Pontiac bellhousing

[Old Iron]

Does anyone have a Pontiac bellhousing bolt pattern? 326, 389, 421, 428, 455 are all the same.
BOP bolt pattern
Buick, Olds, Pontiac
Thanks in advance Jim

[bripoe]

Someone with more skills than me could draw this up.

Brain

Adapter.jpg

[Old Iron]

Thanks for posting this pic.
I should have been more precise. I'm needing the part for a 1965 up because they are different.

[Nacs Fab]

I drew the boltpattern some time back. This is not at all a bellhousing shape, its only the bolt pattern holes.

[Old Iron]

Thanks for posting this file. It's what I needed!!!!!!!!!!!!!!!!!!!!!

[Old Iron]

This is the adapter file I made from the two files posted on this great sight.
BOP (Buick, Olds, Pontiac and Cadillac) to Chevy transmission adapter plate.
I haven't cut this yet and it may need a slight bit of tweaking.

[Nacs Fab]

Nice Work!

[Peechy]

Holy !! This is getting very good Thanks for the share!

[Binderman01]

I'm assuming you are using 1/4" or something similar? What are you doing to make up the distance between the torque/flexplate, clutch/input shaft out of curiosity?

[Old Iron]

Binderman, all that's needed is 1/8" material and the torque converter collar has enough length to accommodate the extra 1/8".
I've installed three of these so far without any problems.
If you were still concerned, you can use 1/8" spacers between the flex plate and torque converter.