Whats your compression ratio?

[Mark Husar]

I am at 10.5 and run either 105 or 112 race gas mixed with 91 pump gas. The cobra snarles like a rabid dog. I luv it!!

[Dwight]

5.0 EFI 10.9:1 with aluminum heads and 93 oct gas. I made about 18 pulls on dyno's in three years. And a thousand 6000 plus rpm shifts, no problems.
Dwight

And about 18 runs down the Main Street of London.

[CoupedUp]

I am running a Keith Craft 427 Windsor. Dart iron block with aluminum heads. 10.5 to 1 compression and does just fine on Kalifornia krappy 91 octane.

Doug, SPC088

[Power Surge]

I'm running 9.5:1 with iron heads. I would have run 10.5:1 if I had built the motor from scratch, but I went with a nice already built motor. It's been flawless thus far.