Olds Rocket block info needed - Hot Rod Forum : Hotrodders Bulletin Board
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Old 01-27-2008, 05:22 PM
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Olds Rocket block info needed

I'm looking for some info on a oldsmobile block like how to identify it and casting numbers would be great. It is compatable with small block chevy parts, but is a tall deck block with a raised cam location for big stroke cranks, I think the bore is around 4.25", there are both dry and wet sump models. These blocks can be used to make huge small block chevys. If anyone knows the casting numbers, what these originally came in, or quick ways of identifying them let me know.

Thanks,
Tony
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Old 01-27-2008, 06:09 PM
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I've had a couple of these, currently a tall deck 434. An easy way to id it is by the scalloped sides of the block, the splayed main caps and the Oldsmobile insignia on the sides. They were machined as either standard deck, 4.00 bore, and 2.45 mains or +.300 deck, 4.125 bore, and 2.65 mains. Max bore is 4.185. All have spread rails, raised cam, big block cam journals, priority main oiling, dual starter mounts, and no oil filter provision. The only thing they ever came in is a crate. The Dart Iron Eagle is the same block.
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Old 01-27-2008, 06:12 PM
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I believe that you may have your info confused. First and foremost, I doubt that you could get any block that accepts sbc architecture anywhere near 4.25 bore. It has about 4.48 bore spacing(that the crank has some obligation to conform to) which would give you less than 1/4" between bores...hardly enough to seal any type of combustion gases. I also think that you may be talking about an aftermarket block and not really an Olds block. I do know there are a couple of aftermarket blocks, I believe one is called an "Olds", that uses BBC parts. I will acknowledge that I'm not an Olds expert, however, I am sure that I would have heard about that at some point in time. There was also a period of time when GM was swapping "350" size engines between model lines, I think it was primarily Chevy engines being installed in other cars...including the Olds. I think the block you are looking for is an aftermarket block and not an assembly line one.
I see that Dirt Car 18 pretty much reiterated my comments about it being a production engine.
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Old 01-27-2008, 07:21 PM
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I think he is talking about the Rocket Block back in the 90's when Old's was racing at the strip.
Now it's Gm's new block that you can build a 502 with.
http://www.gmpartsdirect.com/perform...CATID=628.html
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Old 01-27-2008, 08:40 PM
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Sorry, I was going off what I had heard from some people. I just found the block, its from GM performance parts not a factory piece. I was thinking olds because of the rocket name and emblem.

Thanks, for the replys.
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