Killshot II 4-bbl EFI System Master Kit

The Killshot II 4-bbl EFI System Master Kit by ACES FUEL INJECTION delivers precision electronic fuel injection conversion for classic and street performance vehicles. This comprehensive system addresses the core challenges of carburetor-to-EFI transition: inconsistent cold starts, fuel puddle formation, and poor throttle response across temperature ranges. Designed for enthusiasts and professional builders who demand reliable, repeatable power delivery without sacrificing the character of their build, the Killshot II system is engineered to bolt onto existing four-barrel intake manifolds while maintaining compatibility with original engine bays.

The four-barrel electronic fuel injection architecture uses individual fuel rails and injectors precisely calibrated for even distribution across all four runners, eliminating the lean/rich cylinder variation common in traditional carburetors. ACES' proven ECU tuning algorithms adapt fuel mapping in real time, responding to intake air temperature, engine load, and throttle position for optimal combustion efficiency and reduced emissions. The complete master kit includes fuel rails, injectors, regulator, pump module, wiring harness, and sensor suite—everything needed to transition from mechanical fuel delivery to closed-loop digital control. Stainless fasteners and corrosion-resistant components ensure longevity in varying climates.

This system is ideal for small-block and mid-block V8 conversions, LS platform swaps, and vintage muscle car restorations where OEM fuel injection is unavailable or undesirable. Installation requires basic mechanical knowledge and standard hand tools; no custom machining is needed on stock intake manifolds. The Killshot II integrates with existing wiring via plug-and-play connectors and works with both mechanical and electric fuel pumps, offering flexibility for single-tank or dual-tank fuel cell setups. Builders consistently report improved driveability, cold-start reliability, and highway fuel economy compared to even well-tuned carburetors, making this master kit an excellent foundation for any street or strip application.