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I hear what you guys are saying and you are correct. The reason I like to err on the safe side is I live in CA, a state that probably has the tighest emmissions standars in the country. I woke up one day and premium dropped from 93 to 91 octane. What happens if we wake up on day and they change it again from 91 to 90 or 89? That 9.6:1 motor is going to rattle.



Then you retard the cam or change it altogether. It's much easier than a piston change.

These calculators are a nice pre-planning tool as long as you input your correct/actual values... http://www.wallaceracing.com/dynamic-cr.php Changing the intake closing point changes the results.

I'd shoot for 160-165 cranking pressure and perhaps 7.5 Dynamic with tight quench and iron heads.