Quote:
There is no odd sign of wear for the pushrods although I have not found a good way to measure them accurately yet.
I had to buy a 11" Starrett micrometer to measure pushrod length accurately. They do wear and do vary in length.
There is sufficient lifter travel (.250") to accommodate head milling cleanup, rocker tip regrinding and other normal variation.
It's the lifters not rotating which must be dealt with:
1. Cam lobe taper not ground accurately.
2. Block baked and/or shotblasted so as to raise the grain in the machined lifter bores.
3. Pushrod being trapped in the rocker socket. This only stops the pushrod from rotating, but makes it more difficult to confirm the lifter is rotating.
If the lifter doesn't rotate, cam and lifter failure follows shortly.
jack vines
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