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BBC Forged Crank

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Old January 13th, 2021, 06:25 AM
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Unknown Crank

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Last edited by Magna86; January 20th, 2021 at 12:34 PM. Reason: Incorrect
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Old January 13th, 2021, 03:56 PM
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BBC Forged Crank

Are you sure that's a BBC crankshaft? Somehow the keyways don't look right.
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Old January 13th, 2021, 05:51 PM
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That does not look like a big block chevy crankshaft.
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Old January 13th, 2021, 09:16 PM
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Looks more like a Chrysler Big block 413-440 RB stroker crank.

Last edited by Lonnies Performance; January 13th, 2021 at 09:18 PM.
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Old January 14th, 2021, 02:56 AM
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If I am wrong let's identify it. I'm going off what another member said. Would a picture of the flywheel flange help? If it a different crank what's it worth so I can find a new home for it.
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Old January 14th, 2021, 04:50 AM
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It appears to have an 8-bolt flange on the back; definitely NOT BBC. I know the Mopars used that pattern. How about the casting #? Then we could solve the mystery. Thanks, Bob.
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Old January 14th, 2021, 06:06 AM
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There are no casting numbers or lines on the crank. Only numbers are whats stamped into the counterweight that I listed in the original post. Its aftermarket but I don't know by who.
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Old January 14th, 2021, 09:46 AM
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Old January 14th, 2021, 05:28 PM
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Hey MAN

Why did you not take it to a machine shop
the ones I saw with 2 keyways were on blower engines Just saying

This is NO an Oldsmobile part
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Old January 14th, 2021, 05:34 PM
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Originally Posted by 11971four4two
.........This is NO an Oldsmobile part
It's NOT listed as an Oldsmobile part.
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Old January 14th, 2021, 08:15 PM
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OK
tell me what it is

douce
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Old January 14th, 2021, 09:13 PM
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This was an Oldsmobile website..

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Old January 15th, 2021, 04:27 AM
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Originally Posted by 11971four4two
This was an Oldsmobile website..
"Non-Oldsmobile Classified"
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Old January 15th, 2021, 05:34 PM
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Rods are 2.38 and mains are 2.70 if this helps anyone I'd this crank. This is with tape and a tape measure then divide by π

Last edited by Magna86; January 15th, 2021 at 05:49 PM.
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Old January 15th, 2021, 07:25 PM
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Originally Posted by Magna86
If I am wrong let's identify it. I'm going off what another member said. Would a picture of the flywheel flange help? If it a different crank what's it worth so I can find a new home for it.
Why don't you do some research & look at the Chrysler crank I mentioned.... Maybe you will find your answer.
I'm trying to help you, but it is your responsibility not to misrepresent something, not mine.

There is not a casting number because it is not a CASTING but an aftermarket forged crank.
Aftermarket cranks did not typically have forged in numbers but stamped numbers as you showed..

It has a dual keyway as it was likely built for a supercharged application.

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Old January 15th, 2021, 08:46 PM
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Reposted thread closed

Found out it's a top fuel crank that can't be run in a street motor unless machined for pilot bushing/ torque converter

Last edited by Magna86; January 20th, 2021 at 12:37 PM.
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