Chevrolet Performance 19435106 LS3 430HP Long Block

(1 customer review)


  • 430 hp @ 5,900 rpm/424 lb.-ft. @ 4,600 rpm
  • Inteded for pre-1976 street vehicles or any off-road vehicle
  • 58X Crankshaft Reluctor


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LS3/430 HP Long Block

Two letters say it all: L.S. When you think of the world’s stoutest V8, with the most potential to turn out reliable power numbers that make lesser motors cry uncle, there’s only one. Chevrolet’s legendary LS V8 has gone through several stages of evolution, and the LS3 is among the most popular for engine swaps and for the ultimate range of tuning and induction possibilities. With a bomb-proof bottom end and high-flow L92 rectangular port heads, this 6.2L monster arrives with 430hp and 425 lb./ft. of torque right out of the crate. The LS3 is a compact and lightweight V8 that will drop right into a surprising number of applications. Coming straight from the GM factory, the LS3 crate engine features modern manufacturing technology that offers increased reliability and a staggeringly flat torque curve. But the old-school engine architecture means you can also enjoy that classic Chevy V8 sound and feel.

Karl Kustom’s Chevrolet LS3 V-8 Long Block crate engine features:

  • 430 hp @ 5,900 rpm/425 lb.-ft. @ 4,600 rpm
  • L92 rectangular port heads
  • Hydraulic roller camshafts
  • 6,600 rpm redline

What’s Included

  • Fully-assembled GM manufactured long block
  • Oil pump, pick-up and Camaro F-body style oil pan
  • Harmonic Balancer
  • Front timing cover
  • Oil filter

Important Notes

  • Assembly does not include electronics, intake manifold, fuel system, coolant crossover, exhaust manifolds, oil dipstick, dipstick tube, or ignition
  • Includes Chevy F-Body style wet sump oil pan
  • Intended for pre-1976 street vehicles or any off-road vehicle
  • Not intended for marine applications
Weight 486 lbs

Manufacturer Part Number



19420382, 19432422, 19434644

LS3/430HP Long Block Tech Specs

  • Part Number: 19435106
  • Power: 430 hp @ 5900 rpm / 425 lb.-ft. @ 4600 rpm
  • 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: Cast-aluminum with 6-bolt, cross-bolted main caps
  • Crankshaft: Nodular iron
  • Connecting Rods: Powdered metal
  • Pistons: Hypereutectic aluminum
  • Camshaft Type: Hydraulic roller
  • Valve Lift (in): .551 intake / .522 exhaust
  • Camshaft Duration (@.050 in): 204° intake / 211° exhaust
  • Cylinder Heads: 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: Investment-cast, roller trunnion
  • Rocker Arms: Investment-cast, roller trunnion
  • Rocker Arm Ratio: 1.7:1
  • Recommended Fuel: Premium pump
  • Maximum Recommended rpm: 6,600
  • Reluctor Wheel: 58x
  • Balanced: Internal

Chevrolet Performance Crate Engines carry a 24 Month or 50,000 mile warranty (whichever comes first) when installed by a qualified independent service center. Chevrolet Performance Crate Engines also come with a 30 day start up warranty (parts only).

There are some additional limitations on the warranty – please see the official GM warranty documentation for more information.

$350 Rebate on LS Engine and Long Blocks through July 31, 2024. Click here for details.

1 review for Chevrolet Performance 19435106 LS3 430HP Long Block

  1. redchevyman (verified owner)

    The LS3 long block is the best way to start your custom LS street rod engine. And Karl Kustoms is the best place to buy it from. Fantastic customer support and service. Adam is great at communication and post sale support.

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Prop65WARNING: These auto parts can expose you to chemicals including phthalates and lead. Installing or using these parts can expose you to other parts containing these chemicals and to engine exhaust, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to

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