This is a BluePrint Engines 427 cubic inch GM LS Pro Series crate engine, base dressed with a Holley Terminator X Max EFI system, rated at 605 horsepower and 565 lb-ft of torque. It is built on a high-strength LSX-style cast iron block with a forged rotating assembly and LS3-style aluminum heads, and arrives with the GM plastic intake, throttle body, fuel injectors, and the Terminator X ECU and harness. Every BluePrint crate engine is dyno tested and ships with a dyno printout.
Specifications:
- Displacement: 427 c.i.
- Horsepower: 605 HP
- Torque: 565 lb-ft
- Bore: 4.0685 in
- Stroke: 4.125 in
- Compression ratio: 11:1
- Block: High-strength cast iron LSX-style, 6-bolt main, priority main oiling, uses OEM LS3 front and rear covers, 1-piece rear main seal
- Crankshaft: Forged, 4.125 in stroke
- Connecting rods: Forged 6.125 in
- Pistons: Forged, dish, 22cc
- Cylinder heads: BluePrint LS3-style aluminum PS8015, 69cc chamber, 2.165 in intake / 1.590 in exhaust valves, 259cc intake runners
- Camshaft: Hydraulic roller, 3-bolt, .624 in intake / .624 in exhaust lift, 239/255 duration at .050, 114 deg LSA
- Induction: GM plastic intake, drive-by-wire throttle body, EV6-type injectors (42 lb at 58 psi), Holley Terminator X Max EFI with pre-loaded calibration
- Balance: Internally balanced
- Fuel: 91+ octane
- Part number: PSLS4273CTF
What's Included: Base dressed EFI engine with the Holley Terminator X Max ECU and harness (pre-loaded with a BluePrint calibration), GM plastic intake manifold, drive-by-wire throttle body, fuel injectors and fuel rail, throttle pedal and sensors, coil packs, spark plugs and wires, harmonic balancer, water pump, and an LS-swap oil pan with windage tray and pickup. A non-weighted flex plate or flywheel is required.
Engine Platform: Built to the GM LS platform, Pro Series. The included LS-swap oil pan fits most 1955 to 1995 GM front-engine rear-wheel-drive V8 chassis. Do not run the Holley setup wizard, which erases the BluePrint calibration.
Compliance: Not for use on pollution-controlled vehicles, and not for dry-sump applications.
Prop 65 Warning: This product can expose you to chemicals known to the State of California to cause cancer and reproductive harm. For more information visit www.P65Warnings.ca.gov.
FAQ
Does the 427 LS come with EFI?
Yes. It is base dressed with a Holley Terminator X Max EFI system, including the ECU and harness pre-loaded with a BluePrint calibration, GM plastic intake, throttle body, injectors, and fuel rail.
How much power does it make?
It is rated at 605 horsepower and 565 lb-ft of torque, and ships with a dyno printout.
What chassis does the oil pan fit?
The included LS-swap oil pan fits most 1955 to 1995 GM front-engine rear-wheel-drive V8 cars. It is not for dry-sump setups.
Do I need a special flywheel or flex plate?
Yes. A non-weighted (balancer-less) flex plate or flywheel is required for this internally balanced LS engine.
Is it street legal?
BluePrint states this Pro Series engine is not for use on pollution-controlled vehicles. Confirm your local requirements before purchase.
