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Alum heads

Which head Jim?

I found this at Scoggin-Dickey :
The Vortec - High Performance Assembled Heads have a chamber size of 64cc, while the "Fast Burn" Aluminum Heads have a chamber size of 62cc, and the Splayed Valve Cylinder Head have a chamber size of 45cc.

So you see that you should be a little more specific with your question.
I thought the stock aluminum L98 heads are actually only 58cc. The factory head gasket is extra thick. That drops the compression less than what you would expect for such a small chamber.

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