Definitely go with the copper gasket, but no need to reduce compression by
using a thicker material.
I've run 32 psi with copper, without any failure. If you want to get
serious, O-ring the head.
Keep the sticky side down!
Mark Endicott wrote:
> It has been suggested that I consider installing a copper head gasket
> and even a thicker gasket when I put the Judson on my 1275. As I
> understand it I can and should reduce the compression ratio with a
> thicker gasket to help prevent detonation. I have found a url for a
> company that makes gaskets to order out of pure copper. Is there a
> formula I can use to determine how much thicker gasket the gasket should
> be to add the additional chamber volume to change it from a stock 1275H
> (8.8:1?) to about 8:1?. And/or anybody know what the thickness of the
> stock gasket is?
> Gasket Works list gaskets available in the following thickness. Anybody
> used them for A series gaskets?
> 022,.032,.040,.043,.054,.063,.086, .093, and .125 inches.
> 1970 Midget
> Nashville, TN