Thanks for all the responses......The motor was broke in on an engine dyno(inner springs removed) using 30w Pennzoil and Hughes additive....Since then made about 20 passes or so down the track using Pennzoil 20W50 + additive and was looking to change to a straight oil....So thanks again!!!

btw....Intake Valve Lift 1.6 .614"
Ext Valve Lift 1.6 .626"
Hughes springs,solid lifters & Hughes roller rocker setup