Re: Can you confirm a big block by VIN with no spid?
If you find a emissions sticker that reads 402 on the LH inner fender, engine compartment, odds are high it's original. The BBs have a stamped number on them, which you can find through this website. I had thought the VIN stated as well, but it's been a lot of years since I checked.
Like the previous poster said, the weight is different too. You can find that info. on this website as well.
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Tony
71 Custom Deluxe, SWB, 2WD, 402, A/C.
I developed an assembly guide (kit) for restoring this truck from the ground up, complete with details including full hardware descriptions. Much of the info. applies to all 67-72 GM. My build thread, with some info. about the assembly kit https://67-72chevytrucks.com/vboard/...d.php?t=730025
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