These are oe quality springs made right here in the U.S. and perform as intended unlike the cheapy import copies.
This is a pair secondary opening springs for use on the vacuum secondary Holley 4 barrel carburetors like the 1850 600 and 3310 750 as well as similar brand carburetors.
They are referred to as the white springs. Of the 7 springs these are #1 starting light to heavy. Chart below for reference.
White - lightest
Short yellow - lighter
Long yellow - light
Purple - medium light
Plain - medium
Brown - medium heavy
Black - heavy
Shipped in a box by USPS so they get to you undamaged.
Made in the U.S.A.
Be sure and check our store for more carburetor and fuel systems service parts. We have been providing tech and working with the modular style carburetors since the early 90's.
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