what is some of your guy's thoughts on using a lighter weight oil? instead of 20/50 maybe a 10/40 or 10/30? does it make a difference for a hyd. flat tappet cam?
Depends on the build. For a rebuilt engine with good tolerances 10-30 or 10-40 is great. For a factory engine with higher miles 20-50 helps keep the pressure up, especially when its 110* out.
