good as the forged piston 5.0L that came in Fox-body Mustangs, but the GT40P heads flow much better than earlier 5.0L heads. The hardest part of swapping the cam was just getting the timing cover off and back on again. What would be the best cam and springs to use for these heads in a 302 Windsor? Step 1. AFR 165 Heads | Have options for pedestal mounted rocker arms or stud mounted rocker arms. Required fields are marked *. Budget 300HP 302 Build Once you get into the FoMoCo aftermarket aluminum GT40s though, all bets are off. PTP Engineering front suspension and 25540R17s all around. $930.00 + $55.00 shipping. Come join the discussion about popular models such as the Mustang, Galaxie, Falcon, Fairlane, Torino, Shelby and many more! $139.99. 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. They also have emissions legal heads as well. 950.00 us a set and will ship . Really hurt too. Related Resources Mustang Generation Nicknames: What Do They Mean? 331/347 stroker w/gt40p's, waste?Hp?cost involved? - Maverick document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); This site uses Akismet to reduce spam. Small Block V8 (221, 260, 289, 5.0/302, 5.8/351W) - GT40P heads? If you're running a stock cam, 1.7 rockers will work perfectly. Slover primarily focused on the exhaust side of the GT40P heads. We did a quick search for hydraulic roller cams and landed on a COMP camshaft that looked promising. Different years can have different combustion chamber sizes but ffor the most part there will be no performance increases by going with 302 heads. 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. You'll also have to use your 289 timing chain cover since it has a hole for the oil dip stick and fuel pump. This kind of improvement may not seem like much, but the owner of our test car, Jamie Holten, runs in FFW Trophy Stock where three-tenths is a lifetime. 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. (Please note these are not GT40P Explorer heads). 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. 351W D0OE-C heads better than GT40P\'s? - Ford Muscle Cars Tech Forum What you are trying to do is to increase the amount of airflow through the engine in order to make more power. Because of this, your tuneup will probably need to be modified. Well assume it is a 5.0L with stock heads. Let us explain. SB Ford GT40 Drop In Valve Springs Kit, Hyd Roller w/ Stock Cam, .450" lift and below. The only way to really make more power is to go with a stroker kit, blower and/or heads. Within a few hours of his discovery, the engine was sitting in the back of his truck on its way to a new home. That's fantastic for the minimal investment we made. I'd much rather be able to drive it at 8 or 9/10s of what it can handle. I have to agree, the GT40P heads flow better than the GT40 iron heads. Win or lose, if you buy the ticket you must take the ride. The fix: basic power upgrades for a sluggish 302 Well offer one as an example. this is the price for one head. Posted on May 07, 2014 by promarengine. There are literally a dozen or so camshaft companies that offer a mild hydraulic roller cam for a 5.0L Ford. If I remember right, non of the GT40P's (later models) had the thermactor smog provisions. GT40P heads, 302 and Victor Jr. intake: - Factory Five Racing Forum The GT40P heads flow a lot better than stock 351 heads. The Edelbrock Performer RPM is a good choice, but Holley, Weiand and Ford Motorsport also have similar offerings. Here is the lowdown on exhaust manifolds and VALVE SPRINGS. These are some of the pictures I have showing the Explorer manifolds. Ford Explorer Mountaineer 5.0 Ohv Iron 302 Sbf 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. That said there are some better aftermarket options for heads also. The GTp heads are like GT 40's with smaller combustion chambers and the spark plugs are relocated for a more efficient burn. 1985 Mustang GT Mild 331 4bbl 5 spd, 1985 SEFI LTD LX AOD. (its not their engine) 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 was thinking the same but the enforcers are $647ea now so $1400 (inc tax) is the entry price for good set of heads. The only failures Ive had were timing chains and a couple broken rods in a mid 80s 302 with 200,000 miles on it that got about 35 lbs of boost stuffed into it when a pop off valve I bought on ebay failed. Like I said lots of options. '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 Over $2050 for the 165/185 renegades. They work, but present their own challenges. That's a 40 per cent increase in power from a simple head and cam swap, and one seriously happy Mustang owner! With no other changes we gained 25 hp using factory iron heads. Not sure about that but got some pictures of the cast iron explorer manifolds on a 302. I'll prob take a trip up there this weekend after scavenging the junkyards, thanks a million. Features hardened 4140 Chromoly retainers, valve locks, spring shims, a spring height gauge, valve seals, and instructions. Richard Rowe has been writing professionally since 2007, specializing in automotive topics. Pride is built, in your garage, with your two hands. You can find them on later model Mercury Mountaineers and several other Ford SUV applications. 68stang351 Founding Member May 16, 2002 850 i'd love to use these heads,. Both swaps made more sense when parts were readily available at the bone yard for cheap. Test 2: Changed to the smaller of the two Lunati camshaftsno other changes. 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. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. The "P" heads flow better. The best thing to do would be to use a specific break-in oil for the first 200 to 300 miles of use to reduce the change of a potential problem with undue wear. As you might expect with more duration, the idle quality dropped significantly but was still able to make 11.5 inches of vacuum at 980 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. This is needed for the steel roller cam. I have managed to get 402 horse power from a 289 hipo natural aspirated. I guess someone could just do a basic valve job and throw on the GT40 upper/lower intake for a cheap HP boost. I ran the Speed Pro L2488 pistons and it had me around 9.9 compression with a .041 head gasket, Now I had GT40 heads milled .020 and so that's just a guess on the CC. Note the head bolt hole issue, some GT40 iron heads had 1/2 holes, if not they will need to be enlarged. 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.