Texas Speed & Performance TSP-427RESL-CLEETUS-SB Short Block

Step into the performance world with the TSP-427RESL-CLEETUS-SB, the same 427 CID re-sleeved Gen 4 short block that powers Cleetus McFarland's legendary "Leroy" C5 Corvette. This beast was the first GM six-speed manual vehicle to break into the 7-second quarter-mile club, clocking in at an impressive 7.82 seconds at 176 MPH. Designed for high boost applications, this short block is engineered to deliver serious horsepower while embodying the spirit of American muscle.

Dubbed "Leroy 1.0," this engine is built to handle the rigors of a twin-turbo setup, supporting over 1,000 RWHP without breaking a sweat. If you're aiming for that kind of power, consider upgrading to 1/2" head studs for added reliability. Our team is here to assist you in determining the ideal compression ratio for your specific setup, ensuring you get the most out of your engine build. Plus, we stock all the necessary GM and aftermarket bolts and gaskets to complete your project.

LS2 Conversion Package

If you're planning to install this powerhouse into a vehicle originally equipped with a Gen 3 engine, you'll need the LS2 conversion package. This package includes:

• LS2 valley cover
• Set of 4 LS2 lifter trays
• Cam sensor extension harness
• Knock sensor extension harness
• LS2 timing cover set
• Rollmaster LS2 single-roller timing set

Specifications

• New TSP Re-sleeved Gen 4 Aluminum Engine Block with Darton Stepped Sleeves
• TSP Forged 4.00" Stroke Wet Sump Crankshaft (choose between 24x or 58x Reluctor Wheel)
• TSP 6.125" Super I-Beam Connecting Rods with ARP L19 Rod Bolts
• Wiseco 4.125" Forged Piston Set with -20cc Dish
• Wiseco Upgraded HD Piston Wrist Pins
• Wiseco Steel Top/Napier 2nd Ring Set
• ARP Main Stud Kit
• 12 Quarts of Break-In Oil included
• Complete Set of TSP Windage Tray Spacers

Fitment

This short block is compatible with a variety of GM models, making it a versatile choice for your performance upgrades:

• Cadillac CTS-V 2004-2015
• Cadillac Escalade 2005-2014
• Chevrolet Camaro 1998-2015
• Chevrolet Corvette 1997-2013
• Chevrolet Silverado 1500 1999-2013
• Chevrolet SS 2014-2017
• Chevrolet Suburban 2000-2014
• Chevrolet Tahoe 2000-2014
• Chevrolet Trailblazer 2006-2009
• GMC Sierra 1500 1999-2013
• GMC Yukon 1999-2014
• Pontiac Firebird 1998-2002
• Pontiac G8 2008-2009
• Pontiac GTO 2004-2006
• Universal Retrofit 1997-2016

Important Note

• Competition Use Only, Not Legal for Road Use

With the TSP-427RESL-CLEETUS-SB, you're not just upgrading your engine; you're stepping into the same power plant that helped redefine performance in the automotive world. Whether you're a seasoned builder or just getting started, this short block is ready to take your ride to the next level.