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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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#13118 04/22/2004 6:31 PM | Joined: Nov 2002 Posts: 55 Member | | Member Joined: Nov 2002 Posts: 55 | The 235 in my 55.2 has a Rochester Model BC carb; it's the type with an automatic choke. I'm trying to figure out why it seems to run rich.
While fooling around with it last night, I observed that if I take off the air cleaner while the engine is running, the idle speed slows down. Putting it back on causes idle speed to go back up. The air cleaner is not stock. It's a paper element that doesn't seem to have much resistance to air flow (based on my scientific test of holding it up to my mouth and blowing through it).
Is this normal? Or is this air cleaner choking the engine and could this be causing the engine to run rich?
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