Product Summary

350, 395, Long Block Crate Engine Type

  • 34 degrees total timing at 3500 RPM
  • Compression Ratio: 10.4:1
  • Cylinder heads have hardened springs and retainers
  • This 396 cu. in. engine puts out 485 horsepower and 500 ft. lb. of torque
  • Features a new few forged steel crankshaft with new forged pistons and connecting rods

Key Specs

Crate Engine TypeLong Block
Engine Displacement396 cu. in.
Horsepower491 horsepower
Compression Ratio10.4:1
Torque510 ft./lbs

Need To Know

Truck Ship

Truck shipments must be pre-paid with a credit card, certified check or money order

Quick and Easy Returns

Return Policy

BluePrint Engines BP3961CT Details

True Blue Power! BluePrints pro engine builders are enthusiasts just like you and it shows in the quality and performance of every engine they build. Each BluePrint crate engine is carefully dyno tested and ships with printed, proven results. If you’re looking serious horsepower at an affordable price, BluePrint Engines is the choice for you!

GM 396 SBC Base Engine - Aluminum Heads - Roller Cam

  • HP & Torque: 491 HP / 509 FT LBS
  • Compression Ratio: 10.4:1
  • Aluminum Heads
  • Hydraulic Roller Cam
  • Forged Crank
  • Forged Pistons


  • NEW BluePrint Cast Iron Block
  • Manufactured and Machined in the USA!
  • Align honed main bearing bore
  • Cylinders honed on computer controlled machine to within .0002 straightness and roundness
  • Cylinders are sonic tested for thickness
  • 4-Bolt Main
  • 4.000" Bore
  • 1-Piece Rear Main Seal
  • Mech fuel pump provision: Yes
  • Passenger Side Dipstick
  • Drilled and tapped for clutch linkage

Rotating Assembly:

  • New BluePrint Forged Crankshaft
  • 3.875 " Stroke
  • Forged I-beam 6.000" connecting rods
  • Forged Pistons
  • Internal Front/ External Rear

Cylinder Heads:

  • BluePrint Aluminum Cylinder Heads - HP8103
  • 64cc chamber
  • 2.08" intake/1.60" exhaust valves
  • 220cc intake/67cc exhaust runners

Cam Specs:

  • Cam Type: Roller
  • .544 Intake .555 Exhaust
  • 230 Intake / 236 Exhaust duration
  • @ .050, 110 ° lobe separation angle

Ignition Timing:

  • 34 degrees total at 3500 RPM

Also Includes:

  • Valve covers, oil pan and timing cover
  • Dyno test results shipped with engine


  • 30 month / 50,000 mile


  • A bronze distributor gear is NOT recommended on this engine
  • Not for use in pollution controlled vehicles.
  • This engine features a true 4-inch bore, which mathematically yields 389 CID with a 3.875-inch stroke.
  • 93 octane or higher is recommended for this engine.
  • The performance aluminum cylinder heads on this engine feature a .500 raised port vs OEM.


30 month / 50,000 mile

Warranty Information (PDF)

CARB Warning

Follow EPA, CARB, and state regulations for engine changes

Emissions warning: this part is for vehicle engine changes, not direct oem engine replacements. In California, engine changes are legal when done in compliance with California bureau of automotive repairs (bar) engine change policy. For assistance, call bar referee at: (800) 622-7733. And see https://bar.Ca.Gov/consumer/smog_check_program/engine_changes. All customers must comply with federal epa mobile source enforcement memorandum no. 1a (and addendum) and all applicable state regulations when conducting engine changes. Improper installation and/or use of this part in California may subject the installer and/or owner to a $37,500 penalty per violation per vehicle, revocation of registration, loss of use on California public right of ways, and proof of correction for tampering. There are similar restrictions and penalties under federal law and laws of all states for use of this engine change part on makes or models of vehicles that render them noncompliant with applicable state and/or federal emission laws with penalties under federal law of up to approximately $45,268 per tampered vehicle and/or engine

BluePrint Engines BP3961CT Specifications

MFG. Part #BP3961CT
BrandBluePrint Engines
Crate Engine TypeLong Block
Engine Displacement396 cu. in.
Horsepower491 horsepower
Compression Ratio10.4:1
Torque510 ft./lbs
Camshaft TypeHydraulic Roller
Cylinder Head MaterialAluminum
Piston MaterialForged Aluminum
Crankshaft MaterialForged 4340 Steel
Camshaft Duration (.050 in)230° intake / 236° exhaust
Camshaft Lift (in).544 intake / .555 exhaust
Bore x Stroke (in)4.000" bored .040" over x 3.875"
Intake Manifold IncludedNo
Distributor IncludedNo
Connecting Rod MaterialForged Steel
Valve Covers IncludedYes
Cylinder Heads IncludedYes
Rear Main Seal Style1-piece
Oil Pan IncludedYes
Timing Cover IncludedYes
Water Pump IncludedNo
Harmonic Balancer IncludedNo
Flexplate IncludedNo
Flywheel IncludedNo
Air Cleaner IncludedNo
Spark Plugs IncludedNo
Spark Plug Wires IncludedNo
Warranty30 month / 50,000 miles
Camshaft IncludedYes
BlockHand picked, seasoned, square and parallel decked, 4 bolt main
NotesRecommended oil for your BluePrint Crate Engine: 10W30, Non-Synthetic, Not for EGR