I've been searching for a while but can only find small lawnmower/go cart style engines. Anyone know where to find these for like d, b, h series? I've also heard them being called rear block-face dimensions.

 

You plan on making a custom bell housing?

 

Wanted to draw a couple different varieties of adaptors on Solidworks, don't feel like reverse engineering parts. That doesn't come out quite as accurate.
If I actually ever made them would be a whole nother story.

 

Cool, I just saw a d-series rockin' a GSR TRanny @ the Nopi Nationals. Do all honda trannys have the same spline count?? I wouldn't think so. Sorry for the jack, bump anyways!!

 

Spline count as in input shaft? Usually I've seen people use the clutch/flywheel for the tranny, so it doesn't matter.
Eh, I kinda figured they weren't widely published. Too bad it's not a chevy