Re: Detonation on a BBC
We have an L78 4 speed Chevelle with 4:10 gears. It is living on 92-93 octane gas. You don't want a quick advance curve in the distributor and you have to back off on the timing a little. Cast iron rectangular port open chamber heads will drop the compression about a point. A longer duration cam will bleed off some cylinder pressure as well. A true 11-1 compression L72 is going to have real problems on 92 octane gas.
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Chevelleless after 46 years......but we did find a low mileage, six speed, silver 2005 Corvette. It will just have to do for now. 
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