Skunk2 Pro XP Valve Spring Set – B-Series VTEC | 311-05-7350

The Skunk2 Pro XP Valve Spring Set is designed for the extreme demands of high-RPM, turbocharged, and high-lift camshaft applications in Honda B-Series VTEC engines. With a seat pressure of 93 lbs @ 1.320", these dual valve springs offer enhanced control and durability beyond 11,000 RPM, making them ideal for championship-level racing.

Manufactured from super-clean, Japanese-milled chrome-silicone wire and wound by a premier North American spring winder, each spring undergoes a stringent quality process including heat treatment, shot peening, chemical polishing, and nitriding for superior fatigue strength and resistance to load loss. The dual-spring design, featuring inner and outer springs with different frequencies, ensures maximum stability and prevents valve float under extreme conditions.

Backed by over two decades of racing experience and in-house testing, Skunk2’s Pro XP springs represent the pinnacle of valvetrain performance for the Honda B-Series.

Key Features:

• Designed for turbocharged and extreme high-RPM B-Series engines

• High seat pressure: 93 lbs @ 1.320" for maximum stability

• Dual spring configuration with interference fit for superior damping

• Withstands engine speeds exceeding 11,000 RPM

• Compatible with high-lift camshafts

• Made from Japanese chrome-silicone wire

• Heat-treated, shot-peened, chemically polished, and nitrided for durability

• 100% eddy-current inspected for quality assurance

• In-house engineered and race-tested by Skunk2

Technical Specifications:

• Seat Pressure: 93 lbs @ 1.320"

• Open Pressure: 238 lbs @ 0.820"

• Coil Bind Height: 0.718"

Note: Use Skunk2 Spring Bases (P/N 312-05-0015) when installing in H22A or F20B engines.

Vehicle Fitment:

• Honda B16A/B

• Honda B17A

• Honda B18C

What's Included:

• (1) Complete Set of Pro XP Dual Valve Springs