Just curious why you are only porting the exhaust side?
I would say,you will make more power by porting the intake port over the exhaust.
I would love to install the 4200 into my 69 Camaro,but I am stuck for now w/my 250.I like the nastalga engine that it came with.
I would also like to see that engine installed in the Chevy Colorado or GMC equivilent
MBHD
