GM Ecotec Extra Clearance Spring Seats & Viton Valve Seals – High Lift Upgrade

BK Racing Extra Clearance Spring Seats and high-performance Ecotec Viton valve seals were developed to increase installed height and valve lift capability when paired with BK Racing 83lb valve springs. Factory integrated Ecotec spring seats can limit available lift and installed height, especially in aggressive high-RPM camshaft applications where additional spring travel and retainer clearance become critical.

This upgrade replaces the factory integrated spring seat arrangement with hardened spring steel seats and high-temperature press-on Viton valve stem seals designed to provide additional installed height while maintaining practical drop-in compatibility for many Ecotec cylinder heads. The Viton valve seals are intended to help support a better seal at elevated engine temperatures in performance applications.

The increased installed height reduces seat pressure slightly while significantly increasing available lift clearance and improving valvetrain stability in aggressive racing combinations.

When combined with BK Racing titanium retainers and 83lb valve springs, this package helps support sustained RPM operation commonly seen in circle track, drag racing, turbocharged, and endurance Ecotec applications.

Performance Specifications
(Approximate — always verify installed measurements during assembly)

• Installed Height: 1.365”
• Net Installed Height Increase: Approximately +0.040”
• Seat Pressure: Approximately 71 lb
• Open Pressure: Approximately 218 lb @ 0.500” lift
• Maximum Recommended Lift: 0.567” with BK Racing 83 lb springs and BK high-lift seats and seals; this is not a mechanical or coil-bind limit
• Spring Rate: Approximately 294 lb/in progressive

BK Racing specifies .525-inch recommended maximum valve lift with stock seats and seals, and .567-inch recommended maximum valve lift with BK Racing high-lift spring seats and seals. These figures describe two different assembled configurations. Neither figure is a mechanical travel limit or coil-bind measurement.

Customers must verify the actual installed height, spring pressure, coil-bind clearance, retainer-to-seal and guide clearance, rocker clearance, and piston-to-valve clearance. The first limiting clearance in the assembled engine governs. A lift recommendation alone does not establish compatibility with every camshaft or RPM range.

Kit Includes

• 16 hardened spring steel seat shims
• 16 high-temperature Viton press-on valve seals

Why Additional Installed Height Matters

As valve lift and engine RPM increase, available retainer-to-seal clearance becomes increasingly important for maintaining valvetrain stability and preventing mechanical interference. Additional installed height helps increase available spring travel and lift capacity while reducing excessive spring loading commonly associated with aggressive camshaft combinations.

This allows builders to safely run more aggressive cam profiles while improving overall valvetrain control in high-RPM Ecotec applications.

Ideal Applications

• High-RPM naturally aspirated builds
• Aggressive aftermarket camshafts
• Circle track racing
• Turbocharged Ecotec engines
• Sustained RPM operation
• High-lift racing combinations

These spring seats and valve seals were developed specifically around BK Racing 83lb valve spring combinations and are commonly paired with BK Racing titanium retainers and Solid Lash Adjusters for maximum high-RPM valvetrain stability.

FAQ

What are Viton valve stem seals?

Viton valve stem seals are high-temperature valve seals used in performance engine builds to help maintain sealing at elevated operating temperatures.

What is the best material for valve stem seals?

For high-performance Ecotec applications, Viton is a supported material in this kit because it is designed for elevated heat and demanding valvetrain use.

What are the symptoms of bad valve seals?

Worn valve seals can contribute to oil leakage past the valve stem seal and increased oil consumption through the valvetrain area.