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I see the 68 430 was 10.5 compression, do these cars adequately cool on 93 octane? I've had to enlarge combustion chambers on a Pontiac to stop spark knock and overheating, but that was on an earlier car with a vertical flow radiator.  Thanks

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My 68 430 runs between the 1/4 and half way marks on my temperature gauge no matter what octane gas I use, never getting any higher than the half way mark. I ran both 89 and 93 non-ethonal gas in my car this weekend in 90 degree heat and it never ran hot.

Edited by NC68Riviera (see edit history)
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. . . same here - never had an overheating problem, even on 120 octane avgas !

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