mopar performance push rods

Depending on the size of the base circle of the cam, the height of the block deck or thickness of the heads you may not get enough preload on the lifters with a 7.625 push rod.

I found that in my 360 build with magnum heads I was only getting 0.020" of preload into the lifter resulting in a lot of lifter clatter until the engine had fully warmed up. I went with the 7.650 long push rod and got rid of the noise when the engine was closed.

You can check the preload by screwing down the rocker perches until the slop is just gone (need to do this with the lifter on the base circle) then count the part of a revolution before the perchs bottoms out. The 5/16-18 bolts that hold the perches represent 0.055" per revolution. The 0.020" I had should have been enough but I went with the next longer stock size push rod (7.650) which gave me 0.045" of preload. Of course this is all moot if you are using adjustable rockers.