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Are you sure you have a adequate supply of oil from the #4 cam bearing? Possibly a restriction somewhere? Maybe spun the cam bearing?

If it oils enough through the block and head, maybe no oil is getting by the hold down fastener? Is it a stud or the factory bolt?

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I have no idea if it has adequate supply? Id think it might as it oiled fine with the stock adjustable rockers. How do you measure that? I dont think the bearing is spun. The cam journals in this block are WAAY tight with fresh bearings. Machinist scraped the bearings to fit the cam...I paid him to machine the block, but as usual, took it in the shorts

As far as fasteners, right now it has studs in the feed holes...

On a side note, do you tighten the stud till it stops or ??