[Gordon Levy]

Rocker girdles to help reduce some deflection aspecially if you are using 3/8" studs. 7/16" stud generally don't need a girdle unless you use turning over 8000 revs repeatedly. Engines that turn that many revs we use shaft rockers.
I like to see a freshen done on an engine after 25hrs of track time.
Then we tend to turn ours 8-9000 revs on a regular basis at the track.

High quality engine parts are a requirement for longevity if you plan on running it hard. With engine parts, You get what you pay for.