Will an 11" clutch fit under all BOP bell housings? Is the same bell used for any Olds manual transmission? As far as I can research there is no difference in 442 or Cutlass bells. I want to put an 11" behind the 425 engine with four speed.

 

Yes, your flywheel will accept either size clutch. No problem fitting inside the Bell Housing.

 

I'm not sure but I think they will, here is a pic someone has this one for sale saying it will fit. Hope it helps you.

 

BBOs came with an 11" clutch from the factory.