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Old 07-23-2012, 12:32 AM   #1
Gary Anderson
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Default KB Oldsmobile block

On a Keith Black Oldsmobile block, is the Oldsmobile bolt pattern different than a standard Big Block Chevrolet bolt pattern?

I am very familiar with the BBC, but the Olds stuff, not so much.
Thanks.
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Old 07-23-2012, 12:41 AM   #2
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Default Re: KB Oldsmobile block

I don't remember seeing an olds pattern on that block, just a chev pattern or maybe both? Either way the dowels and lower bolt holes are the same on both patterns.


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Old 07-23-2012, 01:23 AM   #3
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Default Re: KB Oldsmobile block

Thanks , Hutch

I try to get picture from the guy

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Old 07-24-2012, 12:48 AM   #4
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Default Re: KB Oldsmobile block

The patterns are different, moved around for intake runners I believe. The olds pattern fits DRCE1 heads, some 14 deg olds stuff and some AJPE stuff. That I remember, anyway. As far as I recall, you can't bolt conventional or big chiefs to olds pattern on KB olds
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Old 07-24-2012, 12:17 PM   #5
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Default Re: KB Oldsmobile block

you can get either pattern on the block when u buy it new but not both patterns. I have a kb olds block for the drce olds head bolt pattern and i also have a kb olds block for the standard conventional heads or the standard olds heads. I have read that the olds drce pattern was a much better design.
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Old 07-24-2012, 01:05 PM   #6
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Default Re: KB Oldsmobile block

Thanks ,guys I was looking at an KB Olds block with an Oldsmobile head pattern, but I have conventional Chevy type bolt pattern.
(Brodix)

Another question just came to mind, if the block is a solid block,(which I am looking for, either a KB or New Century.....),
could the OLDS pattern holes be filled and redrilled for a conventional Chevy pattern?

Either with tapped and welded plugs or just welding?

I have a FULL machine shop and big TIG setup in my shop.

Just curious...

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Old 07-24-2012, 05:13 PM   #7
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Default Re: KB Oldsmobile block

The threads are set in the block pretty deep BUT we've had a few new century arias' and KB's (kb600 & hemi) that have kicked a rod out, been all welded up and re-drilled. so in theory it's doable. Plus I think it's only the upper half that are moved. Note that you can have spread lifters in a KB600, double check that.
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Old 07-25-2012, 12:04 PM   #8
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Default Re: KB Oldsmobile block

The block should have the Olds bellhousing pattern also.
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Old 11-27-2012, 09:08 PM   #9
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Default Re: KB Oldsmobile block

Can somebody tell me how many head studs per each head on the KB Olds ( not a Chevy head ) ,, is it 14 per head ?
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Old 11-29-2012, 08:35 AM   #10
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Default Re: KB Oldsmobile block

you can easily look at the paper printed bolt diagram in one of the copper head gasket makers catalogs...

the block can be had originally with ANY bolt pattern that you wanted..
the threads are at least an inch and a half down inside

some even were made with larger diameter threads in certain locations....

it is not easlily changed...
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Old 11-29-2012, 08:46 AM   #11
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Default Re: KB Oldsmobile block

usually the outer cylinders ( end cyls) bolt hole that in in betweeen the center cylinders (just above center of each bore )is SYMETRICAL "evenly spaced"..where as in a common chevy, the hole is out closer to the right side...
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Old 11-29-2012, 12:07 PM   #12
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Default Re: KB Oldsmobile block

Thanks, the version I'm looking at is 14 in the deck and 4 in the valley. Rock n Roll
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