The bottleneck on the stud allows the rocker to bottom out so that a torque spec can be achieved. Yes an adjustable valve train is nessesary with anything other than totally stock specs. Can you use polylocks with bottleneck studs? I don't know for sure but why bother. The straight studs are cheap and easy to install, assuming that the studs you have now are of the screw in type.
John
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John
"There are no stupid questions, but there are a LOT of inquisitive idiots!"
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