700hp....Pump Gas....Reliable. Don't settle for less! Our Chupacabra Off Road Racing Engine features Mast Black Label LS7 305 heads, the leader when it comes to all out performance.
We know you spared no expense on the other components of your rig so we spare no expense on the components of our engines.
Horsepower: 700 hp
Torque: 580 tq
Idle Quality: Rough/Choppy
Type: LS7 7.0L
Displacement: 427 Cubic Inches
Compression Ratio: 11.5:1
Bore x Stroke: 4.130 x 4.000
Rev Limit: 7250 RPM
Crank: Callies Forged
Rods: Callies H-Beam
Pistons: Mahle 2618 Alloy
Cam: Mast LS7 427 SS
Heads: Mast Black Label LS7 305 Heads with Mast Premium dual spring kit.
Intake Valves: Hollow Stainless
Exhaust Valves: Solid Stainless
Intake: MSD Atomic Airforce Intake
Valve Springs: Mast Dual
ARP Main Stud Kit
Mast Motorsports LS7 427 SS Cam ground on a premium Billet core
Mast Motorsports Chromemoly .080" wall 3/8" Hardened Pushrods
ARP 12-Point Head Stud Kit
Cometic MLS Cylinder Head Gaskets
GM LS7 Rocker Arms with CHE Premium Trunnion Upgrade Kit
Mast Black Label Valve Covers with Ignition Coils
Melling High-Pressure Oil Pump
Rollmaster Billet Timing Set with IWIS Chain
Johnson Short Travel Link Bar Hydra Roller Lifters
Mast LS Oil Pan
Complete GM Sensors
Mast Premium Spark Plug Wire Kit
NGK Spark Plugs
The engine is dyno tested with break-in complete, ready to run when you get it!
AC Delco Oil Filter
*All hp numbers will be within 2% of the advertised number.
The Chupacabra Off Road Racing Engine has a Mast Motorsports engineered camshaft that is custom ground on a Mast Motorsports 3 bolt premium billet cam core. This 700 horsepower Off Road Racing Engine's foundation is a honed and decked LS7 aluminum block with a 4.000” forged Callies rotating assembly with Mahle Motorsports 2618 Alloy pistons that is topped off with Mast Black Label LS7 305 heads and a MSD Atomic Air Force LS7 intake manifold. ARP fasteners are used throughout and Mast hardened pushrods ride on Johnson Slow Leak Down hydraulic roller lifters. The Chupacabra Off Road Racing Engine is the mid-level offering in our line of Mast Motorsports Off Road Racing engines that are designed for the Ultra 4, Rock Bouncer, Mud Truck markets. This Off Road Racing 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.