Originally Posted by iambigperm
That gives me a lot of stuff to try out. Is there any down side to running less than spec on valve lash?
Not unless you get real carried away. You can tighten it up quite a bit but only go .004" looser at the most than cam card spec.
Try .020"-.022" set cold.
RPM issue: Possible weak spark. Make sure the engine is grounded to the car body. Other wise your shifter cable is the ground. -not good for the spark or the cable life.
Good lookin' Regal