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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: Jun 2010 Posts: 301 'Bolter | | 'Bolter Joined: Jun 2010 Posts: 301 | Just pulled the heads off of a 1970 307 and found most pistons stamped on top with a K, one with a J, one with an H, one with a 10, and one with a 14.
What are we talking here? I haven't seen letter on pistons before.
1949 Chevy 3600
1975 W-25 Hurst Olds
1970 GMC 1/2 ton Fleetside
2010 Chevy Silverado
| | | | | Joined: Jun 2010 Posts: 301 'Bolter | | 'Bolter Joined: Jun 2010 Posts: 301 |
1949 Chevy 3600
1975 W-25 Hurst Olds
1970 GMC 1/2 ton Fleetside
2010 Chevy Silverado
| | | | | Joined: Jul 2013 Posts: 200 'Bolter | | 'Bolter Joined: Jul 2013 Posts: 200 | Many of those mystery numbers and letter codes only have meaning to GM and/or the persons sorting those components into groups for assembly. They mean nothing to the average guys on the street like us. Every once in a while you'll even see a green paint dot or orange paint dot on them also. Just some method for them to group or organize them prior to assembly. It could have to do with the weight of them or the actual size of the piston skirts...who knows, its not important to us though.
We cannot solve our problems today using the same thinking we used when we created them!
Albert Einstein
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