If you bring # 1 cylinder up on TDC on the firing stroke on balancer( you can look at the distributor rotor also up ) and timing cover marks and put air pressure in that cylinder and it stays at TDC so will #6 scope thumbs
Most motors will have between 2 to 6 degrees from TDC that the piston will stay still there with air pressure, after that they will blow down under pressure whiney shruggy

Last edited by Cab_Burge; 05/03/17 05:15 PM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)