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What Are the Specifications and Common Service Parts for the Discontinued BluePrint Engine BP38313CT1?

If you own, service, or are purchasing a used BluePrint Engines BP38313CT1, you may need specifications or replacement part information for this discontinued engine. While the original product listing is no longer active, archived references identify this engine as a GM Small Block Chevy 383 stroker long block rated at 430 horsepower with aluminum cylinder heads.

What Is the BP38313CT1 Engine?

The BP38313CT1 is a discontinued 383 cubic inch Small Block Chevy stroker sold as a base long block assembly. It was designed as a performance street engine featuring aluminum cylinder heads and a hydraulic roller camshaft. Known specifications include:
  • 383 CID Small Block Chevy
  • 430 Horsepower
  • Aluminum Cylinder Heads
  • Hydraulic Roller Camshaft
  • Base Long Block Configuration 
What Are the Typical Engine Specifications? Based on archived product information and comparable BluePrint 383 engine families from the same generation, the BP38313CT1 commonly included:
  • 4.000" Bore
  • 3.750" Stroke
  • 64cc Combustion Chambers
  • 2.02" Intake Valves
  • 1.60" Exhaust Valves
  • One-Piece Rear Main Seal
  • External Balance Rotating Assembly
  • 91+ Octane Fuel Recommended
Note: Exact camshaft specifications and component part numbers may vary based on original build date and serial number. What Replacement Parts Are Commonly Used? The following service parts are commonly associated with BluePrint 383 small block Chevy engines of this era:

Spark Plugs

  • BluePrint BPP7938
  • NGK BKR5E (NGK 7938)
  • Spark Plug Gap: .035"

Oil Filter

  • BluePrint BPP51061 

Engine Oil

  • BluePrint BPP710 Break-In Oil
  • BluePrint BPP10W30 Service Oil

Harmonic Balancer

Comparable BluePrint 383 engines commonly used:
  • BPP400L Weighted Harmonic Balancer
  • 8" Diameter
  • External Balance Configuration

Flywheel / Flexplate

  • Late-model externally balanced 350/383 flywheel or flexplate

Valve Covers

  • BluePrint BPP9518 Valve Covers
What Timing Settings Should Be Used? Comparable BluePrint 383 hydraulic roller combinations were dyno tested using:
  • Initial Timing: 10°-16° BTDC
  • Total Timing: 32°-34° BTDC at 3,500 RPM
  • Always verify timing requirements for your specific ignition system and fuel quality. What Is the Oil Capacity? Comparable BluePrint 383 engines using the production oil pan were specified at:
  • 5 quarts including filter
Can BluePrint Still Provide Information for a Discontinued Engine? Yes. If available, provide the engine serial number when requesting support. Historical build records, dyno sheets, and component information may still be available for some discontinued BluePrint engine assemblies. 

Is the BP38313CT1 still in production?

No. The BP38313CT1 has been discontinued and is no longer part of the current BluePrint engine lineup.

What horsepower was the BP38313CT1 rated at?

430 horsepower. Archived product references identify the engine as a 430 HP 383 stroker long block.

Was the BP38313CT1 sold as a complete engine?

No. It was sold as a base long block, requiring the customer to supply external components such as induction, ignition, and accessory drive systems. 

What fuel should I use?

Comparable BluePrint 383 aluminum-head hydraulic roller engines were specified for 91+ octane fuel.

What spark plugs are recommended?

BluePrint BPP7938 or NGK BKR5E (7938) gapped to.035".