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I have installed a Holley 4360C carburetor in my Chevy 350 after clean adjust change a small jets the spark plugs still looking dark. Do you think this problem coming from the HEI distributor?
Wiki User
∙ 15y ago
Make sure you run the engine for a while and NOT at an idle, get it hot, take it around the block, put it under load and shut it off without allowing it to idle. THEN look at the plugs.
Back when I was working on carburetor engines I had an exhaust gas analyzer. They're almost essential when trying to set up the jets. Mine had a long lead that allowed me to connect it to the exhaust and have the monitor sitting beside me on the seat.
You want to find out what the mixture is like when you're running down the road at a constant cruising speed. It's normal to run a little rich during acceleration so don't worry about that. After everything else is adjusted, THEN set up the idle mixture.
Wiki User
∙ 15y ago
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