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International Automotive Technicians Network
Re: Older School Bus with Holley carb and hi CO
Posted to Emissions Forum on 7/21/2008

454 I doubt.... 366 or 427 maybe???

If it has secondary AIR, get it working. If it's missing, don't expect it to pass on HC.

You can get CO wherever you want it depending on adjustments and jet selection. HC on the other hand..... Check the timing also.

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