Originally Posted by HardcoreB
Originally Posted by greendart408
I recently purchased a old school built in 74 340, and not ran since. Trw full domes, crane r280/427, 108. Mopar part number P3690795 Solid roller, block is o ringed. Etc etc, It’s a killer old school build. Anyhow does anyone know what the spring is that cam calls for pressure wise? I can’t find any info. The box of springs that came with it and was ran in the garage only says 475 on the paper work. Unfortunately it’s a cast core it looks like....

I'd map out the events at .200" and post and 'we' can recommend something based on the rocker ratio and rpm etc. It looks like the lifters have been run, they show some signs of 'forking' Cool find anyway!

They have been ran in the garage and at 1 sand drag in 1974.