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Click on image for the lowdown. 
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Mod | | | Forums66 Topics128,147 Posts1,056,801 Members48,454 | | 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: Jan 2008 Posts: 4,962 'Bolter | | 'Bolter Joined: Jan 2008 Posts: 4,962 | The heat riser only comes into play when the engine is completely cold. Once the engine has warmed and the heat riser opens, it stays open. What kind of fuel mileage are you getting. Your expectations might be too high for 55 year old engineering. | | |
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