HOURS 8:00am - 5:00pm | Ohio - Eastern Time    Call: (740) 297-7223
  • Welcome to
    D&J Precision Machine

    Leading Innovation in the Diesel Performance Industry.

  • Welcome to D&J Precision Machine

    Welcome to D&J Precision Machine

    Leading Innovation in the Diesel Performance Industry.

  • FSR Billet Piston

    Our FSR Pistons are setting the standard for long-life extreme performance motors. FRS Pistons are the perfect combination of light weight and extremely durable.

    Shop Cummins
    Shop Powerstroke
    Shop Duramax

  • Billet Valve Cover

    Take your build to the next level with our LED Billet Valve Covers designed to increase crank case ventilation. Our LED Billet Valve Covers include 1hr of custom engraving from simple names and additional can be purchased for complex graphics.

    Shop Billet Valve Cover

  • Billet X-BEAM Rods

    Our Billet X-BEAM Cummins Rods are the strongest connecting rods currently produced for high performance Cummins applications. Pressurized wrist pin lubrication standard made for deckplate and non-deckplate applications.

    More Info

  • FSR Billet Piston

    Our FSR Pistons are setting the standard for long-life extreme performance motors. FRS Pistons are the perfect combination of light weight and extremely durable.

    Shop Cummins
    Shop Powerstroke
    Shop Duramax

  • Billet Valve Cover

    Take your build to the next level with our LED Billet Valve Covers designed to increase crank case ventilation. Our LED Billet Valve Covers include 1hr of custom engraving from simple names and additional can be purchased for complex graphics.

    Shop Billet Valve Cover

  • Billet X-BEAM Rods

    Our Billet X-BEAM Cummins Rods are the strongest connecting rods currently produced for high performance Cummins applications. Pressurized wrist pin lubrication standard made for deckplate and non-deckplate applications.

    More Info

Repairs & Maintenance

Repairs & Maintenance

Our 12,000sq/ft service shop is capable of everything from oil changes to turn key 1200+hp custom builds.

More Info

Custom Engine Builds

Custom Engine Builds

WE DO MORE THAN JUST CUMMINS PARTS! Yes, I know its hard to believe… Are you looking for a competition winning pulling tractor motor?

More Info

Custom Engine Parts

Custom Engine Parts

Have your own product that needs production? We offer custom product design and engineering for specific application.

More Info

Product Branding

Product Branding

Are you a shop looking for your own line of products?

More Info

Repairs & Maintenance

Repairs & Maintenance

5,000sq/ft shop with two post lift. Capable of everything from oil changes to turn key 1000+hp custom builds.

More Info

Custom Engine Builds

Custom Engine Builds

WE DO MORE THAN JUST CUMMINS PARTS! Yes, I know its hard to believe… Need a competition winning pulling tractor motor?

More Info

Custom Engine Parts

Custom Engine Parts

Have your own product that needs production? We offer custom product design and engineering for specific application.

More Info

Product Branding

Product Branding

Are you a shop and want your own line of products?

More Info