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Click on image for the lowdown. 
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Mod | | | Forums66 Topics128,032 Posts1,055,519 Members48,425 | | 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!
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#40135 11/08/2003 5:46 AM | Joined: Jan 2001 Posts: 428 Shop Shark | | Shop Shark Joined: Jan 2001 Posts: 428 | The Forward Control Trucks,( those UPS, roach coach style trucks)came with PCV from the factory from about 1948. The reasoning was these trucks were used in delivery and therefore spent a lot of time idling or in low speed operation. The road draft tube needs some speed in order for it to work properly. | | |
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