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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: Mar 2010 Posts: 10,275 Renaissance Man | | Renaissance Man Joined: Mar 2010 Posts: 10,275 | If you ever look at a stock heater core of a 55-57, one of the pipes is crimped nearly closed to restrict flow rate through the heater.
If a truck did not come with a factory heater and someone were to install an aftermarket heater which did not have one of the pipes crimped nearly shut, the result would be that you'd melt the shoes off the ole lady.
That particular swirley restrictor you found may be for preventing that.
1952 5-window - return to "as built" condition | 1950 3100 with a 235 and a T-5 transmission
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