IMM Engines 408 build

Now that you have run the eng, go back and re torque your header bolts........if the sound goes away or changes, it's a header leak.

I know what you're saying and I really appreciate you're help!
I will be changing cam soon anyways.

I took the drivers side valve cover off the other day (didn't mention this earlier.. I guess I should have) and checked most of not all of the rockers while the cam was on the base of the lobe. The engine had been shut off for at least three hours.
One of the rockers would move up and down much more than the others... I guess this is the bad lifter. The push rod would move with the rocker. Like the lifter wasn't pumping up. If all the rockers I checked was hard to move then I could say everything was OK but this one rocker moved up and down.

a) I've got to take the intake off to replace the lifters
b) Might as well change the cam out since I've got to remove the intake anyways.