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8 members (68ironhead, GMCJammer51, Bill Hanlon, Gdads51, TrknGMC, 53 green 1- ton, msmall, 1 invisible),
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Global Mod,
Mod | | | Forums66 Topics128,086 Posts1,056,094 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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on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | Joined: May 2009 Posts: 13 New Guy | | New Guy Joined: May 2009 Posts: 13 | Hello,
I just bought a 56 gmc pickup.
Now i'm trying 2 indentify the engine, but i'm a newbie so can someone help me with some directions.
The block is green underneath the red paint so i think it's a pontiac block.
Some numbers I found are:
1018PY2103 (Serial number)
A756H16416 (Block front of the passengers site)
GM-522010-10 (cilinderheads)
D236 (cilinderheads the 6 could be a five difficault to see)
GMC-2331212-5CC (back of the block passengers site)
3-4-55 (back of block drivers site)
518688 GM-4 (Exhaust manifold)
CA-55-5754 (Is the plate on the hydramatic)
THNX
D.
(from The Netherlands)
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