Overview

Chevrolet Performance LS3 525 RLB 376/533 Racing Long Block Crate Engines

Chevrolet Performance's 525 RLB is based on the LS engine family and is like the 6.2L CT525 but sold as a sealed long block for universal racing sanctioning bodies. The high-revving 525 RLB crate engine is assembled with strong forged pistons and heavy-duty connecting rod bolts designed to support its performance capability and enhance its durability. With its deep-breathing LS3 rectangular-port cylinder heads, it is a combination rated at 533 horsepower at 6,600 rpm and a strong 477 lbs.-ft. of torque at 5,200 rpm, when used with a 4-barrel carburetor and intake manifold, per Chevrolet Performance testing.

The engine assembly comes with coil-on-plug ignition and an SFI-certified balancer, along with a 6-quart racing oil pan and more. All that's needed to complete the assembly is an induction and ignition system—and those components are also available from Chevrolet Performance (*refer to installation information noted below).

*Installation Notes: Requires addition of induction and ignition control system, starter, fuel system, exhaust system and front accessory drive system The 6-quart racing oil pan is designed to clear most GM rear-steer chassis with stock engine location. The long block is designed for universal racing sanctioning bodies. It is not intended for street use. The 525RLB does not included water pump, intake manifold or factory exhaust manifolds. Chevrolet Performance Racing Long Block engines include factory-installed anti-tampering seals.

Technical Specifications:

* Engine Type: LS-Series Gen IV Small-Block V-8
* Displacement (cu. in.): 376 (6.2L)
* Bore x Stroke (in.): 4.065 x 3.62 (103.25 x 92mm)
* Block: Cast aluminum with 6-bolt, cross-bolted main caps
* Crankshaft: Nodular iron
* Connecting Rods: Powder metal with ARP bolts
* Piston: Forged aluminum
* Camshaft Type: Hydraulic roller
* Valve Lift (in): .525 intake / .525 exhaust
* Camshaft Duration (@.050 in): 226° intake / 236° exhaust
* Cylinder Heads: LS3 rectangular port; aluminum as-cast with 68cc chambers
* Valve Size (in): 2.165 intake / 1.590 exhaust
* Compression Ratio: 10.7:1 Nominal
* Rocker Arms (P/N: 12696105 int.): Investment-cast, roller trunnion
* Rocker Arms (P/N: 12681275 exhaust): Investment-cast, roller trunnion
* Rocker Arm Ratio: 1.7:1
* Recommended Fuel: Premium pump
* Maximum Recommended rpm: 6,700
* Reluctor Wheel: 58x
* Balanced: Internal

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