Product Description
Set of 3 power piston return springs. Match these from lightest to heaviest to work with your engines vacuum level at idle to improve idle and off idle performance.
In the picture, light is on left, medium in middle and heavy right.
Light (orange) is designed to be down at 7" of vacuum and rise at 5". Recommended for high compression, big cam engines, and factory performance engines.
Medium (blue) set at 9" and rise at 7". Most common spring used, for most stock applications
Heavy spring is rarely used, some very early quadrajets would use these on high vacuum producing engines with power piston with no base apt.
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