Quote:
Originally Posted by FrankieT/A
Ram Air 4 cam Factory Ram Air 4 lifters (Try and find those today)
|
If you have never taken the RA-IV Lifters apart, if you do, you will notice that the pushrod cup that is
retained inside the lifter is actually different from a normal lifter in height (if you sit them side by side on the bench).
(the bottom of the RA-IV lifter Pushrod Cup is thicker vs a normal lifter). The part is taller.
This makes them a "Limited Travel" lifter which helps with them not "pumping up" at high rpm and hanging a valve open.
Many times the special Pushrod cups can be swapped to several lifters sets over time if you were trying different
camshafts at the race track.
RA-IV grinds but with different advance/retard profiles.
I wish Johnson or someone would build some of those pushrod cups again.
Then you could use the cups in other lifter sets from Johnson.
Tom V.