Quote:
Originally Posted by nhramnl
It's actually a small cup plug (on early Bowties I think it was .500 in diameter, on later blocks, .470. It is pressed in, and is under the rear main. I had an almost season-long problem failing cam bearings and lifters because the engine machinist removed the plug (to bottle-brush the oil galleys) and forgot to reinstall it. There was very little oil going up-top, and invariably, at least one of the cam bearings would turn. Finally got to the point where I said "No more bearings and camshafts and lifters, because it can't possibly be bad or improperly installed parts...again". We did a deep-dive for weird, uncommon problems and somebody who had experienced the same thing straight-out said "Your engine guy removed the plug and forgot to reinstall it".
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You really should look and see how the oiling system works on a SBC if that plug is left out under the rear main cap once the oil filter is full the oil goes the path of less resistance and will by pass the filter.
Here is a thread to verify what I am saying.
http://speedtalk.com/forum/viewtopic...er=asc&start=0
Here is a pic of what I am talking about. Its a good idea know what your talking about before posting like that!!
