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Click on image for the lowdown. 
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| | | Forums66 Topics128,131 Posts1,056,724 Members48,454 | | 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: Jan 2001 Posts: 5,337 'Bolter | | 'Bolter Joined: Jan 2001 Posts: 5,337 | I never tried to document all the subtle changes Chevrolet made through the years, but there were a few. Any time a change was made they got a new number.
Chevrolet experimented with the location of the vent hole, they also increased the hight of the backbone of the rocker as time went buy.
If the correct internal groove is used, and they contact the valve in the center, that is all I was ever concerned with.
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