Bellhousing alignment

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I am not sure of your car and year, but for example: Per the 1970 Plymouth service manual, bellhousing bore runout relative to crankshaft should be within 0.008" total indicator reading. Meaning the bellhousing bore center should be within 0.004" of crankshaft center. The bellhousing face should be with 0.006" total indicator reading of the crank (and flywheel).
 
Most folks seem to miss checking the face's angle in relation to the crank/block. It does mater just as much as the bore run-out.
 
Bellhousing is bored with the engine block. That's why we should verify this when exchanging bells from one engine to another or aftermarket Bellhousings.
 
CRUZE 418 said:
Bellhousing is bored with the engine block. That's why we should verify this when exchanging bells from one engine to another or aftermarket Bellhousings.
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Not saying you're wrong, but I've never in my life seen or heard of this, and I'm wondering how that's supposed to work with a torquflite.

I'd have to red X this one
 
Well, think what you want, but I didn't pull this particular statement out of thin air.
 
jos51700 said:
Not saying you're wrong, but I've never in my life seen or heard of this, and I'm wondering how that's supposed to work with a torquflite.

I'd have to red X this one
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Somewhere I have a picture of the fixture being used at the factory. This is a well known fact. @Dan Brewer posted a pic on FB a while ago showing the fixture.

blockdept2.jpg
 
Jeremiah (jd) said:
Somewhere I have a picture of the fixture being used at the factory. This is a well known fact. @Dan Brewer posted a pic on FB a while ago showing the fixture.

View attachment 1716329935
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What’s sad is a couple of the worst bell housings I’ve indicated in were factory units that I know were OE to the car.

One was my 72 Demon. I wanted to buy a scatter shield but my dad didn’t want to because he said it would be way off.

When it came time to indicate the bell housing in, it was .080 out from about 4 to 11 o’clock. My dad thought I was BS’ing him because he knew I didn’t want it so he crawled under there and verified it.

So I ran down to the speed shop and bought a scatter shield. It was only out .020 so I sent it. I used that thing until about 2006 and I bought it in 1981.

I think two others I found were out like that. All OE and they all shifted fine, didn’t eat pilot bushings or break the bearing retainer.

My buddy had a Chevy Nova that was killing pilot bushings and it finally broke the bearing retainer.

He checked it and it was .100 out. You could shift it. It just ate pilot bushings about every 3-4 months.

I was stunned it was out that far and the gear box still went in.
 
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