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Re: Re: '78 Chevy K-10 blues (Roch. Carb)Posted by Bob on December 21, 2004 at 12:35:48 from (66.163.134.177): In Reply to: Re: '78 Chevy K-10 blues (Roch. Carb) posted by Bob M on December 21, 2004 at 05:52:17: Carburetor icing, or a cold intake manifold will make this worse, too. Is your heat riser present, and operating properly? In addition, the heat riser directs exhaust up through a cross-over in the intake manifold for mixture pre-heat, and also warms the choke thermostat. If the heat riser isn't closing, or the manifold pre-heat passage is carboned up, there won't be manifold pre-heat, PLUS the choke will stay on way too long. Is the pre-heat tube from the exhaust manifold to the air cleaner snout present? Do you have a functioning thermostat, and possibly cover part of the radiator to aid warmup? Like Bob M says, the choke setting on these is critical, and it's almost impossible to get them set where they will work in all seasonal temperatures.
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