These lower intakes tend to get interchanged a lot. The flow is low where you need it. Alright im thinking about buying some gt 40p heads and plan to run them with my mods below plus 24lb injectors. Intake lift Flow CFM Exhaust lift Flow CFM 0.100" 64.2 0.100" 52.3 0.200" 114.3 0.200" 97.7 0.300" 166.5 0.300" 128.0 0.400" 199.4 0.400" 136.5 0.500" 212.5 0.500" 134.1 0.600" 217.4 M-6049-X303/X305 Intake lift Flow CFM Exhaust lift Flow … He only gives a part number M-6049-p303. I can't remember the exact numbers of the GT40 and 351W heads so I don't know if they flow better. Would there be a gain in head flow if you put 1.94 1.60 in the P's? 289 heads have smaller chambers (54cc I believe) which will add some compression but not enough to make up for the difference in flow. Head Flow Numbers. GT40 F3ZE cobra headsTrick Flow stage 1Stock bottom end - rebuiltProform roller rockers 1.6 ratioFlowmaster Super 44's 2.5 dual exhaust front to back Remember those flow numbers are on a flow bench to try to simulate ideal conditions at Wide Open Throttle. They flow better than the later year heads (except for the Lightning’s which had GT40 iron heads), but the engines was choked with a very low profile intake and pretty terrible exhaust manifolds. 65.7 52.9 Twisted Wedge 76.65 57.3 "Power heads" 67.05 57.9 the 40s are better than the E7 heads, but the P head sort of toasts them both. 14 TFS -51500003 Trick Flow - R 345 CVM 370 CFM 395 (+) CFM ... 3 FOR Ford GT-40 EFI 220 CFM 250 CFM 280 CFM 310 CFM (Welded) 4 EDL Edlebrock Perfomer EFI … Darrell said: GT40s definitely flow more. Af your interested in same dyna numbers with a parted GT-40 style (fañf and when you upgrade heads), see my Sig. Ported correctly they will flow ~215-220cfm GT40/GT40P flow ~190cfm Ported correctly GT40s flow ~230cfm Trick Flows flow ~250cfm power gain depends on how well the engine parts take advantage of the added flow potential. He also identifies the GT-40p head as being an explorer head. Cylinder Head Porting. Ford GT40 Cylinder Heads. That's great if you're drag racing and you want to squeeze every ounce of HP out of your SBF. Designed for bolt-down rocker arms part number M-6564-B351 for a 1.6 ratio or use part number M-6564-A50 for a 1.7 ratio.Application. I like trick flow and afr, the gt40, gt40p, and gt40x are good however they are more of a budgeted head. The pinch is now the smallest point in the port, would just like to open it a bit more at the 2.5" point if the measurement is correct. Perhaps cheaper used. The gt 40's ported and polished made 270 hp at the rear wheels, the E7te's made 254hp fully ported and polished. Gives me a little hope for my 85 GT with the 331 and GT40 heads. If you are broke as a joke then scape together $275 and pick up a set of GT40 irons. I have some gt40p heads that I was going to enlarge the head bolt holes so they would fit a 351w. The Ford 289/302 heads were available with many different valve sizes. Like other stock castings, there is plenty of room for improvement with this head. #1---Head Flow Charts & Comparisons : 12/23/2021: There are enough flow numbers on our website to keep everyone busy for a while.
The CNC version improved the peak airflow by … I know ported 40s and DOOE heads flow the same. Darrell said: GT40s definitely flow more. Valve Sizes: 1.85" intake 1.46" 50 State Smog Legal: No Notes: * For new assembled heads. 5.0 Flow. Larger pushrods will not fit without clearancing and is not recommended since some areas are very thin. The GT-40 (P) cylinder head is popular for classes that must run a stock Ford production head. The Windsor engines just couldn't be built at the time to compete effectively with the strongest GM and Mopar small blocks offerings, and the Cleveland engine was the answer to that problem. It has 2.02/1.60-inch valves for improved flow along with 64-cc chambers.
Yeah - what they said. ... 13 TFS Trick Flow Track Heat 225 CFM 250 CFM 310 CFM 330 CFM . It came back today along with the following airflow chart (numbers in CFM, before and after 'extrude hone abrasive flow machining'): Runner 1: 204, 277 Runner 2: 215, 299 Runner 3: 216, 304 Runner 4: 212, 293 Runner 5: 201, 281 Runner 6: 221, 304 Runner 7: 218, 299 Edelbrock E-Street Aluminum Cylinder Heads offer American-made quality and affordable performance. Like other stock castings, there is plenty of room for improvement with this head. Stock air flow on this head tops out at 190 cfm intake and 128 cfm exhaust. When “ Undercover Ported “, the GT-40 head will flow 202 to 210 cfm intake and 145 on the exhaust side. I can't wait to get to a dyno to see the torque and HP curve. We now have a SAENZ model 680 flow bench which we all enjoy using. Small Block Ford Cylinder Head Porting e-mail us: shadydell2005@aol.com or call (814) 237-4990 Ported Stock Lower Intake. best et 11.13 and no head problems yet to date. The P head exhaust port has a lot of sharp edges and can really benefit from just a little grinding. I'd look for a set of used aftermarket heads. Stock air flow on this head tops out at 190 cfm intake and 128 cfm exhaust.
I ask because aren't the valves, in the gt-40 already around 1.90 and 1.60 already? to 7/16 in., Ford, Small Block, Set of 20 Part Number: TFS-51400419 We open up the Intake Port enough to still use the same Intake Manifold and gain overall performance without making the Casting thin. Most flow numbers for SD Performance heads come from their Web Site updated May '15. In the road-going GT40 Mk III, the 4.7 V8 was detuned to 335 horsepower. It has all the bells and whistles and even gives us information that we didn't even ask for. We aren't in the 60s anymore.
Sure there are better aftermarket heads that flow better. My 351w is a 1974 with stock heads and pistons. I could get higher peak numbers if I wanted to work more on the intake runners but that wasn't where I wanted to improve when I started the work.
May have to use the stock worked on 4180C til I can afford to get a Holley 650. Improved Air Flow. The GT40 heads have thermactor holes built in to connect to the EGR/smog equipment whereas the GT40P heads use an external EGR connective system.
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