Reply to "Oil discussion"

As far as what oil to use, it depends on what clearances the engine was built to use. Older engines are often built with larger bearing clearances so thin oils won't give the support the bearings need. 20W50 sounds correct as Roger's engine builder was an old-time dirt-track sprint car builder. Its been 14 yrs so I may be mistaken, but I don't think your motor had lifter bushings for the solid roller cam. It does have an aluminum flywheel which lets it rev up like a motorcycle. I think the cam is a reduced-base-circle type, as the 1st cam they tried lifted the tappets high enough so the oil bands cut into the lifter bodies were exposed, causing 16 massive oil leaks every turn of the crank. Roger's builder was on the phone to Comp Cams seconds later about that screw-up! I don't believe he used Comp for any future builds. The Jesel shaft-mount roller rockers were needed as your SVO C-3 heads were configured for them; stud-mount rockers wouldn't fit those heads.