Higher compression octane requierments

ir3333 said

i agree.
Ballpark with a stock style cam would be comp ratio = octane
i.e. 8.7 = 87, 9.1 = 91 etc

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Ok, but do you mean static comp, or dynamic. At 11.5 to one static, my minimum is now 110+ octane, or are we now in a different ballpark, lol? And what is a stock style cam?, .550+ not at factory...

RustyRatRod said

No,because there are so many variables, there's no such animal. I can give a good example. @EL5DEMON340 get in here. Tell um about your combo. I'll let him give the details, but it's an iron headed small block, over 11:1 pump gas motor. That's but one of many examples.

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Thx, sounds similar, but this is a BB383. Motor is 383, 11.5 to one old school TRW pop-up slugs, iron 915's and a small Hughes mechanical cam. Thx everyone for responses, always good to learn, especially on plan for next build as well.