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Click on image for the lowdown. 
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Mod | | | Forums66 Topics128,050 Posts1,055,683 Members48,426 | | 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: Jul 2001 Posts: 3,887 Cruising in the Passing Lane | | Cruising in the Passing Lane Joined: Jul 2001 Posts: 3,887 | AFAIK they should be the same size [5/8], someone must have mixed parts of car and truck heaters - see here, sheet 3, you want the one closest to the fender to the pump and the one towards the engine to the intake - providing the core is correct and correctly positioned Bill | | |
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