Different Bell Housings?

[dereklola]

Are there different bell housings for different engines? 230 vs 252, S2 vs S1 or early versus late?

The two 25500153 blocks I've got have the lower holes [the ones almost level with crank centerline] about .25/.28/.30 lower than the drawings in the Power Source manual. These drawings do state 3.8L (230) - but they also show other info for S1 and for S2 [manifold differences etc].

It's the block I'm interested in - I just used the bellhousing for reference.

What's up? Thx.

Derek

[EightSecV6]

I have never seen a different bell hsg pattern on a Buick, they are all the same.

[turbodave]

I'm with Bill, I think they're ALL the same. V6, V8, S1, S2, whatever.

[dereklola]

Thx for your replies.

Are mis-machined blocks common? Seems strange to me that I've got two from totally different sources with the same difference.

Fortunately I think I can work around it - just curious. I was planning do do this the "proper" way by using factory dimensions - looks like I'll have to do it the the "shade tree machanic" way after all!

Thx - Derek

[KendallF]

Thx for your replies.

Are mis-machined blocks common? Seems strange to me that I've got two from totally different sources with the same difference.

Fortunately I think I can work around it - just curious. I was planning do do this the "proper" way by using factory dimensions - looks like I'll have to do it the the "shade tree machanic" way after all!

Thx - Derek

Derek,

I would guess that the drawing's in error, if your measurements are consistent from block to block. I have never bolted up a block and seen that amount of mismatch. Now I'm going to have to go measure the 3 I have at the house! :marchmell

Remember though that the bolt holes have some slop, intentionally. The dowel pins are supposed to locate the block w/respect to the bellhousing.

[turbodave]

Derek,

I would guess that the drawing's in error, if your measurements are consistent from block to block. I have never bolted up a block and seen that amount of mismatch. Now I'm going to have to go measure the 3 I have at the house! :marchmell

Remember though that the bolt holes have some slop, intentionally. The dowel pins are supposed to locate the block w/respect to the bellhousing.

3 :SHOCKED:

[dereklola]

I agree about the dowels locating and the bolt/stud holes having some slop - but 1/4"??

I just measured my two blocks (by hand) the dowel holes and the bolt holes just below them are 1.88" center-center. They are not quite vertically in line but near enough for this purpose. The drawing shows their vertical heights to be 1.61 c-c apart.

Can someone elso measure their block(s) by hand and see which of the above they have. Even a scale measurement would help!

Derek

[turbodave]

I just measured both of mine (because of the dowel issues I'm having), and they both measure 1.88 c-c which does seem to be in direct contradiction to the Power Source manual.

The manual also calls for .625 dowels, but the Buick dowels are .6205 :confused: Doesn't matter, my holes are only .501 anyway, so either I have to machine the holes to fit the dowels I have or machine the dowels down (half of their length that is) to fit the holes.

My guess would be your blocks are OK.

[dereklola]

Thx Dave - I'll sleep better now.

Also my dowel holes measure .620, presumably for .6205 dowels.
Never believe all you read.

Derek

[dereklola]

In case anyone interested - there are two more back-of-block holes wrongly dimensioned in the Power Source Manual drawings. The two bolts at 2 and 10 o'clock are shown about 3/4" high. Even a BIG hammer won't correct that much.

I guess 4 correct out of 8 is not bad batting - but I'm wondering whether I've wasted my money buying the Manual and it hasn't even arrived yet!

Derek