| PAC racing springs introduces the highest level of valve spring available for LS1/2/3/7 heads without requiring additional machine work. Nitrided 1521 dual LS1 springs are high end street / strip spring for applications up to 0.700 lift. Similar to the PAC-1221/ Comp Cams 921 however PAC 1521 includes nitriding and Nano Peen Spring processing for long life.
PAC 1521 springs are interchangeable with Comp Cams 921 springs, allowing them to be used as replacement for them.
Spring specs 160 lbs @ 1.800"
- 425 lbs @ 1.150"
- Coil bind 1.080"
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