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Author Topic: Chevy Crankshaft  (Read 764 times)

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Offline manta22

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Chevy Crankshaft
« on: June 19, 2023, 07:27:52 PM »
Years ago I bought a forged steel SBC crankshaft. I have been trying to identify it by its markings but I have not found this number on any Chevy parts list. As close as I can read it, it is: 1951628. There is a chance that the last digit could be a 9. Can anyone tell me what it is?
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Regards, Neil  Tucson, AZ

Offline John Burk

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Re: Chevy Crankshaft
« Reply #1 on: June 19, 2023, 10:25:21 PM »
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Offline jacksoni

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Re: Chevy Crankshaft
« Reply #2 on: June 20, 2023, 11:02:58 AM »
Naturally, your number is not on the list John B supplied. Measuring the journals, stroke and 1 or 2 piece determination would help as a start. And are you sure is forged vs cast?  Casting numbers can be hard to read too. Yah, I am no help but be interesting anyway.
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Offline DallasV

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Re: Chevy Crankshaft
« Reply #3 on: June 20, 2023, 03:43:39 PM »
Quote from: manta22 on June 19, 2023, 07:27:52 PM
Years ago I bought a forged steel SBC crankshaft. I have been trying to identify it by its markings but I have not found this number on any Chevy parts list. As close as I can read it, it is: 1951628. There is a chance that the last digit could be a 9. Can anyone tell me what it is?

could it be 3951628? that would make more sense to me
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Offline floydjer

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Re: Chevy Crankshaft
« Reply #4 on: June 20, 2023, 03:47:31 PM »
Small journal 327.
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Offline manta22

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Re: Chevy Crankshaft
« Reply #5 on: June 20, 2023, 08:27:57 PM »
Quote from: DallasV on June 20, 2023, 03:43:39 PM
Quote from: manta22 on June 19, 2023, 07:27:52 PM
Years ago I bought a forged steel SBC crankshaft. I have been trying to identify it by its markings but I have not found this number on any Chevy parts list. As close as I can read it, it is: 1951628. There is a chance that the last digit could be a 9. Can anyone tell me what it is?

could it be 3951628? that would make more sense to me

I took a very close look with a flashlight and it very well could be "3951529". the numbers are very hard to read.

If so, this makes it a 400 large journal crank. I measured the main & rod journals and they are, indeed 2.640" & 2.090" corresponding to the "+10" markings written on the crank. It is a 3.75" stroke and is a cast crank, judging by its thin parting line. A decent street SBC crank. Thanks, Guys.
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Regards, Neil  Tucson, AZ

Offline floydjer

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Re: Chevy Crankshaft
« Reply #6 on: June 21, 2023, 03:08:48 PM »
Pleased to read you figured it out Neil. 1drink
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Offline floydjer

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Re: Chevy Crankshaft
« Reply #7 on: June 21, 2023, 05:40:17 PM »
Tape this to your wall.
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Offline manta22

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Re: Chevy Crankshaft
« Reply #8 on: June 21, 2023, 06:19:06 PM »
Quote from: floydjer on June 21, 2023, 05:40:17 PM
Tape this to your wall.
Thanks, I'll do that.
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Regards, Neil  Tucson, AZ

Offline salt27

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Re: Chevy Crankshaft
« Reply #9 on: June 21, 2023, 08:57:40 PM »
Quote from: floydjer on June 21, 2023, 05:40:17 PM
Tape this to your wall.


The flange on the 302 crank is the same as my marine 283 crank.

I believe it is because of the forged pistons used in both.
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