What is the proper length supposed to be for push rods.
I have some out of a 292 (1959) that are 8.129 inch (new style rockers) I just checked the ones out of a 312 I am rebuilding with old style rockers and they measure 8.225 inch. I would like to use the push rods and rockers out of the 292 because I know they have less mileage on them. I cannot find any info on the longer rods. Can I still use then with newer style rockers. Also, Under the 312 rocker arm base are Diamondish shaped stampings not in the 292. Are they for oil direction and is that why there is a length difference. Do I need them?

I have been sitting behind a YBlock for 50years