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  • Cleaning Equipment and Supplies
  • Crack Detection & Repair
  • Disassembly & Assembly
  • Cylinder Head Rebuilding
  • Block Rebuilding
  • Connecting Rod, Wrist Pin and Piston
  • Surface Milling and Grinding
  • Crankshaft Reconditioning
  • Flywheel Grinder Equipment & Supplies
  • Diamond Dresser Tips
  • Liquids and Chemicals
  • Gauges and Measuring Instruments
  • Equipment Manuals
  • Machine Repair Parts
  • Used Equipment and Tooling

    • Shop by Brand

  • BEAM
  • Neway
  • Sioux
  • Sunnen
  • Kwik Way
  • Van Norman
  • Berco
  • Storm Vulcan
  • Winona Van Norman
  • JB Manufacturing
  • View all Brands

    • Stones for Model 99 and 100

    Stones for Thor Valve Grinder Model C99 and 100

    • 100 Grit 4" Valve Grinder Stone Green Stone

      100 Grit 4" Valve Grinder Stone Green Stone

      100 Grit Valve Grinder Stone for Grinding Titanium Valves (Green Stone).4" Diameter, 1" overall thickness with a 1/2" offset. 5/8" Hole Diameter Fits all older Sioux & Thor Valve Grinders that use a 4" Stone. Fits Black & Decker and Van Dorn A,...

      $46.20
      Add to Cart
    • 54 grit 4" Valve Grinder Stone

      54 grit 4" Valve Grinder Stone

      54 Grit Stem Grinder Stone.  4" Diameter,  Straight Cup style, 1" overall thickness with 5/8" Hole Diameter  Fits All Sioux / Thor Model Valve Grinders Except 682 and 685L, KO Lee Model K500 and K403COEM Part...

      $32.40
      Add to Cart
    • 80 Grit 4" Valve Grinder Stone

      80 Grit 4" Valve Grinder Stone

      80 Grit Ruby Red General Purpose Valve Grinder Stone.4" Diameter, 1" overall thickness with a 1/2" offset. 5/8" Hole Diameter Fits all older Sioux & Thor Valve Grinders that use a 4" Stone. Fits Black & Decker and Van Dorn A, B, C, LW, M, MW, N,...

      $38.95
      Add to Cart
    • 80 Grit 4" Valve Grinder Stone General Purpose

      80 Grit 4" Valve Grinder Stone General Purpose

      80 Grit General Purpose Valve Grinder Stone.4" Diameter, 1" overall thickness with a 1/2" offset. 5/8" Hole Diameter Fits all older Sioux & Thor Valve Grinders that use a 4" Stone. Fits Black & Decker and Van Dorn A, B, C, LW, M, MW, N, NW, NWA,...

      $36.95
      Add to Cart
    • 90 Grit 4" Valve Grinder Stone

      90 Grit 4" Valve Grinder Stone

      90 Grit General Purpose Valve Grinder Stone.  4" Diameter,  1" overall thickness with a 1/2" offset. 5/8" Hole Diameter  Fits all older Sioux & Thor Valve Grinders that use a 4" Stone. Fits Black & Decker...

      $36.95
      Out of stock
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