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I don't think they are going 4.250" with the aluminum block. There was talk of a coating on the cylinder wall that would allow larger bores with the aluminum. I talked with an engine builder who has done a lot of mountain motors with the coating. He said does not get along with nitrous.

Better check on that 4.600" bore spacing. I am fairly sure that is not correct. I beleive it is 4.440" bore spacing, same as stock.

Leon

hey leon I think we are both wrong... I think 4.460 on the bore spacing I had a brain fart ..but this block looks like iron so 4.250.would be right..

Last edited by whitedart; 01/21/13 09:20 PM.