Mast Motorsports Valve Spring Kit LS 660 Lift Dual Valve Spring Kit - Factory LS Casting Cylinder Head - Integrated Seat Seal
Mast Motorsports Valve Spring Kit LS 660 Lift Dual Valve Spring Kit - Factory LS Casting Cylinder Head - Integrated Seat Seal
Mast Motorsports Valve Spring Kit LS 660 Lift Dual Valve Spring Kit - Factory LS Casting Cylinder Head - Integrated Seat Seal
Mast Motorsports Valve Spring Kit LS 660 Lift Dual Valve Spring Kit - Factory LS Casting Cylinder Head - Integrated Seat Seal
Mast Motorsports Valve Spring Kit LS 660 Lift Dual Valve Spring Kit - Factory LS Casting Cylinder Head - Integrated Seat Seal
Mast Motorsports Valve Spring Kit LS 660 Lift Dual Valve Spring Kit - Factory LS Casting Cylinder Head - Integrated Seat Seal

LS 660 Lift Dual Valve Spring Kit - Factory LS Casting Cylinder Head - Integrated Seat Seal

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Dual Spring Kit for Factory GM Casting Cylinder.

This kit is for a factory casting LS1, LS2, LS3, L92 with an OE style valve guide.  Designed for 0.500 valve guide utilizing the factory 8mm valve and valve locks.

Specs:

  • Rated Valve Lift 0.660 inches
  • Installed Height 1.800 @ 166 lbs
  • Spring Rate: 403#/in
  • Solid Height 1.015
  • Spring OD 1.310"
  • Spring ID 0.680"

Kit includes:

  • Dual Valve Springs
  • Titanium Retainers
  • Integrated Spring Seat with Valve Stem Seal
  • 8mm Valve Locks

Kit Details:

  • Manufactured in the USA
  • Premium Chrome Silicon Vanadium Spring Wire
  • Polished Isotropic Super Finishing & Cryo Treated
  • Titanium 6AL4V Grade 5 titanium retainers
  • Machined & Hardened and Black Oxide Precision Spring Seats

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