How to tell if your 200 4r has a dual bolt pattern?

[BetMinesFaster]

Hey guys, How can you verify if a 200 4r has a chev and BOP pattern? It has extra holes up top that look to be chevy placment. I dont have a chev engine in the garage to fit it to....any surefire way to tell? It is a brf..TIA, Ryan

 

[MeanBuicks]

You're good. The 200-4R was made in BOP only and dual pattern bellhousings. If you have a BRF, it's dual pattern as I've never seen anything but with that code on it.

 

[BetMinesFaster]

Thanks for the info dude! Looks like im going to proceed with this 4.3 thing seeing as how I can use the tranny too.......Im fixin to catch hell for this....

 

[SSedan64]

Unibell Housing

Unibell= BOP & Chevy Housing has 10 bolt holes & 2 dowel holes. BOP only case will have 6 bolt holes & 2 dowel holes and have a V shape at the top. Chevy only case has 6 bolt holes & 2 dowel holes and comes to a point at top.