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Parts intended for competition use only*
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Proposition 65 Warning*
A Chevrolet Performance Parts RLB Engine

Spec-Based, Off-Road Racer

Spec-Based, Off-Road Racer
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Parts intended for competition use only*
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Proposition 65 Warning*
A Yellow Horsepower Icon

Based on LS3

6.2L
Two Yellow Gears Slightly Apart with an Arrow Pointing at a Curve from the Left One to the Other

Up to

533 hp

Horsepower*
A Yellow Speedometer Icon

Up to

477 lb.-ft.

Torque*
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Up to

376 (6.2L)

Displacement

Off-Road Engine

525 RLB

CT525 designed for off-road competition use.

A Chevy Performance Parts 525 RLB Crate Engine

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CT525 designed for off-road competition use.

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Tech Specs
View in 2025 Catalog

Performance

Horsepower:

533 hp @ 6,600 rpm

Torque:

477 lb.-ft. @ 5,200 rpm

Max Rec RPM:

6,700

Internal Components

Crankshaft:

Nodular iron

Connecting Rods:

Powder metal with ARP bolts

Pistons:

Forged aluminum

Camshaft Type:

Hydraulic roller

Rocker Arms:

Investment-cast, roller trunnion

Engine Basics

Part Number:

19435005

Engine Type:

LS-Series Gen IV Small-Block V8

Displacement:

376 cu. in. (6.2L)

Block:

Cast aluminum with 6-bolt, cross-bolted main caps

Balanced:

Internal

Balanced:

Internal

Measurements

Bore x Stroke:

4.065 in. x 3.62 in. (103.25 x 92mm)

Valve Lift (in):

.525 intake / .525 exhaust

Camshaft Duration (@.050 in):

226° intake / 236° exhaust

Compression Ratio:

10.7:1 nominal

Rocker Arm Ratio:

1.7:1

Cylinder Head and Valves

Cylinder Heads:

LS3 rectangular port; aluminum as-cast with 68cc chambers

Valve Size (in.):

2.165 intake / 1.590 exhaust; stainless steel

Fuel and Ignition

Recommended Fuel:

Premium pump

Reluctor Wheel:

58x

Show Less

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Tech Specs

Performance

Horsepower:

533 hp @ 6,600 rpm

Torque:

477 lb.-ft. @ 5,200 rpm

Max Rec RPM:

6,700

Engine Basics

Part Number:

19435005

Engine Type:

LS-Series Gen IV Small-Block V8 

Displacement:

376 cu. in. (6.2L)

Block:

Cast aluminum with 6-bolt, cross-bolted main caps

Balanced:

Internal

Measurements

Bore x Stroke:

4.065 in. x 3.62 in. (103.25 x 92mm)

Valve Lift (in):

.525 intake / .525 exhaust

Camshaft Duration (@.050 in):

226° intake / 236° exhaust

Compression Ratio:

10.7:1 nominal 

Rocker Arm Ratio:

1.7:1

Internal Components

Crankshaft:

Nodular iron

Connecting Rods:

Powder metal with ARP bolts 

Pistons:

Forged aluminum

Camshaft Type:

Hydraulic roller

Rocker Arms:

Investment-cast, roller trunnion

Cylinder Head and Valves

Cylinder Heads:

LS3 rectangular port; aluminum as-cast with 68cc chambers

Valve Size (in.):

2.165 intake / 1.590 exhaust; stainless steel

Fuel and Ignition

Recommended Fuel:

Premium pump

Reluctor Wheel:

58x

#/#
View in 2025 Catalog
The 525 RLB Crate Engine

Product Spotlight

The 525 RLB
Crate Engine

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