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. Comes with new split plastic power piston retainer.
Light 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 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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All QuadraJet Power products are top quality and their service is the best. One thing that would help is to know the Hg rating on each of these springs
Exactly what I needex