Chevy Gen 3 & Gen 4 LS Crate Engines

Gen 3 LS crate engines and Gen 4 LS crate engines are a great alternative to rebuilding your own engine or pulling an LS long block from the local scrapyard.

LS engines...

Gen 3 LS crate engines and Gen 4 LS crate engines are a great alternative to rebuilding your own engine or pulling an LS long block from the local scrapyard.

LS engines can be swapped anywhere that a Gen 1 or Gen 2 small block Chevy (SBC) engine will fit. The engine blocks, available in both aluminum and cast iron, can easily handle over 800 horsepower.

Due to LS engines’ high degree of parts interchangeability and excellent aftermarket support, every engine in the LS engine family—even the humble cast iron truck motors—have the potential to make more power than a supercharged LS9.

5.3L and 5.7L LS Crate Engines

Gen 3 LS crate engines and Gen 4 LS crate engines are a great alternative to rebuilding your own engine or pulling an LS long block from the local scrapyard.

LS engines can be swapped anywhere that a Gen 1 or Gen 2 small block Chevy (SBC) engine will fit. The engine blocks, available in both aluminum and cast iron, can easily handle over 800 horsepower.

5.3L and 5.7L LS Crate Engines

The 5.7L Gen 3 LS1 started it all in 1997. With an aluminum block, 2.000 in. intake valves, and 67cc combustion chambers, the stock LS1 could make 350 hp. The upgraded LS6 managed another 50 hp thanks mostly to a hotter cam and the 243 heads with smaller combustion chambers and more port volume.
The 5.3L Gen 3 iron block LM7 is hard to beat if you’re on a budget. It’s no slouch at close to 300 hp stock. Plus, it can be stroked to 383 c.i.d. and upgraded with many LS1/LS6 parts. You will find the LM7 under the hood of many boosted LS swaps.

6.0L LS Crate Engines

The 6.0L Gen 4 aluminum block LS2 makes about 400 hp stock and uses the same cathedral port heads as the LS6.
The LQ4 is a 6.0L Gen III engine with a cast iron block. It makes over 300 hp stock. Like the LM7, it’s great for budget builds and boost. LQ4s can be stroked to 408 c.i.d and upgraded with many LS3 parts.

6.2L LS Crate Engines

The 6.2L Gen 4 aluminum block LS3 got new rectangle port heads, 2.165 in. intake valves and 70cc combustion chambers. A stock LS3 churns out over 425 hp stock and is commonly stroked to 415 or 416 c.i.d.

7.0L+ LS Crate Engines

With a 4.000 in. stroke GM managed to get 427 c.i.d. out of the aluminum block LS7. They didn’t stop there. A forged crank, titanium rods, 2.200 in. titanium intake valves, square port CNC-ported heads, and dry sump oiling is good for over 500 hp stock.
Chevrolet Performance saw a need for big-displacement cast iron blocks so they brought us the LSX Bowtie Block. It’s similar to the LS7 block with some extra material in high stress areas. Available in 376 and 454 c.i.d. and capable of even more, crate engines with these blocks can make up to 2,000 hp on nitrous or boost.

Thanks to increased distance between the cam and crankshaft centerline, LS engines are practically made for stroker cranks. Improvements from the original SBC to LS didn’t stop with the block. LS cylinder heads are optimized for flow with cathedral shaped, symmetrical intake ports and low valve angles.

While there were many small changes across different models, some of the biggest came with the transition from the Gen 3 to the Gen 4. The Gen 4’s reluctor wheel increased from 24 to 58 teeth. There are provisions for Active Fuel Management (AFM) and Variable Valve Timing (VVT).

Whether you’re looking for a bare long block or a turnkey option complete with fuel injection or a carburetor, Summit Racing offers crate engines from Mast, Chevrolet Performance, BluePrint Engines, Edelbrock, ATK, and more.

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Results 1 - 25 of 104

BluePrint Engines Pro Series Chevy LS 427 C.I.D. 605 HP Long Block Crate Engines PSLS42730CT

Engine Long Block Iron Block 427 c.i. GM LS style proseries engine - longblock. incl. 30 month / 50,000 warranty & Dyno

Part Number: MLL-PSLS42730CT

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Tomorrow

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Summit Racing™ Chevy LS 5.3L 450HP Long Block Crate Engines SUM-150153

Crate Engine, Long Block, Chevy LS, 5.3L/323, Gen 3, 24x Crank Reluctor, Aluminum Heads, Small Block, Each

Part Number: SUM-150153

4.38 out of 5 stars ( 37 )

Estimated Ship Date: Tomorrow

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ATK High Performance Chevy LQ4 6.0L 460 HP Long Block Crate Engines HP93

Crate Engine, Chevy LQ4 6.0L, Long Block, Internal Engine Balance, Aluminum Heads, Each

Part Number: HPE-HP93

4.4 out of 5 stars ( 10 )

Estimated Ship Date: Tomorrow

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BluePrint Engines Pro Series Chevy LS 376 C.I.D. 530 HP EFI Base Dressed Long Block Crate Engines PSLS37650CTF

Crate Engine, Pro Series 530 HP EFI Base Dressed Long Block, Assembled, Internal Balance, Aluminum Cylinder Heads, Chevrolet, 6.2L LS, Each

Part Number: MLL-PSLS37650CTF

Not Yet Reviewed

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Chevrolet Performance LSX376 Crate Engines 19434412

Crate Engine, LSX376-B15, Long Block, 6.2L, 376cid, 473 HP, 9.0:1 Compression, Cast Iron Block, Aluminum Heads, Hydraulic Roller Cam, Chevy, GMC, Each

Part Number: NAL-19434412

Not Yet Reviewed

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BluePrint Engines Pro Series Chevy LS 376 C.I.D. 530 HP EFI Base Dressed Long Block Crate Engines PSLS3763CTFK

Crate Engine, Fully Dressed Long Block, GM LS Series 376 C.I.D., Internal Engine Balance, Aluminum Cylinder Heads, Chevy, 6.2L LS, Each

Part Number: MLL-PSLS3763CTFK

Not Yet Reviewed

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BluePrint Engines Pro Series Chevy LS 376 C.I.D. 530 HP EFI Base Dressed Long Block Crate Engines PSLS3765CTF

Crate Engine, Fully Dressed Long Block, GM LS Series 376 C.I.D. 546 HP, 469 Ft Lbs Tq, Internal Engine Balance. Harness, ECU, Each

Part Number: MLL-PSLS3765CTF

Not Yet Reviewed

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BluePrint Engines Pro Series Chevy LS 376 C.I.D. 530 HP EFI Base Dressed Long Block Crate Engines PSLS37630CTF

Crate Engine, Base Long Block, GM LS Series 376 C.I.D., Internal Engine Balance, Aluminum Cylinder Heads, Chevy, 6.2L LS, Each

Part Number: MLL-PSLS37630CTF

Not Yet Reviewed

Estimated Ship Date: Tomorrow

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BluePrint Engines Pro Series Chevy LS 427 C.I.D. 605 HP EFI Base Dressed Long Block Crate Engines PSLS4273CTFKB

Engine 427 c.i. GM LS Style Proseries Iron Block, GM Intake, GM Controller, BPE Pulley Kit

Part Number: MLL-S0012

Not Yet Reviewed

Estimated Ship Date: Tomorrow

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BluePrint Engines Chevy LS 376 C.I.D. 530 HP EFI Retrofit Dressed Long Block Crate Engines PSLS3760CTF

Crate Engine, Base Long Block, GM LS Series 376 C.I.D., Internal Engine Balance, Aluminum Cylinder Heads, Chevy, 6.2L LS, Each

Part Number: MLL-PSLS3760CTF

4.83 out of 5 stars ( 6 )

Estimated Ship Date: Tomorrow

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BluePrint Engines Pro Series Chevy LS 376 C.I.D. 530 HP EFI Base Dressed Long Block Crate Engines PSLS3763CTF

Engine Complete Assembly Iron Block 376 c.i. GM LS style proseries dressed engine with efi -. incl. 30 month / 50,000 warranty & Dyno

Part Number: MLL-PSLS3763CTF

Not Yet Reviewed

Estimated Ship Date: Tomorrow

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BluePrint Engines Pro Series Chevy LS 376 C.I.D. 530 HP Long Block Crate Engines PSLS37630CT

Crate Engine, Long Block, GM LS Series 376 C.I.D., 520 HP, Internal Balance, Aluminum Cylinder Heads, Chevy, 6.2L LS, Each

Part Number: MLL-PSLS37630CT

Not Yet Reviewed

Estimated Ship Date: Tomorrow

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BluePrint Engines Pro Series Chevy LS 427 C.I.D. 605 HP EFI Base Dressed Long Block Crate Engines PSLS42730CTF

Engine Complete Assembly Iron Block 427 c.i. GM LS style proseries dressed engine -. incl. 30 month / 50,000 warranty & Dyno

Part Number: MLL-PSLS42730CTF

Not Yet Reviewed

Estimated Ship Date: Jun 12, 2025 if ordered today

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Estimated Ship Date: Jun 12, 2025 if ordered today

ATK High Performance GM 408 LQ4 Stroker 600 HP Stage 1 Long Block Crate Engines LS01

Crate Engines, GM 408 LQ4 Stroker 600 HP Stage 1 Long Block, 6.7L/408, Assembled, Internal Balance, Aluminum Heads, Chevrolet, Small Block LS, Each

Part Number: HPE-LS01

Not Yet Reviewed

Estimated Ship Date: Aug 18, 2025 if ordered today

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Estimated Ship Date: Aug 18, 2025 if ordered today

Chevrolet Performance LT4 6.2L Supercharged Wet Sump Crate Engines 19431955

Crate Engine, LT4 Supercharged, 650 hp/ 650 lbs/ft. Torque, Wet Sump, Aluminum Block/Heads, Chevy, Each

Part Number: NAL-19431955

1.5 out of 5 stars ( 2 )

Estimated Ship Date: Tomorrow if ordered today

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BluePrint Engines Pro Series Chevy LS 376 C.I.D. 530 HP EFI Base Dressed Long Block Crate Engines PSLS3765CTFKB

Engine 376 c.i. GM LS Style Proseries Iron Block, Fabbed Alum Intake, E Controls, BPE Pulley Kit

Part Number: MLL-S0011

Not Yet Reviewed

Estimated Ship Date: Jul 21, 2025 if ordered today

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Estimated Ship Date: Jul 21, 2025 if ordered today

BluePrint Pro Series Chevy LS 427 C.I.D. 800 HP EFI Supercharged Deluxe Long Block Crate Engines PSLS4279SCTK

427 c.i. GM LS style proseries dressed engine with Supercharger and Polished Pulley Kit -. incl. 30 month / 50,000 warranty & Dyno

Part Number: MLL-PSLS4279SCTK

Not Yet Reviewed

Estimated Ship Date: Jul 21, 2025 if ordered today

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Estimated Ship Date: Jul 21, 2025 if ordered today

BluePrint Pro Series Chevy LS 376 C.I.D. 700 HP EFI Supercharged Deluxe Long Block Crate Engines PSLS3769SCTKB

376 c.i. GM LS style proseries dressed engine with Supercharger and Black Pulley Kit -. incl. 30 month / 50,000 warranty & Dyno

Part Number: MLL-S0037

Not Yet Reviewed

Estimated Ship Date: Jul 21, 2025 if ordered today

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Estimated Ship Date: Jul 21, 2025 if ordered today

BluePrint Engines Pro Series Chevy LS 427 C.I.D. 625HP EFI Retrofit Dressed Long Block Crate Engines PSLS4272CTF

Crate Engines, Pro Series Chevy LS 427 C.I.D. 625 HP EFI, Long Block, 7.0L/427, Assembled, No Intake/ECU, Chevrolet, Small Block LS, 58X Reluctor,Each

Part Number: MLL-PSLS4272CTF

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Tomorrow

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BluePrint Engines Pro Series Chevy LS 376 C.I.D. 530 HP EFI Base Dressed Long Block Crate Engines PSLS3763CTFKB

Engine 376 c.i. GM LS Style Proseries Iron Block, GM Intake, GM Controller

Part Number: MLL-S0010

Not Yet Reviewed

Estimated Ship Date: Tomorrow

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BluePrint Engines Pro Series Chevy LS 427 C.I.D. 625 HP EFI Fully Dressed Long Block Crate Engines PSLS4272CTFK

Crate Engines, Pro Series Chevy LS 427 C.I.D. 625 HP EFI Fully Dressed Long Block, 7.0L/427, Assembled, Throttle Body, Chevrolet, Small Block LS, Each

Part Number: MLL-PSLS4272CTFK

Not Yet Reviewed

Estimated Ship Date: Tomorrow

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BluePrint Engines Pro Series Chevy LS 427 C.I.D. 605 HP EFI Base Dressed Long Block Crate Engines PSLS4273CTF

Engine Complete Assembly Iron Block 427 c.i. GM LS style proseries dressed engine with efi -. incl. 30 month / 50,000 warranty & Dyno

Part Number: MLL-PSLS4273CTF

Not Yet Reviewed

Estimated Ship Date: Tomorrow

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Chevrolet Performance LS3 6.2L E-Rod Long Block Crate Engines 19421057

Crate Engine, GM 6.2L, 430 HP, LS3 E-Rod, Internal Engine Balance, Aluminum Heads, Each

Part Number: NAL-19421057

Not Yet Reviewed

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ATK Marine Rebuilt Long Block Engines VMT23MC

Engine Long Block, 6.0 Liter, 364 C.I. Hydraulic Roller Camshaft, Valve Cover, Oil Pan, Timing Chain Cover, Marine,Catalytic Converter, Chevy LS, Each

Part Number: HME-VMT23MC

Not Yet Reviewed

Estimated Ship Date: Aug 11, 2025 if ordered today