Driving Innovation In Diesel Performance

Performance Engines. Built for Cummins.

Choose 5.9L or 6.7L complete long blocks, built for high-horsepower performance builds.

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Price $29,714.99
PREDATOR Long Block

PREDATOR Long Block

  • Sleeved 4.125" bore wet block foundation
  • FSR billet pistons + X-Beam rod set
  • Fire ring cut head/block + ARP 9/16 studs
  • 275 CFM Stage 3 head + billet intake setup
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From $34,124.99
ENFORCER Deck Plate Long Block

ENFORCER Deck Plate Long Block

  • Deck plate 6.7 block with wet iron sleeves
  • FSR billet pistons + tool steel wrist pins
  • ARP 9/16 head + main studs with HD girdle
  • 300 CFM Stage 3 head + billet intake setup
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From $19,949.99
Performance Series 6.7 Cummins Common Rail Long Block

Performance Series 6.7 Cummins Common Rail Long Block

  • Fully assembled long block through rocker box
  • X-Beam billet rods + OEM Cummins pistons
  • 250 CFM Stage 2 cylinder head package
  • Fire ring cut head/block + HD girdle support
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Price $19,949.99
Performance Series 5.9 Cummins Common Rail Long Block

Performance Series 5.9 Cummins Common Rail Long Block

  • Fully assembled long block through rocker box
  • X-Beam billet rods + OEM Cummins pistons
  • 250 CFM Stage 2 cylinder head package
  • Fire ring cut head/block + HD girdle support
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Price $16,994.99
Street Performance 5.9 Cummins Common Rail Long Block

Street Performance 5.9 Cummins Common Rail Long Block

  • Fully assembled long block with oil pan installed
  • X-Beam stock-length billet connecting rods
  • 200 CFM Stage 1 cylinder head package
  • Fire ring grooves + ARP 9/16 head studs
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From $9,633.99
5.9 COMMON RAIL CUMMINS PRECISION PLUS REMAN LONG BLOCK

5.9 COMMON RAIL CUMMINS PRECISION PLUS REMAN LONG BLOCK

  • Fully assembled long block with oil pan installed
  • Precision Plus reman cylinder head included
  • Optional ARP 625 head studs available
  • Pre-lubed and pressure-checked for install
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Price $16,994.99
Street Performance 6.7 Cummins Common Rail Long Block

Street Performance 6.7 Cummins Common Rail Long Block

  • Fully assembled long block with oil pan installed
  • X-Beam stock-length billet connecting rods
  • 200 CFM Stage 1 cylinder head package
  • Fire ring grooves + ARP 9/16 head studs
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From $9,633.99
6.7 COMMON RAIL CUMMINS PRECISION PLUS REMAN LONG BLOCK

6.7 COMMON RAIL CUMMINS PRECISION PLUS REMAN LONG BLOCK

  • Fully assembled long block with oil pan installed
  • Precision Plus reman head with HD seats
  • Thread-in soft plugs under valve cover
  • Pressure-checked and pre-lubed for install
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Price $12,730.99
Heavy Hauler 6.7 Cummins Common Rail Long Block

Heavy Hauler 6.7 Cummins Common Rail Long Block

  • Fully assembled long block with oil pan installed
  • 200 CFM Stage 1 cylinder head included
  • Street/towing camshaft for airflow under load
  • Pre-lubed with break-in oil + filter included
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Price $12,730.99
Heavy Hauler 5.9 Cummins Common Rail Long Block

Heavy Hauler 5.9 Cummins Common Rail Long Block

  • Fully assembled long block with oil pan installed
  • 200 CFM Stage 1 cylinder head included
  • Street/towing camshaft for airflow under load
  • Pre-lubed with break-in oil + filter included
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Price $11,875.99
19+ 6.7 COMMON RAIL CUMMINS PRECISION PLUS REMAN LONG BLOCK

19+ 6.7 COMMON RAIL CUMMINS PRECISION PLUS REMAN LONG BLOCK

  • Fully assembled long block with key covers installed
  • Reman cylinder head included for clean sealing
  • Updated valvetrain: solid tappets + adjustable rockers
  • Year-specific timing housing / front cover used
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See it in Action

Our Engines are perfect to dominate the competition on the street or the track.

KNOWLEDGE HUB

Everything you need to know about D&J Cummins Performance Engines.

Start with your use-case: Precision Plus for dependable reman replacement, Heavy Hauler for work-truck towing (Stage 1 head + tow cam), Street Performance for big street power (billet rods + fire-ring sealing + Stage 1 head), Performance Series for higher horsepower (Stage 2 head + girdle + fire rings), and ENFORCER/PREDATOR when you’re building a sleeved/fire-ring/competition-level engine.

  • Built for Cummins Long blocks engineered around real-world diesel failure points—sealing, heat, and durability under load.
  • Blueprinted + Balanced Assembly Engines are blueprinted and balanced with measured clearances and file-fit rings for consistent performance.
  • CNC Machining Process CNC boring/honing/deck work and precision checks help deliver clean sealing and repeatable results.
  • Fire-Ring Sealing Options Higher-power series use fire-ring sealing strategies for strong head-to-block sealing under boost.
  • Extreme Builds Available ENFORCER and PREDATOR add sleeved/deck-plate architecture, billet internals, and competition-level hardware.

FAQs

What is a Cummins long block / crate engine?
A long block is the assembled engine foundation (block, rotating assembly, valvetrain/head package depending on series) built to replace or upgrade your existing engine.
Which series should I choose for towing or a work truck?
Heavy Hauler is designed for demanding work trucks and includes a Stage 1 head and tow cam aimed at airflow and EGT control.
Which series is best for big street power?
Street Performance is built for demanding street/performance use with billet rods, fire-ring sealing, and a Stage 1 head package.
What’s the difference between Street Performance and Performance Series?
Performance Series steps up the head package (Stage 2) and bottom-end support (girdle/main studs) for higher horsepower goals.
Do you offer 5.9 Common Rail and 6.7 Common Rail long blocks?
Yes, this collection includes both 5.9L CR and 6.7L CR long blocks across multiple series.
Are the Heavy Hauler long blocks rated for a specific horsepower level?
Heavy Hauler long blocks are listed as rated up to 700 hp depending on application and supporting mods.
Do the Street Performance long blocks have a horsepower rating?
Street Performance long blocks are listed as rated up to 1000 hp depending on application and supporting mods.
Do the Performance Series long blocks have a horsepower rating?
Performance Series long blocks are listed as rated up to 1200 hp depending on application and supporting mods.