I had two occasions that I saw 8400 RPM on my VDO Extreme Playback tach in my old Duster, 518 C.I. pump gas motor Once when I accidently opened the sixpak in the water doing a high gear burnout , the other time was when I broke a trans yoke in 2nd gear at WOT It had all the good stuff, solid roller cam with really good valve springs and all the other good racing valve train parts
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Once when I accidently opened the sixpak in the water doing a high gear burnout 
, the other time was when I broke a trans yoke in 2nd gear at WOT 
It had all the good stuff, solid roller cam with really good valve springs and all the other good racing valve train parts 
