Re: Detonation on a BBC
A stock L-72 needs High Octane, for the engine to survive detonation and pre-ignition. Water injection alone will not be sufficient.
I am not aware of any bolt on GM performance heads that will reduce the Compression of a stock L-72 to 8 to 1. You can however fit after market aluminum heads which will both reduce compression via larger open chambers and dissipate heat much better.
The aluminum heads will thus, allow you to run a higher compression. Premium fuel, octane boost and proper cam and ignition timing will allow you to run your BBC on the street.
The heads can be painted to provide a stock appearance.(Cost approx. $2,000.00)
Better yet, buy a GM crate 454 HO with 425 HP @ approx. $4,700.00, it runs on premium pump, you can drive it cross country and park the L-72 on an engine stand.
Just my jaded opinion.
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