I have a 60 over 427, in my 85 iroc. it is a 11.5 compression with a comp 294s 595 solild cam. The problem is i will hold the motor at 4000rpm with my hand on the throttlei will feel a thunk that feels like its coming from under the intake, Its not consistent. So iam hoping that the cam didnt kill a lobe. I need some help before i just sell the car lol
thank you mike