What do you mean with "Double up head gaskets" ?
Is it adding 2 head gaskets instead of 1 ?
If yes, i'll answer that it is not enough to lower the compression ratio to what i want.
Adding another head gasket would only lower the CR from 10:1 to 9,7:1 at best.


Actually, as i'm going to run 1bar of additional BOOST, i will have to lower the CR to 8.5:1 or 8:1 at best.