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Click on image for the lowdown. 
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| | | Forums66 Topics128,108 Posts1,056,239 Members48,437 | | 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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on the Internet for over 30 years! and not clogged down
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| | | | Joined: Jan 2009 Posts: 16 New Guy | | New Guy Joined: Jan 2009 Posts: 16 | I am trying to find out the size of my 6. I have searched and cannot get the info. # B 223452733 head # 2138477 This motor is in a 3/4 ton gmc | | | | | Joined: May 2001 Posts: 7,438 Extreme Gabster | | Extreme Gabster Joined: May 2001 Posts: 7,438 | The first 3 numbers of a GMC engine number are the engine size. Yours is a 228. You mis-read the 8 as a 3. | | | | | Joined: Apr 2006 Posts: 506 Shop Shark | | Shop Shark Joined: Apr 2006 Posts: 506 | Head casting 2136477 (with a 6) was used on three different engines until 1952:
228 with block casting 6107326,
248 with block casting 6107328,
270 with block casting 2135416
-Tom
1950 Chevy 3100 w/ 1956 235
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