....Hello Everyone! I have a 413 small block Chev motor in my '32 with a Holley 750 Double Pumper {mechanical secondaries}. This carb was gone through by a professional carburator shop & was supposidly set up for my application {413, 10 to 1 comp, 230/236 @ .05 cam, RPM air gap manafold, 1 5/8" headers, 2800 stall converter. They asked & the place that built the motor gave them some spec's on timing, etc.} Anyway, when I punch it it just bogs & goes nowhere for 2 seconds or so. Then it takes off like a rocket .... But WHY the 'bog'??? This carb used to do this before it was re-done by the carb shop {years ago on this motor w/ a different cam}. I told the carb shop about this but now it does it worse! On dyno day when my engine was dyno'd the last thing we did was increase the jet size from 70/82 to 71/83. It put out like 1 more HP & I said just leave it like that. The guy running the dyno said these juts might be to big. Could this be causing my problem??? THANKS Everyone, Bill