The importance of measuring bell housing runout.

Ken Imthurn said

The factory offset (aftermarket) dowel's come in .007, .014 and .021" settings. So if your total is .028 a .014 offset dowel will get you back to center.

Click to expand...

I don't think the dowels are stackable, meaning a pair of .014 dowels will adjust the BH .014" not .028". At .028", a pair of .021" dowels reduce the TIR to .007"; out of spec for a Tremec. I'm the FBBO member that Greg mentioned at the beginning of this thread. The TKX is going in the Coronet and we've had a hell of a time measuring the runout. Not the measuring itself, we've gotten pretty good at setting up the base and indicator and replicating measurements - for the most part. We left last night with the runout at .048" - .024" TIR. A pair of .021" Robb Mc dowels would bring the BH below the .005" spec. We removed the BH before calling it a night.
This morning I reinstalled the BH and measured again just for S&G's, and the runout didn't get any closer than .056" / .028" TIR. I'm lost, and frankly a bit defeated.