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Mod | | | Forums66 Topics128,014 Posts1,055,327 Members48,419 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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For helping keep this great
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on the Internet for over 30 years! and not clogged down
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| | | | Joined: Nov 2006 Posts: 173 Shop Shark | | Shop Shark Joined: Nov 2006 Posts: 173 | I bought a donor truck this weekend for the motor and transmission. The seller said the truck was a 305 originally but that the motor has been replaced with a 350 by a previous owner. I tried to locate the casting number to determine what I have and I found this cast in the block back behind the driver side head:
-a sidways 8, followed by the GM script and
"5.7LG SGI"
I asssume the "5.7" means 350 but where from this casting is the actual casting number? Thanks, Scott
1947, 1950, & 1952 Chevrolet 1/2 ton
1952 GMC 450 series Cab Over Engine
1946 Chevrolet 2 Ton
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