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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: Sep 2001 Posts: 29,270 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,270 |
As posted by Brad:
A PCV type of "ventilation" system was first used as standard equipment by Chevrolet in 1948 on the model 3742, a Forward Control Delivery Chassis, updraft carburetor: crankcase ventilation: "closed system, vacuum operated" (1949 description). This was not available on COEs (standard or optional) at that time.
Positive Crankcase Ventilation (by that name) was an option on COEs and some/most standard-cab large Chevrolet trucks by 1953.
In 1954, PCV was optional on all sizes of trucks with either the 235 engine or on trucks that could have the optional 261 engine. In 1954, the 261 engine was an option only on 1.5 and 2.0 ton trucks; and, the PCV option was a separate option (not necessarily installed with the 261 engine option).
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