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I like to oil the rockers full time first and then use a .040 restrictor in the oil feed to the rockers, head or block, both work



Yeah, something like that. I've been getting my #4 cam journal's grooved for full-time oiling, but was thinking it might be helpful to be able to control the passage size actually feeding the rocker shafts.

Something on the "top half", rather than requiring the heads to be pulled to change, would certainly be better.