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PostForum: GM Performance Forum   Posted: Wed Oct 17, 2018 11:36 am   Subject: L31 Engine

I have a 1990 C1500 that I will be doing an L31 engine swap on soon. The donor vehicle is a 2000 C3500 VIN 1CGC34R1YR164395. I have heard that some of the 5.7's came with a forged steel crank and I wa ...
 
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