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Click on image for the lowdown. 
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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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#32178 03/23/2004 7:51 PM | Joined: Jun 2000 Posts: 2,773 'Bolter | | 'Bolter Joined: Jun 2000 Posts: 2,773 | The hear riser doesn't directly affect the idle, except when the engine is cold. All it does is warm the intake manifold with exhaust. Without the spring, the valve stays open. When the engine is cold, the spring closes the valve allowing hot exhaust to go to the intake.
Fred
52 3600
69 C-10
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