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Cocke County, TN. 55 Bel Air Sport Coupe
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Discussion Starter · #1 ·
Been tweaking the Quadrajet and I'm up to 12mpg for a 454 only going WOT a few times during the 90 mile test trip. Still have some of the smallest metering rods in the secondaries so when it's floored it still goes when I want it to.

Question, how do I measure the size of the primary jets? The stamping on them is not legible. I tried using drill bits and they are between 1/16" and 5/64" or .0625 and .078. The jets available run from .065 to .079. Any reference to what would have been installed factory for a model 17058212 carb? Is there a chart somewhere that shows what rods work with what jets?
 
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