340 stroker 422

fishmens67 said
It will make more of of difference than you think, if done right. The chamber has a lot to do with detonation.
Did use use the 0.039 x 4.180" head gasket in your calculation or the 0.039 x 4.04".

You have to be careful opening the chamber up bigger than the bore.

You can create more issues doing that.