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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!
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| | | | Joined: Jun 2006 Posts: 34 Apprentice | | Apprentice Joined: Jun 2006 Posts: 34 | I think it's a 250ci engine, but when I bought plugs today for a 1971 250ci the plugs were the 5/8" plugs and the ones in there are the 13/16" plugs. Also the threads were twice as long on the bigger plugs.
On the head toward the back passenger side is 4487 toward the front passenger side is 4485 F 20.
On the block toward the back passenger side is CCON2 21 4 and in the middle passenger side is 3850817 0 then underneath that a GM then under that 20.
Thanks in advance,
-Jon
1955 Chevy Dumptruck
2003 Chevy 2500HD: Crewcab, Longbed, 2wd, 6-speed manual
2005 Pontiac GTO: 500hp and a transbraked TH400
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