320HP Magnum Crate w/ X-heads

go-fish said

Pushrod oiling. I’ve never had an engine that oils through the pushrods but have read about Magnum engines that run LA heads and vice versa.

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I think you might be incorrect. The rockers have to have some sort of bearings, needle roller or brass bushings. "I bet" they are designed to oil through the shafts. You might want to do some research on this.

The Magnum heads that oil through the pushrods don't have shaft rockers. They use pedestal mounted rockers, and are designed from the get-go to be pushrod oiled.