Inliners International Forums General Discussion Blown and Injected Hacking together EFI on an Pontiac OHC Six

That is the problem with production tolerances a lot of times.

Our 250 inline 6's are supposed to be 8.5:1. depending on year of course.

But when you have pistons sitting down the deck, chambers being larger than what they are supposed to be etc, we would be lucky to have 8:1

MBHD