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685 Black Label Crate Engine
$ 24,745.00

685 Black Label Crate Engine


Only left in stock

Horsepower: 685 hp
580 tq
Idle Quality: 

Type: LS7 7.0L
Displacement: 427 Cubic Inches
Compression Ratio: 11.4:1
Bore x Stroke: 4.125 x 4.000
Rev Limit: 7250 RPM
Crank: Callies Forged
Rods: Callies H-Beam
Pistons: Mahle 2618 Alloy Pistons
Cam: Mast LS7 427 SS
Heads: Mast LS7 305 Black Label Heads
Intake Valves: Hollow Stainless
Exhaust Valves: Solid Stainless
Intake: MSD LS7 Intake
Valve Springs: Mast Premium Dual Springs

Mast Black LabelArtistic Craftsmanship Holds Hands to an Allegiance of Power

*All hp numbers will be within 2% of the advertised number.  

This LS7 engine family utilizes a Mast Motorsports engineered camshaft that is custom ground on a Mast Motorsports 3 bolt cam core. The 427 Black Label’s foundation is a fully machined GM LS7 aluminum block with a forged Callies rotating assembly with Mahle pistons that is topped off with Mast Motorsports Black Label LS7 305cc cylinder heads and MSD Atomic Airforce LS7 intake manifold. ARP fasteners are used throughout and Mast Motorsports Black Label pushrods ride on GMMP High RPM hydraulic roller lifters.  This hand built LS7 based engine utilizes a camshaft that has a strong lope that creates great mid and high RPM power for the customer that will be aggressively racing their vehicle but still wants to occasionally drive it on the street.

Cars powered by a Mast Motorsports LS7 427 Black Label Engine