Damn good info

Princess Valiant said
So what year did the magnum start?

What year did roller rockers start?

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

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#1. The magnum was about 93 I think.
The LA roller motors stated about 88

#2 Do you mean roller cam motors? If so about 88

#3 A 90 would be an LA roller motor.

#4 Want to do some trading on that 90 D250?