BBC and LS bellhousing compatibility

[davepl]

It looks like companies make dedicated LS swap bellhousing, but does anyone know why?

It looks like my BBC unit (a Keisler) will fit just fine, at least dimensionally. And I added an LS flywheel, but if not for locating dowels the BBC clutch and pressure plate would -appear- like I can just bolt them up.

I've heard rumblings that the LS flywheel surface is further away from the trans than in a big block, but really don't know of any differences.

Anyone? Remove the dowel pins and it all just works, or throw it all away and buy LS-specific stuff, or some combination?

Thanks,
Dave