This will cost additional money but is still worth it, in our opinion. 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. Here is the lowdown on exhaust manifolds and VALVE SPRINGS. GT40P heads? how hard to put on? how much HP and torque? Holten runs the factory fan, but he had removed it when he ran the 12.63. Test 2: Changed to the smaller of the two Lunati camshaftsno other changes. Thank You. 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. Actually, making around 240 to 250 hp with a near-stock Windsor 302 will feel pretty good. MAC is the only manufacturer of these headers, and the parts we installed fit like a glove with no problems whatsoever. They almost seem like flywheel numbers rather than RWHP numbers. That carbureted GT40P motor made 465 on th engine dyno with a .500" 239/244 camshaft, Holley 650 carb and Weiand Stealth intake. Trick Flow Mustang Valve Spring Upgrade Kit - Cast Iron Head (79-95) The fix: basic power upgrades for a sluggish 302 Those are really good numbers. Boy, were we surprised with the results. by travis Sun May 03, 2020 8:33 am. Maybe I'll think about a cam swap? It's a classic move we've pulled off many times. Per a UEM tech support email I have the Icon IC736 is supposed to be good for GT40 heads when I asked about it. Beyond the engine's amazingly good appearance, Moore had a couple of good reasons for choosing this engine. I have a very good running stock 1981 302 in a F100 short box. Car Craft mag. LOW-BUCK 302 FORD HEAD UPGRADE Richard Holdener 239K subscribers 189K views 2 years ago WESTECH PERFORMANCE GROUP WHAT'S IT WORTH? The rest went very smoothly, and we reused the stock lifters and suffered no ulcers worrying about breaking in the cam. I'm also have the regular GT40 heads on my current build. After graduating from Iowa State University with a journalism degree in 1978, he combined his two passions: cars and writing. While the heads were off getting a massage, we turned our attention to the cam timing. I got lucky and found a complete Explorer GT40P engine online. Then why did you port the heads and how do you know if you made an improvement. This engine will be good for your 65 Mustang. Have fun, be safe, enjoy. We know what you're thinking--only two-tenths from an extra 45 hp? Manual trans. This combination should be good for about 400 horsepower and as much as 500 if you opt to use the stronger aftermarket pistons. Understanding Ford's Fox Body GT40 Cylinder Heads - CJ Pony Parts Long tube headers are a terrific idea, but you need to open up the exhaust side. They also have emissions legal heads as well. The Fora platform includes forum software by XenForo. I'd much rather be able to drive it at 8 or 9/10s of what it can handle. Last Edit: January 18, 2015, 12:05:31 pm by businesstrader Logged shaunp. Compare. Consider having the head's intake ports matched to the intake manifold gasket. . No-option stripper- I like strippers. 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 had those on my car before I upgraded and they were nice heads. You can have your current 28 oz rebalanced to 50. LOW-BUCK 302 FORD HEAD UPGRADE - YouTube I was looking at putting on the GT40P heads on. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. The factory heads have a boss for the exhaust valve that restricts flow through the exhaust port. K.S. Tim's junkyard refugee survived the beating and we had a bitchin' story. Install a set of GT-40P cylinder heads from a late 1990's Ford Explorer or a set of GT40 heads from an early 1990's Mustang 5.0L. Gt40/gt40p Heads On A 351w Questions - StangNet Get 500 Horsepower from a Junkyard Ford Explorer 302 - MotorTrend (its not their engine) After we installed the heads and with the fan off, he ran a 12.46 at 107.9. I had a set of 69 302 heads I ran for a while . Choosing pistons to complement GT40P heads - MustangWorks.com And have discovered something that I dont think anyone else knows. Ford 302W / 5.0L History & Specifications - The Ranger Station Headers and a camshaft will help but the engine really needs aftermarket 3/8 inch connecting rod bolts and aftermarket cylinder heads. The entire front accessory drive and timing chain cover must be removed, along with the distributor and intake manifold. You can email the site owner to let them know you were blocked. Install a Ford Motorsport E303, X303 or F303 cam, or any of the similar units from Indy, Lunati or your favorite manufacturer. If you wanted to make your engine feel strong, these would be a decent investment, but they will require some modifications. 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. 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. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Even with a stock Mustang 5.0 cam makes good power. 68 XR7 & 68 M-100. Its always refreshing to see a FORD getting a little face time in your column, even if its a tired 302 with no great expectations of setting the world on fire when the dust settles. Joined . What would be the best cam and springs to use for these heads in a 302 Windsor? This test went so well that we were eager to see what the slightly bigger cam would do. Assuming this will be a daily driver engine, a short duration camshaft, especially when combined with a four-barrel dual plane intake manifold and headers, will deliver extremely snappy throttle response and the whole combination will increase the torque and peak horsepower by somewhere in the neighborhood of 20 to perhaps 35 horsepower. Where they differ is the combustion chamber size. 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. You can have your current 28 oz rebalanced to 50. 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. For a better experience, please enable JavaScript in your browser before proceeding. This will follow the guideline of a 1.6 rocker baseline and factory bottom end 79-95 related 5.0L Mustangs only. We took the heads to Mike Slover of Slover's Porting Service in Sun Valley, California, to do this work, plus some basic pocket-porting to improve flowespecially on the exhaust side. Install a set of 1.7:1 roller-tipped rocker arms on the heads. The heads also required some machine work, including screw-in studs, guideplates, and widening the spring pockets for bigger valvesprings. I have a 302 Windsor V8 EFI engine that I converted to a 600 cfm carburetor with a Street Warrior intake manifold. A forum community dedicated to vintage Ford Mustang owners and enthusiasts. It turned out we were conservative on both counts. 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. Every thing he tells you on this site is true. You keep stock drivability, and stock gas milage if you can stay out of boost. 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. 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. Even with relatively small valve sizes of 1.85-inch intake and 1.46-inch exhaust, the P-heads flow much better than previous. Keep in mind that swapping camshafts is a fairly extensive effort. This is not a criticism but instead consider it to be more of a heads-up. Ford GT40P 302 5.0L 4 Bar Cylinder Head Assembly Pair w/ 1/2" Head Bolt Hole. Calculated compression to 9.8:1. Eldelbrocks Air Gap intake manifold should work well with the combination. this is the price for one head. The GT40P cylinder heads had a small combustion chamber ranging from 58-61cc while the GT40 heads had a 63-66cc combustion chamber. I used Lightning heads on my 302, (GT40 not P) with stock rockers on a flat tappet engine. THANKS VERY MUCH! But don't think that adding a bigger camshaft will make more power. With the P-heads requiring pedestal-mount rockers, we also called up Crane Cams for a set of 1.6 pedestal-mount roller rockers. Test 1: 750-cfm carburetor, dual-plane intake manifold, and stock camshaft. There are a couple of reasons for this suggestion. 99 Explorer engine (302) with GT40P heads - Ford Muscle Cars Tech Forum In less than an hour, we were ready to test. (Please note these are not GT40P Explorer heads). If you can find individual flanged headers like the obsolete MAC headers had, those worked really well with GT40P's. Most of the time, GT-40 heads are worth a good 20-40hp over stock heads. We guarantee plenty of burnout action when you add GT-40P heads to your 5.0 Mustang. This time around, we chose a shining example of this junkyard art form. 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. A forum community dedicated to Ford performance owners and enthusiasts. Can anyone give me a little feedback about a '99 Explorer 5.0, and tell me if it's my answer. T5z and 3.89 9" TL rear. 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. Yep my **** is coming apart again Isnt life great! We were cruising the 'yard a while back and located a 2000 Ford Explorer with an EFI 5.0L V-8 engine. Features hardened 4140 Chromoly retainers, valve locks, spring shims, a spring height gauge, valve seals, and instructions. Obviously, tuneups will vary. The engine was only rated at 215 hp, but it at least had 9.0:1 compression. I added a link to it. These are among the best of the iron Ford Windsor heads as they tend to flow much better than earlier castings. $700.98. 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. 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. Plus you will need to drill all the head bolt holes out as the 351W uses larger head bolts. P-heads have a smaller combustion chamber at 59cc, which will bump the compression ratio up on an otherwise-stock 5.0 engine. The headers will improve this airflow throughout the entire rpm rangeadding more torque and horsepower. But the part about a cam replacement possibly being a labor intensive undertaking is correct. For a better experience, please enable JavaScript in your browser before proceeding. GT40, GT40P, would be great factory heads. If you smooth out the bowls and exhaust ports and gasket match the intakes they should flow decent. 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. fuel injection system . So . A mild porting with gasket matching will be very good. I'll prob take a trip up there this weekend after scavenging the junkyards, thanks a million. gt40p heads on a 289 in a 66 | Vintage Mustang Forums There are several actions that could trigger this block including submitting a certain word or phrase, a SQL command or malformed data. 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. They fill that spot between power and budget. He has worked as a tractor-trailer driver and mechanic, a rigger at a fire engine factory and as a race-car driver and builder. 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. Ha! P-heads have a smaller combustion chamber at 59cc, which will bump the compression ratio up on an otherwise-stock 5.0 engine. I'm wondering how these heads will interact with the paxton 1220 sl supercharger I'm trying to put on. He'd be the best source. Just make sure it is a roller cam. 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 newer camshaft is designed for use with a soft bronze distributor gear, not the hardened steel gear used for older camshafts. 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. Click to reveal Shop by category. OR you could put your automotive journalistic skills in motion by reporting on the many new modern components available for the latest generation 351 Cleveland. So I've got the motor and heads already for my maverick project. 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. 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. ***Most important is theStupid question is the one that was never asked!*** Compare. What you are trying to do is to increase the amount of airflow through the engine in order to make more power. 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. Assemble the rotating assembly with a stock 5.0L crankshaft, a set of 5.0L rods and the specified pistons with stock-type rings. Ask Away! with Jeff Smith: Camshaft and Cylinder Head Recommendations 302HO with gt40p heads | Mustang Forums at StangNet T5 with 3.73s. The GT40 & GT40P heads had a few differences that are note-worthy, the most importantly being the bump in compression. Buy the lifters for peace of mind now and hopefully for the duration. Along with the heads, we used MAC headers for GT-40P heads. Also, you'll need to get a steel distributor gear to replace the iron gear that is currently on your distributor. 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. I need that part number too! Building a 302-inch small-block to produce 400 hp is really no big deal, but doing. Let us explain. JavaScript is disabled. JavaScript is disabled. how much HP and torque? It runs smooth but seems lazy. Dec 8, 2011. GT-40 heads HP increase | Mustang Forums at StangNet 69.90.139.244 I must agree with Jeff Smith. 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. The GTp heads are like GT 40's with smaller combustion chambers and the spark plugs are relocated for a more efficient burn. Torque on the other hand isnt something to write home about. I have to agree, the GT40P heads flow better than the GT40 iron heads. Took me 7 hours to do one head.but they cleaned up real nice. #2::: Get advice from a reptile engine builder with experience(first flag for me is when somebody refers to an ENGINE as a MOTOR! Just put some 1.7 pedistal rocker arm on along with a mild camshaft (make sure to use the correct valve springs), you will make over 300 flywheel hp. JavaScript is disabled. He'll have to get a gear for his distributor. 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. I got a set of AFR heads , night and day. The Fora platform includes forum software by XenForo. 950.00 us a set and will ship . 1.7 shaft rockers and beehives. That's a 40 per cent increase in power from a simple head and cam swap, and one seriously happy Mustang owner! An aggressive cam will wake it up a bit. Come join the discussion about popular models such as the Mustang, Galaxie, Falcon, Fairlane, Torino, Shelby and many more! Don't let the fact that the iron GT40 heads have a larger exhaust valve fool you. Compare. Like I said lots of options. We did the installation at Holten's place of employment, Motorworks, in Longwood, Florida. These engines came with the GT40P head, which even with its small valves, offers really good performance. They work, but present their own challenges. Someone does make the Tri-Y's headers for the early Mustangs using the "P" heads. GT-40P Heads - 5.0 Mustang & Super Fords Magazine - MotorTrend SB Ford GT40P Drop In Valve Springs Kit, Hyd Roller w/ Stock Cam, .450" lift and below. 1979 Indy 500 Pace Car. Install a set of GT-40P cylinder heads from a late 1990's Ford Explorer or a set of GT40 heads from an early 1990's Mustang 5.0L.