Ok, i found a spring kit i bought a while back for a holley carb i had. these springs are for the vacuum secondaries. Part # is 20-13. I used 1, a brown i believe(heavier for a truck or whatever) but there are still 7 other springs that are brand new. I'm just asking $3 and thats mainly to cover the shipping. 7th spring is sort yellow not shown.
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Originally Posted by Holley Website
SECONDARY THROTTLE OPENING RANGES
COLOR RELATIVE LOAD 350 CID ENGINE OPENING RPM 402 CID ENGINE OPENING RPM
.......................Initial.... Full.......... Initial......... Full
White Lightest --- --- --- ---
Yellow* Lighter ..1620.......5680.......... 1410......... 4960
Yellow Light.......1635.......5750........... 1420........ 5020
Purple Med. Light 1915......6950........... 1680........ 6050
Plain Medium...... 2240......8160........... 1960........ 7130
Brown Med. Heavy 2710....8750........... 2380........ 7650
Black Heavy .......2720.Not Fully Open...2390........ Not Fully Open
*Short Spring
NOTE: All data was taken without the air cleaner. An air cleaner would cause an earlier opening in all cases. Values are subject to change due to cleaner restrictions.
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