73-87 Chevy _ GMC Trucks > Engine/Drivetrain

1987 V10 Engine Block Question

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eastalan315:
I have 1987 v10 that I’m in process of restoring with my son. Appears that at some point there has been a different engine installed so I’m wondering if anyone can help me identify what it is so can get like new gaskets and belts for it.
Thanks in advance. 
Alan


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ehjorten:
A search for GM Engine Casting Number 3970010 on the interwebs indicates that is was used from 1969 to 1979 on 327 and 350 SBC with either 2 or 4-bolt mains. Are the stamped letters and numbers still on the front passenger's side pad?

eastalan315:
Here is some pics of other markers on the block. Although don’t see any on passenger side.  Thanks Alan


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eastalan315:




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eastalan315:
Need help with identifying the engine type in this truck. My son and I are in process of doing a restore and obviously someone along the line has dropped a different engine in this truck.  Need help knowing like what belts and gaskets to order for replacement.  Thanks Alan





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