Damn good info

Princess Valiant said
So what year did the magnum start?

92/93-5.2-5.9 IIRC

What year did roller rockers start?

They never came with roller rockers but the first appearance was in the late 30’s drawing table designed for air craft, but again, IIRC. AUtomotive wise, it was the 50’s on drag engines.

I have a 90 360 in a D250, is that a magnum?

LA roller