D&J Precision Machine Performance Series 6.7 Cummins Long Block

Our Performance Series 6.7 Cummins Long Blocks come fully assembled from the oil pan to the rocker box with our X-Beam Stock Length Billet Rods and our Stage 2 High-Performance Cylinder Head. We custom-build this engine 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 1200 hp, making it perfect for high-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, CNC machined for the girdle and studs, and torque plate honed to exact specifications.
• Fire Ring Grooves: Cut into the cylinder head and block with custom ARP 9/16" head studs for the best head-to-block seal possible.
• High-Performance Cylinder Head: D&J Stage 2 Performance Cylinder Heads are disassembled, crack-checked, fitted with extra-large heavy-duty seats, machined for our Stage 2 Billet Intake Manifold, and 5-axis CNC ported. All cylinder heads are hand-lapped and pressure-checked before complete assembly.
• Blueprinted and Balanced: All engines are blueprinted, balanced, oil clearance measured, and rings file fit.
• Pre-lubed and Painted: Engines can be painted any color and are shipped pre-lubed with break-in oil and filter included.
• Machined Rocker Box and Pedestals: Ensures a precise fit and optimal performance.
• High Power Rating: Rated for up to 1200 hp, suitable for high-performance applications.

Build Includes:

• D&J X-Beam Stock Length Billet Rods
• OEM Cummins Pistons
• D&J HD Girdle and ARP 9/16" Main Studs
• D&J ARP 9/16" Head Studs torqued to 175 ft/lbs
• Fire Ring cut into cylinder head and block
• D&J HD 7/16" Pushrods
• D&J 250 CFM Stage 2 High-Performance Cylinder Head
• 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, side, and rear)
• Machined rocker box
• Machined rocker pedestals

250 CFM Stage 2 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
• Billet replacement style intake
• Thread-in soft plugs under the valve cover
• High-performance CNC valve job performed
• New OEM valve seals installed
• New 115# springs installed
• New titanium retainers installed

Optional Upgrades:

• D&J Billet valve cover (raw finish)
• D&J Billet Timing Cover
• D&J Billet valve cover (black)

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, rockers, oil pan and bolts, pickup tube, timing gear housing, timing gear housing cover and bolts, rear seal housing and bolts, piston cooling nozzles, and bolts, lower rocker box, and bolts. Valve covers and bell housings are preferred so the engine stays sealed in shipping. 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 Performance Series 6.7 Cummins Long Block for unparalleled performance and reliability in your high-powered Cummins engine.