Driving Innovation In Diesel Performance

Performance Series Long Blocks. Built for Cummins.

Fully assembled with X-Beam billet rods, a 250 CFM Stage 2 head, and fire-ring sealing. Rated up to 1200 hp.

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From $21,346.99
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 $20,348.99
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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KNOWLEDGE HUB

Everything you need to know about D&J Cummins performance engines.

Performance Series is the step up from Street Performance: Stage 2 airflow + billet intake, fire-ring grooves, and bottom-end support (HD girdle + main studs) for higher horsepower goals, while still shipping as a fully assembled long block from oil pan to rocker box.

  • Rated for 1200 hp Listed as rated up to 1200 hp with the right supporting mods.
  • 250 CFM Stage 2 head package Stage 2 head includes 5-axis porting, billet replacement intake, thread-in soft plugs, and 115# springs/titanium retainers.
  • Fire-ring sealing + ARP 9/16 studs Fire-ring grooves cut into head and block with custom ARP 9/16" head studs for max sealing.
  • Bottom-end support built in HD girdle + ARP 9/16" main studs paired with X-Beam billet rods for higher-load durability.
  • Fully assembled + pre-lubed Ships assembled and pre-lubed with break-in oil + filter to support a confident first start.

FAQs

What is the Performance Series Cummins long block?
A fully assembled 5.9/6.7 CR long block with X-Beam billet rods, a 250 CFM Stage 2 head, fire-ring sealing, and HD bottom-end support.
Which engines does this series fit?
Performance Series long blocks are offered for 5.9L Common Rail and 6.7L Common Rail applications.
What is the horsepower rating?
These long blocks are listed as rated up to 1200 hp (supporting mods and tuning still matter).
What cylinder head comes on Performance Series?
A 250 CFM Stage 2 high-performance cylinder head package is included.
Does the Stage 2 head include a billet intake?
Yes the Stage 2 head package lists a billet replacement style intake as included.
What does “fire-ring sealing” mean here?
Fire-ring grooves are cut into the cylinder head and block and paired with ARP 9/16 head studs for a stronger seal.
Do these ship pre-lubed with break-in oil?
Yes, listed as shipped pre-lubed with break-in oil and filter included.
Is there a core charge? Can I send my core first?
Yes, both list a $3,000 core charge, and cores can be sent in beforehand to eliminate it (core parts list applies).