Five pairs of color coded step up piston springs, allow for fine tuning of primary metering rod engagement. Great aid when tuning for a larger than stock camshaft. Engines that produce less idle vacuum will require a softer spring.
Quanity: 10 springs
Spring Specs:
3"Hg - Blue
4"Hg - Yellow
5"Hg - Orange
7"Hg - Pink
8"Hg - Plain
Fits:
Carter AFB
Carter AVS
Edelbrock Performer Series
Edelbrock Thunder Series