427-441 LS Re-Sleeve Long Block


The ‘Fourth Generation’ 427-441 Aluminum Long Block Engine Starts with a Brand New GM Gen4 light-weight Aluminum Block that has been re-sleeved with Darton Sleeves. This allows for the more favorable 4.125 large bore. Choose a standard 427 or remarkable 441 Cubic Inch pit bull that has a proven 4340 Forged Crankshaft. For strength, we use 4340 Forged H-Beam Rods and 10.9 to 1 Forged Pistons. Our PM Proprietary CNC LS3 Rectangle Port 255-cc Aluminum Heads feature 11Deg valve angles paired with LS3 intake runners for a miriad of manifold options.

Payment Plans Available!paytommorrow_logo 427-441 LS Re-Sleeve Long Block Engine: L441-HRA-LB4-1Get Pre-Approved

Fuel Type

Fuel Type

Pump Gas


Idle Quality

Idle Quality

Best Use

Best Use

Street / Strip
Horsepower: 575-600+
Torque: 525+ varies with camshaft
Bore/Stroke: 4.00/4.125 x 4.125
Compression: 10.9:1
Fuel Type: Premium Pump Gas
Block: GM Aluminum Re-sleeved, New
Crankshaft: 4340 Forged Steel
Rods: 4340 Forged H-Beam
Pistons: 2618 Forged Aluminum
Bearings: King XP
Camshaft: Hydraulic Roller
Heads: Aluminum LS3 - CNC Ported
Valves: 2.165 / 1.590
Rocker Arms: Steel / Roller Trunion
Intake: LS3, Not Included
Oil Pan: Champ Muscle Car Swap
Valve Covers: Not Included
Power Adder: Not Included
Fuel Delivery: Not Included
Ignition: Not Included
Dyno Testing Image

Dyno Testing

Dyno testing not included in long block price. Here at Prestige Motorsports, our “Dyno Promise” means that we dyno test every engine we build to verify the quality of our work, the integrity of each component, and the reliability of every engine we construct. Then, we deliver the dyno results for your project directly to you, the customer. Hours for dyno testing will be calculated with the purchase of the fuel and ignition group per engine order.

Engines will produce +/- 2% of advertised power at the flywheel. Advertised power levels are achieved using an electric water pump and specific induction and exhaust systems. Power will vary after pulley systems are installed or if changes are made to the induction or exhaust system (e.g. camshaft, cylinder head, compression, intake manifold, exhaust headers, air filters, etc.). Chassis dyno results measure power at the wheels and only calculate flywheel horsepower. Wheel horsepower is affected by a variety of vehicle-specific criteria including driveline design, body and chassis flex, air intake location, etc. Therefore, calculating flywheel horsepower from wheel horsepower is not an accurate representation of actual flywheel horsepower.

Warranty Image


This Prestige Motorsports engine is built to order and comes with a 3-year, unlimited miles warranty. Our warranty covers the base engine from intake manifold to oil pan.