SPS offers a wide range of proven GM LS-series crate engines to fit every budget and performance goal—from reliable daily-driver swaps to tire-shredding monsters. These engines deliver modern efficiency, massive torque, and bulletproof reliability that old small-blocks simply can't match.

GM Automotive-Line Engines (GEN IV Car Platforms):

LS3 (6.2L) — Modern rectangle-port heads, ~430 hp factory; legendary for smooth power and high-rev capability.

LS7 (7.0L) — Hand-built beast with titanium rods/valves, ~505 hp; 427ci, naturally aspirated option for serious builds.

GM Performance Crate Engines: These turn-key options from Chevrolet Performance crank up the factory formulas with aggressive cams, better flowing components, and race-inspired tuning:

• LS3-based crates: LS376/480 (495 hp) and LS376/525 (525 hp) for naturally aspirated street/strip dominance. Along with our own variants producing the LS376/535 (535 hp) and LS376/560 (560 hp).
• LSx 376 — High-strength block ready for big power; perfect base for custom builds.
• LSx 454 — Massive displacement iron-block foundation for extreme naturally aspirated or boosted applications.
• Supercharged icons like the LSA (556–580 hp) for street-friendly forced induction; have sadly been discontinued but don't sweat it—SPS has you fully covered with superior custom supercharged builds that outperform and outlast the originals. We start with robust foundations like the proven LSA block (for that familiar architecture) or the ultra-strong RHS LS block(beefier for higher boost and abuse), then pair them with top-tier Whipple superchargers—known for massive airflow, efficient intercooling, and reliable street manners even at big power levels. These custom builds result in a reliable, tunable setup pushing 800-1,100 + hp.

SPS's in-house expertise means we handle everything—pulley sizing, fuel system upgrades, cooling, and dyno tuning—for a turn-key package that's built right and backed by real hot rod know-how.

Modern Induction Upgrades: Elevate the look and performance with our 8-Stack Fuel Injection systems—classic down-draft styling meets electronic precision for crisp throttle response and big power. Or go full show-car with the 8-Stack Cross-Ram setup: symmetrical beauty, improved airflow, and that unmistakable retro-modern vibe.

Whether you're aiming for reliable cruising, weekend warrior duties, or all-out performance, SPS has the perfect LS engine (or custom build) to transform your 69 Camaro, muscle car, or hot rod. Let's match your vision—reach out today and let's build something epic! 

Engine Management & Wiring – Plug-and-Play Reliability for Your LS/LT Swap

At SPS, we make engine management straightforward and dependable—no guesswork, no endless wiring headaches. Every harness we provide is custom-built specifically for your LS conversion’s chosen engine and transmission combination. This ensures perfect fitment, clean routing, and seamless integration into your classic muscle car, or hot rod.

Our Harness & Controller Options Include:

GM Factory-Style ECMs & TCMs

• We supply genuine GM Engine Control Modules (ECMs) and Transmission Control Modules (TCMs) matched to your crate engine (e.g., E38/T42for Gen IV LS). These come with custom programming tailored to your setup—optimized for performance, drivability, emissions delete, cam timing, torque management, and shift points. Simplified forswaps while retaining full diagnostics capabilities.

Full Diagnostic Capability

• Every SPS harness includes the Check Engine Light circuit and standard OBD-II diagnostic port (ALDL-style plug). Any shop with a basic OBD-II scanner can read/clear codes—no proprietary tools required for basic troubleshooting.

Why SPS Engine Management Stands Out:

• Tailored to Your Build — We match the harness, ECM/TCM (or standalone), and programming to your exact engine/trans combo, cam specs, throttle type (DBC/DBW), and goals (cruise, performance, or race). 
• Swap-Friendly
• Design — Clean, labeled wiring with weatherproof connectors, minimal bulk, and provisions for gauges, fans, wideband O2, etc. 
• Reliability & Support — Factory GM options keep it OEM-like and warrantied where applicable; aftermarket choices offer easier future tweaks. We handle initial programming and can guide remote tuning if needed.

Aftermarket Standalones for Maximum Flexibility.

Holley Terminator X / Terminator X Max — Popular plug-and-play EFI controllers with dedicated LS-specific harnesses. Features real-time fuel learn, boost/nitrous control, programmable I/O (fans, etc.), and built-in transmission control (on Max versions) for 4L60E through 6L80/90E.

Handheld tuning or laptop via software—ideal for carb-to-EFI conversions or full standalone swaps. 

SPS delivers a complete, ready-to-run solution that fires right up and drives like a modern vehicle in your classic shell.

Building your dream restomod? Tell us your engine/trans details, and we'll spec the perfect management package—complete, programmed, and ready to roll!