i have a gsr with som mods. im trying to rebuild my block with pistons rods and keep my gsr crank. the head will be getting port flow valves, springs, retainers. maybe some cams. what pistons and compression should it go with i have a zex kit

 

Single fogger? Don't build the block, and run a 75 shot.

Direct Port? Build it with 11:1 compression, and try a 150-200 shot. Have fun refilling the bottle though.