Just bought some used Edelbrock RPM 340 heads... for my Magnum

vitamindart said

I believe some of the early magnum blocks are drilled for LA oiling. not sure how big of a pain drilling a block would be.

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They were, my Magnum is pretty late build though it's a 2001 MY. I think I will most likely just do an external (from the block) oil feed directly to the rocker shafts, drilling 6" into cast iron sounds like a bad time.