I bought and used a Fluid Dampener on my 528, 4.375 stroke. I bought and used a ATI on my 512 (4.250 stroke) street motor and again when I switch cranks to increase the compression on the 4.3 stroke crank. I have now decided to only use ATI on all of my motors, steel or steel and aluminum ATI all the way

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)