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Old 07-21-2010, 02:09 AM
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400 SBC rear main, which seal?

I notice I get an "oversize" and a regular seal when looking for it, and after a little reading around found that one is for an align-honed block.

I know my truck has had rebuilt internals (bearings, rings, valve guides, oil pump that I know of) but have no idea if it was align-honed at all since I did not rebuild it, and the man that did the work is R.I.P. bless his soul.

Is there anyway to visually tell the difference once you have it all apart? I will have the transmission out of the truck also, so I can get a good look. Any help is appreciated, thanks guys.

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Old 07-21-2010, 02:48 AM
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Visually, you will see a different looking finish on the inside of the caps and block saddles, and the caps' bottoms will also show an indication of having been machined recently.


If you wanted to determine what the c/c measurement of the crank and cam- which would also indicate if the crank centerline had been moved by boring/honing, you could install the cam and crank then measure the overall distance of those two installed components (called "measure over shaft" or MOS) in the engine as shown below.

From HERE:


The formula is: center distance = MOS - (crank diameter/2) + (cam diameter/2).

Last edited by cobalt327; 07-21-2010 at 02:59 AM.
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Old 07-21-2010, 05:34 AM
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Edited,,,geezerbrain...

Last edited by BOBCRMAN@aol.com; 07-21-2010 at 06:12 AM.
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