7.3L 1994.5-1997 Powerstroke Long Block Model C Ford Diesel Crate Engine Choate Performance

The “Model C” is a budget-friendly build designed for those looking for an engine close to stock in power but with the common issues fixed.

 

Key Features and Fixes

• Seat Cracking Elimination: Upgraded valves and hardened valve seats used to exceed OEM standards. This eliminates the original design’s tendency for parent material seats to crack under heat cycling.
• Enhanced Valve Integrity: Features all-new, upgraded material valves that eliminate the high-heat separation common in OEM exhaust valves, preventing compression loss and piston-to-valve contact.
• Billet Freeze Plugs: Billet freeze plugs that are securely bolted to the block are used, eliminating the failure-prone factory soft plugs which can corrode or blow out under pressure.

 

Machining Process:

Choate Engineering Performance doesn’t just rebuild engines - we remanufacture them. Each of our engines undergoes extensive, precision machine work to correct OEM flaws and ensure durability and reliability.

Engine Block Machining:

Each of our engine blocks are CNC blueprint machined using state-of-the-art CNC machines. This process ensures perfect dimensions, precise tolerances, and optimal alignment. This starts with decking the surface of the block to achieve the necessary flatness and smoothness (Ra 30 or better) required for flawless sealing with MLS head gaskets. The cylinders are then diamond honed to an extremely tight tolerance to match the piston diameter (within the nearest 0.0001 inch). Following honing, the main bearing bores are line honed to establish a true, straight centerline for the crankshaft. Finally, the cylinder bores are bored to a true 90 degree angle from the crankshaft centerline.

Cylinder Head Machining:

Our cylinder heads are fully machined and enhanced in-house to improve airflow and reliability. Each head is first magnafluxed and pressure tested to ensure they are free of any cracks or leaks. The surface is then precision decked to an extremely smooth finish, guaranteeing the necessary flatness for a perfect seal with MLS head gaskets. Internally, the valve seats are machined to optimize airflow and prevent common failures, and the entire valve train geometry is blueprinted to specific tolerances to reduce lifter preload and prolong component life.

 

Components and Parts:

Engine Core Components

• Cylinder Block
• Crankshaft
• Connecting Rods
• Camshaft
• New Pistons
• Reman Cylinder Heads
• Main Bearings
• Rod Bearings
• Cam Bearings
• Main Bolts
• Head Bolts
• New Lifters
• Billet Freeze Plugs

Gaskets and Seals

• New Head Gaskets
• Rear Main Seal

Cylinder Head Components

• New Valves
• New Valve Guides
• New Valve Seals
• Threaded Blow Proof Plugs