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New hemis are 10.5 compression 205 thermostats and run fine on 87 octane with very short duration cams and brittle pistons.
That probably has more to do with having aluminum heads and advanced ignition/timing controls than anything else. I would pay money to see that kind of a setup not detonate on a carbed motor.
Quote:
I would shoot for 10 to 1 with magnums and that is conservative.
10:1 on an iron headed motor with a short duration grunt cam is NOT conservative.
Last edited by MarkMullins; 10/30/08 10:02 AM.
