Quote:
Originally Posted by Bruce Lancaster
Yes...it is the lower passage that feeds the bearing. This is below the plug and feeds the rear main, the blind hole above the plug is the one that feeds filtered oil to everything else in the system. Oil from the pump divides BELOW the plug, a portion feeding unfilterd oil to the rear main, the remainin majority going through the filter, across to return to the vertical stack ABOVE the plug and on to the oil galleries. The rear main gets unfiltered oil straight from the pump.
The passage the ends before the rear main is the outlet from filter, the one below drilled from two directions is the rear bearing feed.
LOWER passage is into the filter, UPPER is from the filter. The plug forces oil flow through the filter and fully isolates the rear main from filtered flow. Except on racing engines with fully external oils systems, altering that is complicated, as Smokey demonstrates!
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Bruce I finally got out to the shop to look at the small block rear main.I probed the rear main oil feed hole with a welding rod.
The oil feed hole in the bearing web intersects the the drilled oil line on the other side of the plug which is where the filtered oil is coming from after the filter.The oil that leaves the oil pump has no other place to go except to the right ond on into the filter and doesn't feed the oil feed hole as it is on the other side of the installed plug.
Ronnie