All are correct on the changed formulation. I run my racing jimmys on diesel based oil since I run flat tappets. On assembly make sure you always use a good assembly lube on cam/lifter combos. I use Prolong.

With the formulation change in the oils I would also reccommend the use of the GM assembly oil "EOS". Add one quart if you are using a large pan and 1/2 qt for a 6 qt pan.

Using the spring pressure for your RPM application can also help eliminate problem down the road..Good Luck...#35


216.158 MPH 12-Port 302 GMC on 70% 171.0 MPH 302 stock head on gasoline 7 years later