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Engine: $1125.00

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This Long Block covers Marine Engine Serial Numbers(ESN) M7G - C7X - C7B & others.

This is for Engines produced from 2004 to 2007 with the HEUI Fuel System.  Call to check on the availability of  Engines produced from 2007 to 2009 with the Common Rail Fuel System.

You will receive the long block, as pictured, along with the new oil pump & the long block gasket set.  You will need to follow the installation instructions found under the documentation tab on our home page.  A copy of the installation instructions (along with various other documents for your review) will be included with the long block shipment. 


Our Remanufactured C-7 Caterpillar® Long Blocks are assembled using Interstate McBee, Mahle, PAI, Caterpillar®, and IPD Diesel Parts.  New Steel Crown Piston Kits, Rod Bearings, Main Bearings, Cam Bearings, Pin Bushings, Long Block Gasket Set, Oil Pump, and several Valve Train Components are replaced.

The Steel Crown Piston is a 2 piece Piston used in some of the C7 Arrangement Numbers.  The Piston is only available in a standard bore size.  This results in the mandatory use of a ductile iron liner.


We do not spray weld cylinder walls back to standard bore.  Some remanufacturers and OEM have moved to this type of repair process, we have not.  We machine the block in 4 axis CNC machines to convert the block to a dry liner style of engine, similar to a Kubota or an Isuzu block.  We install custom made ductile iron liners that we have manufactured in the USA!


There are numerous C-7 Cat® configurations for various applications.  Your Engine Serial Number(ESN) & Arrangement Number are required to make sure we deliver the proper engine for your unique application.


   WARNING: Crude oil, gasoline, diesel fuel, and other petroleum products can expose you to chemicals including toluene and benzene, which are known to the State of California to cause cancer and birth defects or other reproductive harm.

For more information go to

Long Block & Rotating Assembly

Cylinder Head


Oil Pump

Front Geartrain Housing

Gasket Set

 Gasket Set to Include the Following:

Front & Rear Crank Seals & Wear Sleeves - Oil Pan - Intake - Exhaust - Water Pump - Thermostat - Front Cover - Valve Cover - Oil Cooler Gaskets.  Also includes various O-Rings for the Oil, Coolant & Fuel System.


All engines are blueprinted.  Blueprinting is defined as removing or narrowing the tolerances found in mass production engines.  The rod, main, & cam clearances are measured with a dial bore gauges & micrometers.  Bearings clearances are set depending upon the application (truck, marine, machine, etc.).  Piston & valve guide clearances are set with dial bore gauges.  Cam timing events are measured and adjusted.  Valve recession & piston protrusion measurements are taken, this is critical in a diesel engine.  

We do not weld or repair cracked blocks or heads.  We do not weld damaged crankshaft journals.

We do not spray weld any components in the machining process.  Some remanufacturers have turned to spray welding cylinder walls back to standard bore.  We do not spray weld cylinder walls.  If the block must be standard bore due to piston availability, then we convert the block to a dry liner style of block, similar to a Kubota or Isuzu block.  We use a ductile iron upper flange liner that we have custom made in the USA.

Cylinders are machined in Milltronics & RMC CNC Machining centers & honed in Sunnen CNC cylinder hones with diamond abrasives (OEM technology).

Main bearing saddles are align honed or align bored.  This is part of the blueprint process.  We do not try and repair blocks with "spun" main bearings.

Block decks are resurfaced with CBN inserts in Milltronics & RMC CNC Machining centers.  This is the latest technology in surfacing cast iron.  We machine the block deck to the recommended RA finish and we use a profilometer (a device used to check surface finish) to check the surface finish after machining.  We do not use head gasket "shims" to correct block deck height errors.

Crankshafts are heat treated in thermal convection ovens, which is better and easier on the casting than the standard thermal oven, shot peened to relieve casting stresses, and machined a maximum of .010 on rod & main journals.  Our crankshafts are then balanced in Stewart Warner digital balancers.  No welded crankshaft journals! No rear seal "speedie" sleeves, which will leak over time!  

Connecting rods are also heat treated, shot peened and machined to OEM specifications.  We machine the pin bushing in CNC machining centers to equal center to center lengths.  This is part of the blueprinting process.  Matched & balanced sets of rods. We do not try to recondition rods with "spun" bearings.

Cylinder heads are remanufactured to exceed OEM specifications in Rottler or Serdi valve seat machines.  Valve guides are replaced & honed in Sunnen guide hones.  Head gasket surfaces are refinished with CBN inserts, the latest technology in the resurfacing of cast iron.  Surfaces are then checked with the same profilometer used on block gasket surfaces.

We do not weld or repair cracked or damaged cylinder head castings.  We do not "shim" weak valve springs to increase pressure, they are replaced.  We do not use bronze valve guide liners, as they will commonly fail.  We replace the valve guide we do not try to repair it.

All assembled long blocks are tested for compression before shipping.  Our engine builders are ASE master engine machinist.