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PAC 604 Crate Oval Track Racing Springs
The world's premier valve spring manufacturer. NASCAR, drag racing, F1, rally, and sprint cars to every day street performance engines use PAC Racing products to provide unsurpassed performance in all forms of motorsports. Innovative designs produced by skilled spring makers from the highest quality materials ensure the highest performing valve springs available. Sets of 16.
GM 604 Crate Motor "Blue Beehive" Spring - meets the nominal class specs but has variable rate features that allow more RPM capability. It has a rate of 386.
Diameter: 1.077/1.282
Seat Pressure: 92 @ 1.800
Open Pressure: 285 @ 1.300
Coil Bind: 1.181
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