One restriction you run into is a lot of the older chassis that orginally came with a inline have a recess in the firewall. The 4200 is wider than the early iron and if you increase the valve cover height good chance you will run out of recess height in the firewall.

Last edited by efi-diy; 02/04/11 04:00 PM.
51 GMC 4.2 turbo
Can't solved today's problems using the same technology/thinking that created them