Driving Innovation In Diesel Performance

Street Performance Long Blocks. Built for Cummins.

For 5.9L & 6.7L Common Rail. Fully assembled with X-Beam billet rods, a 200 CFM Stage 1 head, and fire-ring sealing.

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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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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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KNOWLEDGE HUB

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

Street Performance is built for demanding street and performance use: CNC machined, blueprinted & balanced, and assembled with sealing and airflow upgrades like ARP 9/16 head studs, fire-ring grooves, and a Stage 1 cylinder head package (5-axis porting + thread-in soft plugs).

  • Rated for serious street power Built and listed as rated up to 1000 hp with the right supporting mods.
  • X-Beam billet rods included Uses D&J X-Beam stock-length billet rods for strength where it matters.
  • Stage 1 head package 200 CFM Stage 1 head with durability upgrades and performance port work.
  • Fire-ring sealing + ARP studs Fire-ring grooves with ARP 9/16 head studs for a stronger head-to-block seal.
  • Ready-to-install long block build Fully assembled and shipped pre-lubed with break-in oil + filter.

FAQs

What is the Street Performance Cummins long block?
A fully assembled 5.9/6.7 CR long block with X-Beam billet rods, a Stage 1 head, and fire-ring sealing for demanding street use.
Which engines does this series fit?
Street Performance 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 1000 hp (supporting mods and tuning still matter).
What cylinder head comes on Street Performance?
A D&J 200 CFM Stage 1 high-performance cylinder head package is included.
Does it include billet connecting rods?
Yes, both engines list D&J X-Beam stock-length billet rods in the build.
What does “fire-ring sealing” mean here?
Fire-ring grooves are cut into the cylinder head and paired with ARP 9/16 head studs for a stronger seal.
Do these ship pre-lubed?
Yes, both are listed as painted black and shipped pre-lubed with break-in oil and filter included.
Is there a core charge? Can I send my core first?
Yes, both pages list a $3,000 core charge and note cores can be sent in beforehand to eliminate it.