| |
Click on image for the lowdown. 
====
| | | Forums66 Topics128,028 Posts1,055,414 Members48,422 | | 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!
| | THANKS!
For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | 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
| | |
|
|
| |
