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Matching Numbers
#788695 February 22nd 2022 11:01 pm
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Hey guys planning my build and I want to confirm my 1974 G10 Shorty has the original block.

My Installer pulled only one number off the block : driver side where my tranny meets the block.

The number he pulled from that location is : 3970010

I always thought the block number would be part of the vin. It's not.

I'm having him pull a number from the front of the block passenger side.

I appreciate all and any advice & experience.

Thanks Mickey

Last edited by SDMickey; February 22nd 2022 11:02 pm.
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Re: Matching Numbers
SDMickey #788701 February 22nd 2022 11:22 pm
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The motor, tranny & the frame/body #'s should match the build sheet (RPO codes) by GM, the day she was built. Thus numbers matching ...


SUNSHINE VANS-VAN DIEGO
ADRENALIN BY THE GALLON & CHASIN RACIN
ONE FOR THE DIRT & ONE FOR THE STREETS
'93 CHEVY G30 454 4X4 SPORTVAN EXT 146" WB
'92 CHEVY G30 454 BEAUVILLE EXT 146" WB
Re: Matching Numbers
SDMickey #788718 February 23rd 2022 9:55 am
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3970010 is a GM casting number and they can apply to multiple years and vehicles.
The engine number will be stamped, usually on the front left side of the block, on the deck surface next to the head. A matching number will be the same year as the vehicle and come from the correct engine plant. Different engine plants supplied different assembly plants sometimes. Some of the Chevy guru websites may be able to decode the number for you.

Details like that on the older vehicles is getting harder to find even with the internet. frown

Last edited by CatFish; February 23rd 2022 10:04 am.
Re: Matching Numbers
SDMickey #788719 February 23rd 2022 10:05 am
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That should be the part #, It will tell you years made, size. If stamped in '74 partial vin on pad above oil filter.(sequence# of vin). Look for Julian date on the block. Should be top back maybe pass side. Remember the date should be older than the van, you need the part to build it. There is a pad below the alternator pass side deck, 3 digits. You can look up the code and see years, what vehicle. You take all 3 and decide from there. Other things to think about dipstick(what side?), oil ports, 1-2 piece seal. It all paints a picture.

Re: Matching Numbers
SDMickey #788728 February 24th 2022 12:51 am
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I' m so STOKED right now: my installer sent me two sets of numbers and the 1st set matches the last six of my vin; it looks like the motor is original. The van Gods shined upon me ! It was meant to be chevy

jcd74 = Brother. I will definitely pass it on to my engine builder. I'm out of my mind right now. chevy
Appreciate your input.

Last edited by SDMickey; February 24th 2022 12:54 am.

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