LS3 525HP Long Block

LS3 525HP Long Block

OUR MOST POWERFUL NATURALLY ASPIRATED 6.2L!
With Chevrolet Performance’s aggressive ASA camshaft – developed for the high-rpm world of circle-track racing – installed in the LS3 6.2L engine, it comes alive with 525 uncompromising horsepower. That makes it the most powerful naturally aspirated 6.2L street engine in our portfolio – and one that has an edge to it. You’ll notice it in the idle quality and you’ll feel it when the revs quickly climb.

The ASA camshaft is a hydraulic roller with .525-inch lift on both sides, along with 226 degrees duration on the intake side and 236 degrees on the exhaust side. Coupled with a tight, 110-degree lobe separation angle, it helps the engine deliver excellent throttle response and breathe exceptionally well at high rpm. And for durability, we complement the cam with higher-rate valve springs.

TECH SPECS
Part Number: 19420386 / 19432557 / 19434648
Engine Type: LS-Series Gen IV Small-Block V-8
Displacement (cu in): 376 cu in (6.2L)
Bore x Stroke (in): 4.065 x 3.622 (103.25 x 92mm)
Block (P/N 12623967): Cast aluminum with 6-bolt, cross-bolted main caps
Crankshaft (P/N 12597569): Nodular iron
Connecting Rods (P/N 12607475): Powdered metal
Pistons (P/N 19207287): Hypereutectic aluminum
Camshaft Type (P/N 88958770): Hydraulic roller
Valve Lift (in): 0.525 intake / 0.525 exhaust
Camshaft Duration (@0.050 in): 226° intake / 236° exhaust
Cylinder Heads (P/N 12629063): Aluminum L92-style port; as cast with 68cc chambers
Valve Size (in): 2.165 intake / 1.590 exhaust
Compression ratio: 10.7:1
Rocker Arms (P/N 12669995 int): Investment cast, roll trunnion
Rocker Arms (P/N 12669993 exh): Investment cast, roll trunnion
Rocker Arm Ratio: 1.7:1
Recommended Fuel: Premium pump
Maximum Recommended RPM: 6,600
Reluctor Wheel: 58x
Balanced: Internal

INSTALLATION NOTES
• Assembly does not include any electronics, intake manifold, fuel system , ignition. 
• Includes Chevy F-Body wet sump oil pan
• Intended for pre-1976 street vehicles or any off-road vehicle
• Not intended for marine applications

Off road use only.