Circle Track Crate Engines - 525 RLB

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 lb.-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-near-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 all those components are also available from Chevrolet Performance.

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

TECH SPECS

• Part Number: 19435005
• 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 (P/N 12729604):Cast aluminum with 6-bolt, cross-bolted main caps
• Crankshaft (P/N 12736809): Nodular iron
• Connecting Rods (P/N 12649190): Powder metal with ARP bolts
• Pistons (P/N 19418214): Forged aluminum
• Camshaft Type (P/N 88958770): Hydraulic roller
• Valve Lift (in): .525 intake / .525 exhaust
• Camshaft Duration (@.050 in): 226° intake / 236° exhaust
• Cylinder Heads (P/N 12675871): LS3 rectangular port; aluminum as-cast with 68cc chambers
• Valve Size (in): 2.165 intake / 1.590 exhaust
• Compression Ratio:10.7:1
• Rocker Arms (P/N 12696105 int): Investment-cast, roller trunnion
• Rocker Arms (P/N 12681275 exh): Investment-cast, roller trunnion
• Rocker Arm Ratio: 1.7:1
• Recommended Fuel: Premium pump
• Maximum Recommended rpm: 6,700
• Reluctor Wheel: 58x
• Balanced: Internal