What Are the Specifications for the Discontinued BluePrint Engines BPC4081CTC Chrysler 408 Stroker Engine?

 What Engine Is This?

 Engine Family: Chrysler LA Small Block Displacement: 408 Cubic Inches Base Block: Chrysler 360 (1975-1989) Configuration: Stroker Balance Style: External balance front and rear Fuel System: Carbureted Camshaft Type: Hydraulic flat tappet Cylinder Heads: Aluminum performance heads What Rotating Assembly Was Used? The engine was assembled with:

• Forged pistons
• H-beam connecting rods
• Forged steel stroker crankshaft
• External balance configuration

The rotating assembly was designed for high-performance street and street/strip use. What Cylinder Heads and Valvetrain Were Used?

Cylinder Heads

• Aluminum performance cylinder heads
• 2.02"/1.60" valve configuration (Edelbrock Performer RPM style)

Valvetrain

• Hydraulic flat tappet camshaft
• Shaft-mounted rocker arm system
• Hardened pushrods
• Hydraulic lifters

Cam Installation Specification

Camshaft must be degreed to 106° intake centerline. What Intake and Ignition System Were Used?

Intake Manifold

• High-rise dual-plane aluminum intake manifold
• Air-gap style design

Ignition System

• MSD distributor
• MSD ignition coil
• Conventional spark plug wire setup

What Carburetor Was Used? The engine was equipped with a performance 4-barrel carburetor in the approximately 750 CFM range depending on production period and calibration. What Compression Can Be Expected? Typical cranking compression: 190-210 PSI Actual readings vary based on:

• Altitude
• Gauge accuracy
• Engine temperature
• Camshaft timing
• Ring seal condition

What Oil Pressure Should the Engine Have? Normal oil pressure: 40-60 PSI Pressure should be checked with the engine at operating temperature using a known-good mechanical gauge when diagnosing concerns. What Bore and Deck Specifications Were Used?

Cylinder Bore

• Standard bore reference: 4.001"
• Production build utilized a .040" overbore

Deck Height

• Finished deck height: 8.327"

Piston Position

• Pistons should be approximately 0" to .005" below deck surface.

What Clearances Were Used During Assembly?

Main Bearing Clearance

• .0015" to .0030"

Connecting Rod Bearing Clearance

• .0015" to .0025"

Piston-to-Wall Clearance

• Approximately .0015"

What Torque Specifications Were Used?

Main Caps

• 85 ft-lbs with moly lubricant

Connecting Rods

• 63 ft-lbs with moly lubricant

Rocker Arms

• 25 ft-lbs

Cylinder Heads

Three-step torque sequence:

1. 45 ft-lbs
2. 65 ft-lbs
3. 95 ft-lbs final torque