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Mod | | | Forums66 Topics128,179 Posts1,057,159 Members48,465 | | 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: Apr 2009 Posts: 554 'Bolter | | 'Bolter Joined: Apr 2009 Posts: 554 | It is possible that that the sticker in the window actually says NOX approved. During the early, retro-fitting years of smog devices many vehicles had to be fitted with system that decreased nitrous oxide (NOX) emissions. Seems like it had something to do with limiting ignition advance. I do remember that unlike the PCV systems, the NOX systems decreased performance.
Chuck | | |
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