So, rumor has it I may be able to put some 4V heads on my 2V block. If that is true. I want to know. What kind of power could I get out of a High Compression 4V. I maybe rebuilding my engine here in not too long, and I want to know if I need reliefs cutt in to the pistons for a stage 2 cam? and if I got a stage 2 port and polish, if I would need to bore the cylinders. Anyone know the answers to these?