New solid roller lifters going in. New on the left, "old" ones on the right.
View attachment 1749919
When I went to order new ones, the tech support at Crower said not to use the ones on the right because I don't spin enough rpm or have enough lift from the cam to make them work properly. I was surprised, since I had used them for over 4 seasons. I only spin the engine to 8,400 rpm max, most times 8K rpm and the lift from the cam is just over .720 at the valve.
The other thing that surprised me about this, is that the ones I wanted to buy were over $1,100 for the set and the ones they recommend are just under $700 for the set. How often does a sales person talk you out of spending more money???
The Enduromax lifters have a bushed roller, while the "regular" ones have needle bearing in the roller.
I guess the reasoning is that the bushed roller needed more pressure on it to get it to roll across the camshaft lobe properly. Without enough load they said it is prone to sliding across the lobe and could wear the roller. IDK, I seemed to have gotten away with using them. The camshaft still looks like new so there was no sliding of the roller follower.Coming along nicely. Interesting how you used the Enduramax lifters for 4 years and you didn't have any issues due to spinning less RPMs than needed for them to work properly. It will be interesting to see how your motor likes the new Crower lifters.