Rochester on 253 let the secondaries open

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Choke Caprice Chevy Oldsmobile 307 Rochester

for Tim - Rochester tips

1971 Buick Gran Sport QJet Carb. no secondaries, how to adjust?
Need to adjust the choke on a Qjet Carb. Choke pull-off replaced but secondaries still don't open. How do I adjust?

High speed idle cam discussion
Here's a look at where and how to adjust the high speed idle cam's adjustment.