Re: Holes in oil galley plugs ...
They did the same thing on a lot of the late 90s roller SBC truck engines too.
I drilled my own .030" holes in the plugs before I installed them when I put together my '69 350 block with a retro-roller conversion. Don't know if it helps anything, but I figure GM wouldn't have done it on the later roller engines if they didn't have a reason. It certainly doesn't hurt, as I still have good oil pressure with a low volume Chevy II Melling front sump oil pump.
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