so i have a question heres what im about to do i have a dohc zc block with the pm7 pistons in it and im going to put a d16y7 head with delta 272 cam and arp head stubs stock z6 head gasket witch will bring it to 12.6 compression my question is can i run pump gas and do i need it tuned

 

after you do the extensive machine work required to mate a sohc head to a dohc block, you will definitely want to get it tuned.