This is a BluePrint Engines 427 cubic inch GM LS Pro Series crate engine, supplied as base dressed without an ECU or wiring harness, 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. 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
- Configuration: Base dressed, no ECU or harness
- Balance: Internally balanced front and rear
- Fuel: 91+ octane
- Part number: PSLS42730CT
What's Included: Base dressed engine with BluePrint LS3-style aluminum heads and a hydraulic roller cam, plus a harmonic balancer, valve covers, an LS-swap oil pan, and a timing cover. It does not include a fuel injection ECU, wiring harness, or intake, which the buyer supplies. A non-weighted flex plate or flywheel is required, and a stall converter of 2200 RPM or higher is recommended.
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.
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
What is included with the PSLS42730CT?
It is a base dressed 427 with BluePrint LS3-style aluminum heads and a hydraulic roller cam, plus a harmonic balancer, valve covers, an LS-swap oil pan, and a timing cover. It does not include a fuel injection ECU, wiring harness, or intake.
How much power does the 427 LS make?
It is rated at 605 horsepower and 565 lb-ft of torque, and ships with a dyno printout of its tested results.
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 flex plate or flywheel is required for this internally balanced LS engine, and a stall converter of 2200 RPM or higher is recommended.
Is it street legal?
BluePrint states this Pro Series engine is not for use on pollution-controlled vehicles. Confirm your local requirements before purchase.
