Re: New member introducing myself and Holley carb
Hello David and Welcome!
The carb you have now is considered the upgrade for the V6.
Here is the link from the 6066 Jolly Page concerning that modification;
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Yours may just need to be jetted down as these do run rich out the box.
The 500cfm is the one most recommended. Mileage is typically around 12mpg(+/-) depending. Do you have dual exhaust? That really helps as well to wake up the engine too.
Let's have more
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1961 GMC Suburban 305A Overdrive
1962 GMC Utility 305D
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