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columbiA · 04-28-2012, 12:18 AM

Model B head is 4.6 c/r,A head is 4.2 c/r,so there is a slight improvement.If engine is in good condition,install a 5.5 or 6.0 c/r head and you will notice a real increase in power.

04-28-2012, 12:18 AM	#15
columbiA Senior Member Join Date: Nov 2011 Location: B.C. Canada Posts: 1,746	Re: 1930 Model AA Cant Get Her Over 25 MPH Model B head is 4.6 c/r,A head is 4.2 c/r,so there is a slight improvement.If engine is in good condition,install a 5.5 or 6.0 c/r head and you will notice a real increase in power.