<VV> (no subject)

[Brian]

Thanks to all including Lon.  Shows you're never too old to learn something new.

---------- Original Message ----------
From: BobHelt at aol.com
To: 62vair at gmail.com
Cc: virtualvairs at corvair.org, bmoneill at juno.com
Subject: (no subject)
Date: Mon, 7 Oct 2013 15:29:38 -0400 (EDT)

Hi Mark,Apparently you are not aware of the story, so here is a reasonable repeat of what happened. In About April 1962, the Tonawanda engine assembly plant discovered that their bearing supplier had supplied some #1 main bearings with "mis-matched flange" thicknesses. So production engineering studied the situation and found that those bearing couldn't be used as is, BUT production had to continue. So they issued a Tech Bulletin stating that only one half of the flanged bearing would be used and the other half would be the same as the #2 and #3 main bearings. Thus, production continued until the supplier could supply the correct #1 bearings.This correction happened toward the end of 1962. But unfortunately, this problem and the solution got announced to the bearing industry manufacturers and suppliers. So the bearing industry started manufacturing replacement bearings with this combination of half flanged #1. The whole industry converted. And they NEVER went back to the original configuration. But Chevrolet DID. So there are STILL many main #1s being made and sold with the half-flange. The good news is that the half-flange works perfectly well. It just looks strange. HTHRegards,Bob Helt     I fully intend to check the clearances using
full flanged bearings. Brian, that is all you can do. Maybe some blocks were machined differently
for some reason and they did the half flange to prevent it from being too
tight. Do check for that, my engine was at the inner limit with two flanged
halves in there.

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