Most of our engines see stresses well in excess of any boosted engines. The difference is those engines are overhead cams, our old pushrod require massive spring pressures depending on cam profile, throw in roller lifters (more mass) and we are running 400lb plus open and 150 plus seat. I bet the overhead cams are in the range of 80lb seat and 130 open. The wear we suffer on pushrods, rocker arms and camshafts.
Regardless of your
oil, regardless of your set up, throw in some redline break in additive and get the
zinc and phosphorous to about 1300 ppm. I would much rather have the cheapest dino
oil and the additive than the most expensive
synthetic (excep RP XRP $15.00 per quart it has 1400 ppm of
zinc/phosphours) than
synthetic.