<VV> VirtualVairs Digest, Vol 120, Issue 62

[Smitty]

Just bought a rampside that had pushrod seals leaking, a friend and I put 
the seals in and was going to put the engine on #1 to adjust 6 of the 
valves, there is no marking on the crankshaft pully.  Looked, felt, and 
scraped paint there was nothing.
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Smitty Says;  Ran into one just a few days ago.  Did a very thorough job of 
scraping, brushing, and wiping.  I guarantee no marks were there.  Looked 
very much like a GM original.