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✓Each kit includes Skunk2's high-quality race-proven dual valve springs that are the result of nearly two decades of racing and engine building experience
✓Each Pro Series XP racing valve spring is manufactured exclusively from super-clean, chrome-silicone wire milled in Japan
✓This spring has a seat pressure of 100 pounds at 1.6 inch while keeping the coil bind height for higher lift camshafts
✓Pro Series XP racing valve springs have been tested at speeds exceeding 11,000 revolutions per minute on engine dyno, street, and the race track; Japanese-milled, super-clean chrome silicone wire is 100 percent eddy-current inspected prior to coiling
✓The end result is a lightweight valve spring that safely accommodates high-lift camshafts and features superior resistance to load loss, even under extreme operating conditions