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Thomas, just to reiterate

April 18 2017 at 11:56 PM

Ross  (Login Bad427stang)
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Response to cam

The black Mustang in my signature is 10.7:1 and runs on ANY fuel I put in it. My 445 F100 is 10:1 and runs on pump gas. You don't need to go to 9.5:1, you are giving up power and torque, and more so if you go bigger cam (mine is in the 240s @.050 in the 489 and 236 @ .050 in the truck).

Being pump gas friendly relies on many more things other than static compression: Cam design, ignition curve, quench, chamber shape, engine temp, mixture.

Build it the way you want, but lots of us running in the mid to upper 10s static compression with mid grade right out of the pump, and FWIW, mine has been happy since 2007 and is nothing but street
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- 70 Fastback Mustang, 489 cid FE, Victor, SEFI, TKO-600 5 speed, 4.11 9 inch.
- 71 F100 shortbed 4x4, 445 cid FE, headers, RPM intake, 1000 HP series Holley, 4 speed

 
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