One more question reguarding headwork

[2590402]

Im wondering how much is to much when milling a e12 head. Any help would be great. Thanks.

Andrew

[rho]

Re-surfacing a head around here is $50-60.

[AlanM]

I think the author was looking at how much material removal is too much. Given the age of these machines, chances are the head has already been skimmed somewhat. I would only take off what is necessary to clean up the head, and look for higher comp pistons to make up the shortfall. There is a dimension available of std head thickness, but I don't remember it at this point.

It is all a compromise over use,money, fuel used, induction, camshaft and what you expect in the end. 9.5 to 1 should be good with a mild cam, and a 2bbl carb and intake manifold upgrade.

I ran 11.5 to 1, with lumpy pistons, big cam, 45DCOES and Avgas, but I would not recommend this for everyday use

[Guest Anonymous]

Full thickness is 5.080" plus or minus about .002". I think the factory spec is 5.055" as a minimum. Below the min. you can use the extra thick head gasket which is about .012" thicker than standard. Reducing the head thickness raises compression but also changes cam timing. It's not a good idea to cut the head to get compression. Clean the head only to get a good straight surface.