Richard454

I'm looking for the measurement from the back of the block ( bellhousing mating surface) to the top of the pressure plate ( where the throwout bearing rides)

Any one have this handy- or could measure it for me.

Thanks in advance-

Richard

Lt1er

I don't have a BBC on the stand right now. But I can tell you that you are going to variations in the thickness of the flywheel and pressure plates. That is why different combos use different pivot ball lengths.

I can tell you that they all fit under the bell housing. So if you have the bell housing length minus the pivit ball you would have the "X" number you requested or pretty close

Richard454

Well.....the engine is not a big block Chevy- but rather a BMW V12. I have a "621" bellhousing and a Richmond 6 speed but need to make an adapter plate to bolt to the V12.


The V12 crank flange is almost flush w/ the block-where as the Chevy is out almost 3/4 inch.

I have the measurement for the set up I'm going to run-I'm using a BMW flywheel w/ Chevy 11" PP and 26 spline disc. The BMW flywheel uses a 280 MM disc or just a hair over 11". The BMW flywheel is maybe 3MM less in total diameter of the Chevy 168 tooth Flywheel.
So- this should work really well as far a close in size.


I'm looking for some ballpark dimensions-to see what the difference was and either add or subtract to the total height of the modded bellhousing.

Richard

vetrod62

Chevy nunbers:

Crank flywheel flange to friction surface on flywheel.....
Hays #10-130,____.920"
Ram #2105,______.850"

Height of borg&beck pressure plate at highest points...
Hays #30-012_____2.750"
Ram #414________2.687"

You are on your own to figure the engine/bell housing to crank flange.