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I have heard complaints on various forums about the lack of availability of “B” engine main bearings. Especially “B” large thrust main bearings. I have a 1978 400 block that I thought I might work on so I figured I should see about some large thrust main bearings. I called seemingly 100 places...
Somebody gave me this block a few years ago so I thought I would dig it out and work on it. My records don't show this casting number. 4006630-440. I don't know what those 2 tapped holes are in the front of the #1 cylinder are. Guessing I'd say it's a truck block. The VIN stamping is hard to...