Oiling vs non oiling pushrod

It is a high nickle content. 59 degree 340 Resto block. It doesn't have the upper and lower head bolts the R-3 does. This block has the factory 340 casting numbers. I wish it was an R-3 for the extra head bolts need for the heads I am using. The block will take high flex under torque with factory mounts.

Factory blocks usually need to have a front engine plate and a mid plate. so not to distort #5 or #7 cylinder walls when under high torque on launch when pulling on the mount . This usually causes the piston to come through the wall. Destroyed many factory blocks in my day.