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650 Holly double pumper?


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Guest RON JONES

I beleve if its a double pumper,we,re looking at mechanical secondaries.I would prefer it over vacume secondaries.This is a good carb.

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  • 2 weeks later...

I replaced a 600cfm vacuum secondaries with a 650 cfm double pumper. ET dropped an average of three tenths... Find out if someone locally can spin-in some down-leg boosters. If not, I might be able to arrange something. Down-legs are good for 20 free cfm and dramatically improve off-idle transitions.

 

-Andy

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