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How about you guys start your own thread about rocker arms so this thread can stay on topic?
That got so far I got people mixed up and thought the OP had roller rockers.
The Oil Pump Drive shaft somehow tore the slot in the Oil Pump in half and cracked a corner of the rear main cap...
...Your wondering how this happened. I'm not completely sure but I think it may have had something to do with my attempts at priming the engine oil system with an old distributor.
So...what happened to the plastic collar on the oil pump drive shaft?
Some aftermarket oil pump drive shafts use a metal sleeve instead of the OEM plastic collar.
Lack of guidance for the drive shaft is what broke the oil pump and main cap. Has NOTHING to do with priming the engine. Either that, or the oil pump gears locked-up due to debris. My bet is on the oil pump driveshaft collar, because there should be no debris in a new engine.
I just went with the standard volume. For the rpms this will see it will be fine.I replaced my stock driveshaft on my L31 after finding the the plastic colar in two pieces in the pan. The factory GM Goodwrench pump was a M55HV in my circa 2005 crate engine.