BluePrint Builder Series LS427/625HP Standard Edition EFI Crate Engine and T56 Transmission Combos BLS427KBT56

This LS427 combo runs a black front accessory drive instead of polished, bolting the same 625-horsepower engine to a 6-speed T56 manual for a builder who wants the darker finish. Torque is 565 lb-ft at an 11.0:1 compression ratio, with forged pistons and a forged crankshaft doing the work.

Who this suits

Pick this over the automatic LS427 package if you want six forward gears and full manual control, while still getting the engine's own LS-based electronics pre-wired. The package ships with its ECU left unlocked for local dyno refinement, an LT4-style drive-by-wire throttle body, and fuel arrives through 42-pound injectors and a return-less rail beneath an LS3 production intake manifold.

What to check before ordering

This 427 swap targets the LS-based 7.0L/427 engines Chevrolet installed from 2006 to 2015 — confirm your donor engine or chassis matches before buying. The clutch is a McLeod Super Street Pro twin-disc unit. A steel bellhousing and non-weighted billet flywheel round out the T56 package, topping out in a 0.63:1 overdrive sixth gear. The oil pan retrofits into most rear-wheel-drive GM V8 chassis built from 1955-95, and this is not meant for dry-sump setups or vehicles that need emissions controls. Fuel should be 91-93 octane; BluePrint spec's its BPP710 oil for service.

Common questions

Why is the accessory drive black instead of polished? BluePrint sells this T56 combo in both finishes under different part numbers, and this one is the black version.

Does it include a flywheel? Yes, a non-weighted billet flywheel sized to the T56 clutch.

Does the ECU need tuning before it runs? It ships unlocked, so a local dyno shop can refine the calibration if you want.