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John · 01-28-2024, 11:38 AM

The marketed "high compression " heads have a different shape combustion chamber. Due to the shape of the original Model A head, shaving the head will have little effect on the combustion ratio.

01-28-2024, 11:38 AM	#2
John Senior Member Join Date: May 2010 Location: Richmond, VA Posts: 189	Re: High Compression Head The marketed "high compression " heads have a different shape combustion chamber. Due to the shape of the original Model A head, shaving the head will have little effect on the combustion ratio.