Best LS Engines for Sale: 8 Strong Choices from X Factor Motor Sport

First, Direct answer: The best all-round LS engine in X Factor Motor Sport’s listed catalogue is the LS Classic Series ’57 Fuelie GMLS9016: it combines a complete, assembled 6.2L LS3-based package

495 advertised horsepower, EFI hardware and a distinctive vintage presentation.

Also, For a conventional performance swap, the BluePrint 530 HP EFI LS3-style long block PSLS3760CTFKB is the strongest practical alternative; for a custom naturally aspirated build

choose the ATK LS 408 SP40-G4 and specify the rest of the combination carefully.

For example, This guide ranks eight products represented in X Factor Motor Sport’s catalogue and sitemap.

Short blocks are not running, drop-in engines.

How this LS engine ranking was made

Therefore, The shortlist was taken from X Factor Motor Sport product pages and its sitemap, then checked against each page’s specifications.

Ranking factors are completeness, disclosed specifications, use case, included electronics, upgrade potential and installation risk.

First, No product is described as X Factor-tested or endorsed.

Missing specifications are marked not stated.

Also, Technical checks cover LS3 architecture and transmission options [1], LS364/450 retrofit compatibility [2]

408 stroker dimensions [3], and LS Classic injector/DBW details [4].

Ranked comparison: the best LS engines listed by X Factor Motor Sport

Therefore, | 2 | BluePrint 530 HP EFI PSLS3760CTFKB | Assembled long block | 6.2L/376 | 530 hp, 495 lb-ft | EFI

DBW throttle body, intake

First, water pump and ignition hardware |

factory-injection or carburetor flexibility |

4.030 x 4.000 in; 24T |

58T |

1. LS Classic Series ’57 Fuelie GMLS9016 — best complete vintage-style package

Also, This is the top pick for a finished LS3-based engine with modern control and period-correct visual appeal.

X Factor lists an assembled 6.2L/376 long block with aluminum block and heads, 10.7:1 compression

For example, internal balance, 58X reluctor

EFI intake, throttle body

Therefore, computer and wiring harness.

The supplier specification lists 495 hp, 473 lb-ft and a 6,600-rpm maximum recommendation [5].

First, The starter and front accessory drive are not included, ignition coils need remote mounting

and the harness requires installation.

Also, It carries competition/off-road or pre-1966 cautions, so check local emissions rules.

2. BluePrint 530 HP EFI LS3-style PSLS3760CTFKB — best performance long block

The BluePrint 530 suits a buyer who wants more stated output than the standard LS3 in an LS3-style 6.2L package.

For example, X Factor lists EFI, a 90 mm DBW throttle body

intake, coil packs

Therefore, oil pan, water pump

balancer, plugs and wires

First, plus aluminum heads, 10.7:1 compression

hydraulic roller cam and internal balance.

Also, It is not turnkey: the computer and wiring harness are not included, and calibration remains the installer’s responsibility.

3. Chevrolet Performance LS3 430 HP 19434636 — best known OEM-style baseline

The Chevrolet Performance LS3 is a strong baseline for a conventional naturally aspirated swap.

For example, Chevrolet Performance lists this configuration at 376 cubic inches/6.2L, 430 hp and 425 lb-ft [1].

X Factor identifies L92 rectangular-port aluminum heads and a 58-tooth reluctor.

Therefore, Plan for engine management, accessories, exhaust, cooling and oil-pan solutions.

“LS3” does not resolve controller or crank-trigger compatibility.

4. ATK LQ4 6.0L 460 HP HP93 — best iron-block retrofit starting point

First, The HP93 suits a builder who values an iron 6.0L base and wants to choose induction and dress-up parts.

X Factor lists a balanced LQ4-based long block with aluminum heads, hydraulic roller cam and 24-tooth reluctor.

Also, It supports factory fuel injection or carburetor conversion, but is not a direct OEM replacement and requires tuning.

It is a long block rather than a complete crate package: intake, oil pan

For example, valve covers, water pump

balancer, electronics and wiring are absent.

Therefore, The page labels it remanufactured; confirm warranty and condition before purchase.

5. ATK LS 408 SP40-G4 — best custom naturally aspirated stroker foundation

For a builder assembling a combination around a forged bottom end, SP40-G4 is compelling.

First, X Factor lists a 408-cubic-inch Gen IV LS short block with a 6.0L iron block, 4.030-inch bore

4.000-inch stroke, forged 4340 crank

Also, H-beam rods, forged dished pistons and a 24-tooth reluctor.

ATK confirms the 408 dimensions [3].

For example, Heads, camshaft, intake, fuel, ignition, oiling and accessories remain your design decisions.

X Factor identifies this version for naturally aspirated applications; do not substitute a boost/nitrous variant without reviewing ring gaps and clearances.

6. ATK LS3 415 SP74 — best aluminum-block stroker foundation

Therefore, SP74 is the shortlist’s choice for a larger-displacement aluminum LS3 block.

X Factor lists 415 cubic inches/6.8L, forged 4340 internals and a 58-tooth reluctor.

First, It is not assembled and omits oil pan, timing cover, balancer, flexplate and flywheel.

X Factor does not state output.

Also, Select heads, compression, camshaft and fuel system as one combination.

7. BluePrint 520 HP PSLS3760CT — best carbureted retrofit route

This 6.2L/376 long block suits builders who want LS displacement with a carbureted intake.

For example, X Factor lists 520 hp and 470 lb-ft, 10.7:1 compression

aluminum heads and hydraulic roller cam; water pump, oil pan

Therefore, balancer, coil packs

plugs and wires are included.

First, A separate ignition box is required.

It ranks below the EFI BluePrint because carburetor conversion is a narrower fit for modern street cars and the product lacks a carburetor, ECU and wiring harness.

Also, It suits a classic vehicle with an established carbureted strategy.

8. LS Classic 14-inch GMLS9009 — best alternative vintage appearance

GMLS9009 shares the 495-hp, 473-lb-ft 376-cubic-inch LS3-based specification with the ’57 Fuelie package but changes the visual treatment to orange paint

For example, chrome 409-style valve covers and a round chrome air cleaner.

X Factor lists EFI, computer, wiring harness, flexplate and internal balance.

Therefore, It ranks eighth because the ’57 Fuelie offers a more distinctive identity, not because GMLS9009 is technically weak.

It has the same practical cautions: no water pump, front accessory drive or starter, plus remote coil mounting.

First, Lokar notes that Modern Classic intake packages use LS3-style injectors and a 92 mm DBW throttle body, with ECU compatibility dependent on DBW and speed-density support [4].

Buying guidance and compatibility cautions

First decide whether you need a long block or a short block.

Also, A long block may omit intake, oil pan

electronics and accessories; a short block requires a matched top end.

For example, Ask for the inclusion list.

Match the reluctor and controller.

Therefore, The 24X and 58X systems need compatible sensors, electronics and calibration.

The LS364/450, for example

First, uses an early-style 24X crank and 1X cam, works with an existing Gen III controller only with tuning

and needs a rectangular-port LS3/L92 intake [2].

Also, Verify crank and cam sensors, throttle type, injector plugs and ECU support.

Check port and accessory fitment.

For example, Rectangular-port LS3/L92 heads need a compatible intake; oil-pan rail, starter

exhaust, alternator

Therefore, air conditioning, flexplate and transmission spacing are vehicle-specific.

Compatible transmissions do not make every LS a direct fit [1].

First, Finally, check legality, fuel and calibration.

Several listings carry competition/off-road or pre-1966 cautions.

Also, Confirm emissions legality, premium-fuel requirement, cooling capacity, fuel pressure and required tune.

Treat supplier power figures as advertised ratings, not X Factor test results.

Verdict

For example, Choose GMLS9016 for the most complete vintage-style EFI package, BluePrint PSLS3760CTFKB for the strongest disclosed performance long block

and Chevrolet Performance LS3 19434636 for a familiar LS3 baseline.

Therefore, Choose ATK SP40-G4 or SP74 only when you are deliberately building the rest of the engine.

The right LS engine is the one whose reluctor, ports

First, ECU, accessories

transmission and legal status match the vehicle—not simply the one with the largest number in its title.

Frequently asked questions

What is the best LS engine on X Factor Motor Sport?

Also, The LS Classic GMLS9016 is the best all-round choice here because it combines a complete assembled 6.2L LS3-based package, EFI hardware and 495 advertised horsepower.

Confirm included accessories before ordering.

Are all of these LS engines ready to install?

For example, No.

GMLS9016 and GMLS9009 are the most complete packages, but still require installation work and some accessories.

Therefore, SP40-G4 and SP74 are short blocks and require substantial additional parts.

What is the difference between 24X and 58X LS engines?

They use different crank-trigger arrangements and need compatible sensors, ECU strategy and calibration.

First, Verify the reluctor before buying; a wiring change alone may not solve incompatibility.

Is the ATK SP40-G4 suitable for boost?

The X Factor listing identifies SP40-G4 for naturally aspirated applications.

Also, ATK separately documents boost/nitrous-prepared 408 variants, so select the exact part number for the intended cylinder pressure and ring-gap requirements [3].

Do LS Classic engines include a transmission?

No.

For example, They are engine packages.

Chevrolet Performance lists compatible transmission families separately, and the vehicle still needs the correct bellhousing

Therefore, controller, flexplate or flywheel and calibration [1].

Does GMLS9009 use a carburetor?

No.

First, X Factor lists it as EFI with a throttle body, computer and wiring harness.

Its vintage appearance comes from the intake, orange finish, chrome 409-style valve covers and air cleaner.

References

[1]: https://www.chevrolet.com/performance-parts/crate-engines/ls-lsx-engines/ls3-engine “Chevrolet Performance LS3 engine family”

First, [2]: https://www.gmperformancemotor.com/parts/19434650.html “Chevrolet Performance LS364/450 technical specifications”

[3]: https://atkhp.com/product/atk-sp40-g4-b-ls-408ci-stroker-short-block-29cc-dish-pistons-24-tooth-boost-nitrous-ready/ “ATK SP40-G4-B LS 408 technical specifications”

Also, [4]: https://www.lokar.com/modern-classic-series “Lokar Modern Classic LS technical information”

[5]: https://www.speedwaymotors.com/LS-Classic-GMLS9016-LS3-57-Fuelie-Crate-Engine-Unpainted-Cast-SBC,435256.html “Modern Classic GMLS9016 specifications”

For example, [6]: https://www.speedwaymotors.com/LS-Classic-GMLS9009-LS3-14-Classic-Crate-Engine-Chrome-409-Style,435249.html “Modern Classic GMLS9009 specifications”

[7]: https://www.speedwaymotors.com/ATK-SP73-LS3-415CI-Stroker-Short-Block-4cc-Flat-Top-Pistons-58T,560661.html “ATK SP73 technical and fitment reference”

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Best LS Engines for Sale: 8 Strong Choices from X Factor Motor Sport