Thread: N/A GT40X Combos Inside

271/303 before and 276/315 after just curious- were both runs the same day?

Quote: Originally Posted by slow87GT 5rwhp 12ftlbs but he changed the upper intake too. Bear in mind that all the data shows that, stock to stock, the Cobra, GT40 and Explorer all are within a horsepower or two of each other. The port job not only added a few peak hp and a lot of torque, but it moved the power up across the board. It is a very noticable difference in driveability.

Quote: Originally Posted by slow87GT just curious, you had the tubular upper before and after? I think he stated that the first run was with a stock cobra intake.

Ok but still, what are the starting numbers and what are the ending numbers. I want to know what you are getting out of the combo

Quote: Originally Posted by slow87GT 271/303 before and 276/315 after just curious- were both runs the same day? isn't a better question - were both run SAE?

Great info guys keep it comin!

Would the X-307 with 58cc chambers/178cc intake ports be to much for a stock cammed 302 with mild bolt-ons? (loss of low end torque not being a major concern). I was also looking at the Y303, but has the large 64cc chambers with smaller 160cc intake ports. I was curious if the 64cc chamber would hurt compression that much. The application is a road-race car with average revs in the 2500-5500 range. The X-307's are available from Jegs for...

i have a buddy with almost the same combo as yours. they are gt40y heads though, 1.6s, f cam, mac shorties, gt40 intake, 65mm TB, tremec, 3.73s, a coupe with no a/c, no p/s and no smog. probably weighs 3100 w/ driver. 1/8 mile in 7.60s@88. made 290rwhp. __________________ The Internet: Where men are men, women are men, and teenagers and children are FBI agents.

3500+lbs. 95 GT with stock shortblock, 64cc GT40X heads, E303, and an Edelbrock Performer + bolt-on's went 13.10@105mph with bad 60fts. Would have gone probably 12.7-12.8 at that weight with tires or probably mid-low 12's in a lighter car on a tire. Not the best heads out there, but they are decent. __________________ 95 Laser Red GT Coupe 11.71@121mph

i had an 11-1 comp. 306 with GT40X heads TFS1 cam, Ford Racing 1.6's, tubular GT40 intake, 1in. spacer, bbk 65mm TB, 75mm Pro-M mass air, 24lb. inj, pullies, no smog, still had power steering and A/C, aluminum radiator w/electric fan, Crane Hi6 ign. box, Msd Coil, Cap & Wires, Ford Motorsports Shorties, off road H pipe with flows, T5 w/stg 2 Centerforce clutch, Hurst shifter, 3.55 gears, car went mid 12's on bald radials and...