Did any other olds besides a w31 get a big balancer on them? I have an odd one here that I've never seen before. It isn't stepped like a w31 and doesn't have ears with 1/2 round notches like 425 or 330. It's a circle like a regular ol' 455 but The outer ring is really fat. I'm charging the camera battery right now to get a picture.

I mic'd the snout and it's 2" like an olds, and has the olds pulley bolt pattern.

 

The standard balancer usually has a 1" ring thickness....... this one has a 1.365" ring.

 

 

68-69 400 G block?
I will have to look at mine.
Iv'e seen one like this before...but where, hmmm.

Went out and checked. Mine has all the holes
drilled like the fat one but is only an inch thick.

 

Well, thanks for looking. This one has me scratching my head. Just when I think I know a bunch, I get slapped upside the head and have to learn something else.

 

Yes, but it keeps us on our toes,
good for the *****....of our feet.

 

have seen those on 72 350s

 

That makes sense. There was a KB pulley in the parts lot. but there was also a handful of random other BOPC pulleys too.