Valvetrain Geometry

Earlie A said

And the old Crane and Mopar Performance stuff was never bushed, correct? So just aluminum right on the shaft. Did higher spring loads lead to wear?

I have a MP solid aluminum rocker for a W2 head. I would think that a high spring load would be anticipated on a W2 head yet Crane and MP still made them unbushed. And all I ever see is raving reviews on the old Crane stuff.

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I used Crane rockers for years. The only reason I stopped using them was because I went to a 1.6 rocker and Norris was still making their steel rockers.

Or I would have bought Crane 1.6’s.

The seasons are all running together now but I was at least 320 on the seat with those and never had measurable wear after the initial wear was done.

I’m not sure but I believe I was told that anodizing is not straight or round. If that’s the case, then the initial wear was because the unit loading was so high until the high spots leveled off so to speak.

The other thing is I never run a plain or bushed rocker and a roller cam without full time oil to the shafts.

The way I do it, what ever the pressure is on the gauge is what’s at the shafts.

Low idle oil pressure will get a bushed rocker grabbing the shaft pretty quickly. So I always use full time oil it to any rocker with a roller cam.

I’m doing it on my junk this time because for no other reason than I want to stop pulling oil from the crank to feed the rockers.