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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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| | | | Joined: Jul 2000 Posts: 2,192 Insomniac | | Insomniac Joined: Jul 2000 Posts: 2,192 | I prefer 600 rpm for the following reasons:
At 450 rpm the ammeter reads on the "D" side even with the lights off. At 600 it seems the generator is turning fast enough to maintain charge. This probably won't be an issue if I had an alternator.
Where I live here in the Pacific Northwest, we often have outside temperatures that are close to the dew point. This can lead to carb ice. Carb ice can happen when the engine is warmed up and the choke is fully open. A slightly faster idle helps to avoid stalling when you are at a traffic light with your foot on the brake pedal. I don't have a throttle cable; if I had one I would use it.
I have not had any problem with "run on" or "dieseling" with the idle speed set at 600.
Gord 🇨🇦
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1954 1/2 ton 235 4 speed
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