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97.5+ 5.9L/6.7L Cummins HMR 12MM Extra Long Main Studs

Limited Availability!

These studs are designed for use with any encore (1997.5) or newer "b" series Cummins engine block when using a modified girdle.
These longer studs allow you to connect your girdle to the main caps for added strength to the block.
Kit includes

  • Studs, 14 ea
    • 12mm, main studs
    • L-19, 240 ksi min
    • Glass bead finish
    • Hex broach
  • Nuts, 14 ea
    • 12pt
    • Black oxide finish
    • Double wall thickness, 5/8" wrenching
  • Washers, 14 ea
    • Alloy
    • No chamfer
    • Black oxide finish
  • Instructions
  • Manufactured for Haisley machine by ARP

As horsepower has risen in the common rail engines, we have found it necessary to offer the 12mm main stud in an extra long version to make it possible to tie the main caps to the block.

HMR part number: HMR 1054005/12MM/XL

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