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| | | Forums66 Topics128,081 Posts1,056,078 Members48,434 | | 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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| | | | Joined: Jul 2009 Posts: 27 Wrench Fetcher | | Wrench Fetcher Joined: Jul 2009 Posts: 27 | Folks I need help on locating a de coding mechanism or chart for chevy and gmc intake and exhaust manifolds.At the same time I'm needing help on telling which of these blocks are 230 and which is a 250; bl ef 3235444 ,gm 7 473433,and last of 3 is a66 836010-2.AS A last favor can you direct me to a gm manual transmission de-coding source? Thanks alot gang.Sid Stephenson | | | | | Joined: Sep 2006 Posts: 841 Shop Shark | | Shop Shark Joined: Sep 2006 Posts: 841 | some 230s and 250s share same code. might see if you can see piston top thru plug hole. | | |
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