The flow # I mentioned are at .450" lift. Dick did a bit more work on his head and got another 15 cfm out of the exhaust. If I had a flow bench I'd take a head and push it to see where the limit is before crap happen e.g. hit water.

Last edited by efi-diy; 06/13/10 02:26 PM. Reason: fixed error was intake now exhaust
51 GMC 4.2 turbo
Can't solved today's problems using the same technology/thinking that created them