D&J Precision Machine Street Performance 6.7 Cummins Long Block

Our Street Performance 6.7 Cummins Long Blocks come fully assembled, including the oil pan, rear crank seal, front cover and crank seal, and oil filter housing. Featuring our X-Beam Stock Length Billet Rods and Stage 1 High-Performance Cylinder Head, this engine is custom-built for your application using the best parts available in the industry, including Cummins, Mahle Clevite, and ARP. This long block is rated for up to 1000 hp, making it perfect for demanding street and performance applications.

Key Features:

Comprehensive Inspection: Disassembled, crack-checked, blasted, and cleaned before machining.
Precision Machining: CNC bored based on application, line bored, surfaced as needed, and torque plate honed to exact specifications.
Fire Ring Grooves: Cut into the cylinder head with custom ARP 9/16" head studs for the best head-to-block seal possible.
High-Performance Cylinder Head: D&J Stage 1 Performance Cylinder Heads are disassembled, crack-checked, fitted with extra-large heavy-duty seats, machined for thread-in soft plugs, and 5-axis CNC ported. Each head undergoes a CNC high-performance valve job and is pressure-checked before assembly and painting.
Blueprinted and Balanced: All engines are blueprinted, balanced, oil clearance measured, and rings file fit.
Pre-lubed and Painted: Engines are painted black and shipped pre-lubed with break-in oil and filter included.
High Power Rating: Rated for up to 1000 hp, suitable for high-performance applications.

Build Includes:

D&J X-Beam Stock Length Billet Rods
New Pistons
12mm ARP main studs
D&J ARP 9/16" Head Studs torqued to 175 ft/lbs
Fire Ring cut into cylinder head
D&J HD 7/16" Pushrods
D&J 200 CFM Stage 1 High-Performance Cylinder Head
D&J tow performance cast cam
New OEM Tappets
New OEM Oil Cooler
New OEM Oil Cooler Housing
New OEM Oil Pump
New Crankshaft Seals
Billet soft plugs (front, rear, and side)
Machined Rocker Box
Machined Rocker Pedestals

High-Performance Cylinder Head Includes:

All new HD bronze valve guides installed
Heavy-duty extra-large intake and exhaust seats installed
Industry-leading 5-axis CNC port job
Thread-in soft plugs under the valve cover
High-performance CNC valve job performed
New OEM valve seals installed
New 103# springs installed

Optional Upgrades:

D&J Billet Timing Cover
Billet valve cover
Billet black valve cover

Shipping and Core Charges:

Core Charge: $3000.00 (Cores can be sent in beforehand to eliminate this charge*)
Shipping: Varies for each purchase.

Cores must include usable block, crank, cylinder head, rocker bases, oil pan and bolts, pickup tube, timing gear housing, timing gear housing cover and bolts, rear seal housing and bolts, piston cooling nozzles, bolts, lower rocker box, and bolts. If there are issues with any of the parts, you will not be charged the full core amount, only the amount needed to replace the bad part. Our core charge is based on re-manufactured parts.

Upgrade to our D&J Precision Machine Street Performance 6.7 Cummins Long Block for unparalleled performance and reliability in your high-powered Cummins engine.

Street Performance 6.7 Cummins Common Rail Long Block