I am just going by what others are telling me and what engine builders like MRL and IMM have told me. You do not need to listen to me, my car is also in Ca at Sea Level. I had Kb107 at 0 deck which was actually 10.9 with 62-63cc magnum heads and a xe274.[/QUOTE
My 360 has 10.6:1 static compression and cranks 195-205 psi and runs fine on 89 octane. I have tried 87 but I need to be careful. even on 100+ degree days it runs fine on 89.
The key to this high compression on iron heads is a tight quench. The magnum heads I am using ate closed chamber and the pistons are at zero deck, with the .039 thick head gasket I have an
Ideal quench that makes the engine very detonation resistant.
Note: good cylinder turbulence requires less timing. I run 33 with it all in at 2500 rpm. Initial timing is 17.
My 360 has 10.6:1 static compression and cranks 195-205 psi and runs fine on 89 octane. I have tried 87 but I need to be careful. even on 100+ degree days it runs fine on 89. - Location: Pembroke, MA