Engine/Transmission (1994 - 1998) Thicker head gasket

[PKirby]

I am in process of assembling my '95 engine. My pistons are . 040 over for a '93 rotary pump engine. I am using a '96 auto P pump and injectors, #5 plate, Duramax intercooler. I know I have an odd combination. The head was milled . 015 to true it up and the pistons protrude . 019. I have ordered a . 010 thicker head gasket, should I use it or go with a stock one?

 

[Joseph Donnelly]

If I recall, stock protrusion is about . 025" with the stock gasket thickness. With some hopped-up engines, people have gone to . 020" thicker head gaskets, dropping compression with the 180/215 hp style bowl from 17. 5 to 16. 4 to 1.