Re: Ole near oil filter and oil pressure switch.
I just looked at both my 350's. one is plugged and it doesn't go all the way through... But my other 350 (both. 010 castings both 4 bolts) goes all the way through and is open... It's just an open hole to flywheel / bellhousing area... Hope this helps.
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When in doubt, throttle it out!
1974 Chevrolet Custom K20
2005 Ford Ranger Edge
1985 Chevrolet Custom Deluxe C10
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