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Click on image for the lowdown. 
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| | | Forums66 Topics128,022 Posts1,055,362 Members48,420 | | 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
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | Joined: Sep 2001 Posts: 29,269 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,269 | F0306J is not a GMC code - it is a Chevrolet engine code. That is a Chevrolet engine valve cover (late 1955 or later 235/261). Post your codes from the locations shown on this page.1. Engine Serial Number 2. Block casting code 3. Block date casting code 4. Head casting code 5. Head date casting code | | |
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