A couple years ago I worked with Cometic to make a head gasket suitable for up to 93mm bore for my B30.
Finished the engine early this year and ended up with a 92mm bore and 6mm stroked motor which yielded approx 3.5l.
Cometic Part numbers are:
0.043" Thickness - PN H3270SP1043F
0.059" THickness - PN H3270SP1059F
Used an off the shelf Wiseco forged piston and Nascar Carrillo rods. Had to have crank welded, narrowed rod journals and reground to smaller diameter journal to accomplish but was happy with results.
https://www.youtube.com/watch?v=cV-Q1NaQOZk
Neil
Finished the engine early this year and ended up with a 92mm bore and 6mm stroked motor which yielded approx 3.5l.
Cometic Part numbers are:
0.043" Thickness - PN H3270SP1043F
0.059" THickness - PN H3270SP1059F
Used an off the shelf Wiseco forged piston and Nascar Carrillo rods. Had to have crank welded, narrowed rod journals and reground to smaller diameter journal to accomplish but was happy with results.
https://www.youtube.com/watch?v=cV-Q1NaQOZk
Neil