If you're using a double-row high performance timing chain, it's a good idea to install a nylon thrust button that keeps the cam from walking back and forth in the block. That causes ignition timing variations. Regular flat-link timing chains are stiff enough to get by without using thrust control. I like to braze a flat washer to the outside of the timing cover on race engines to reinforce the cover where the thrust button contacts it.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
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