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Old 09-11-2003, 06:10 PM
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secondary spring

Hey guys, I've got a chevy BB 396/402 that is essentially stock, accept for a holley 750 vac. secondary carb. My question is what spring should i use for the secondary? or should i just leave it alone until i do more to the engine?

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Old 09-11-2003, 06:13 PM
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If it were me, I'd leave it alone until you find some really good info on tuning Holleys. Ck at your local speed shop for spec books, they'll cover what mods you can try for different engine combos. JMHO! LOL
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Old 09-11-2003, 06:50 PM
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My advise would be to get a 'quick change' secondary cap for your carb. This is a simple swap and will allow you to install any spring you want in seconds. This will allow to to easily fine tune your carb for any application. There is no 'right' spring for every 396 engine. Gear ratios, vehicle weight, trans gearing, converter stall, etc., will all play a role in how light or how heavy of a secondary spring you can run. With a 'quick change' cover you can simply keep changing springs till you find your best set-up. I have provided a link to Holleys website as well as a photo attachment of a pic of mine.

Quick Change kit

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