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40 Deluxe · 04-28-2020, 05:48 PM

As mentioned, be careful about clearance between piton top and head surface. Also, you really won't gain much compression because the combustion chambers are so big. You'll be far better off getting an aftermarket high compression head.
A Model A "high compression" head is not that high! Stock is 4.2 and aftermarket ones are only around 5.9 to 1; some are 7 to 1. Yet, they are a huge improvement.

04-28-2020, 05:48 PM	#3
40 Deluxe Senior Member Join Date: May 2010 Location: now Kuna, Idaho Posts: 3,781	Re: Lower cylinder head As mentioned, be careful about clearance between piton top and head surface. Also, you really won't gain much compression because the combustion chambers are so big. You'll be far better off getting an aftermarket high compression head. A Model A "high compression" head is not that high! Stock is 4.2 and aftermarket ones are only around 5.9 to 1; some are 7 to 1. Yet, they are a huge improvement.