Re: Oil flow - filter by pass - 427 PF141
But... but.... that's what the bypass is for. 
back in the day when GM quit selling aluminum BB and smitty at yenko had not yet gotten theirs made i used a block supplied by the customer that was cast by dove engineering in ohio. against my better judgement i built a circle track 454 engine. the first night the oil pressure went from 70# to about 40# at the end of the races because the coolant was getting into the oil because the block was so porous and the water was swelling the paper media in the filter causing the holes to close up and the flow was restricted so the pressure was dropping. if i had not blocked the filter bypass we may have never caught the problem till it was too late and the engine was ruined. i called my contact at GM about my problem and they had just came out with the PF 35L which had a synthetic media that did not swell in water. this solved the oil pressure problem but they still had to drain the water from the oil after every race. the engine ran this way for years without any damage.
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