EFI Intake Manifold GM LS3 Single Plane

The Holley EFI Intake Manifold GM LS3 Single Plane (model 300-290) is a race-engineered single-plane aluminum intake designed for LS-series engine platforms requiring maximum flow potential and peak horsepower delivery. This square-bore EFI intake manifold features Holley's split-design architecture, optimizing runner geometry for high-RPM performance while maintaining consistent fuel distribution across all cylinders in naturally aspirated or boosted applications.

Constructed from lightweight aluminum and finished in natural (unpainted) form, the 300-290 weighs 26.35 lbs and integrates directly with LS3 head ports without adapter plates. The single-plane design prioritizes runner velocity and scavenging efficiency at sustained high load conditions—critical for competition engines where fuel atomization and intake charge velocity directly translate to measurable power gains. The split EFI design ensures precise injector placement and consistent mixture distribution, eliminating the cold-start and part-throttle enrichment issues common to carbureted alternatives on race-tuned builds.

This manifold serves engine builders and performance shops preparing LS-platform powerplants for road racing, drag strip duty, or naturally aspirated high-revving applications where single-plane architecture is mandatory. The intake's compact envelope (14.3 x 10 x 22.8 inches) fits within standard engine bay constraints while accommodating modern fuel injection control systems. Buyers integrating this intake should verify OEM or aftermarket ECU compatibility and confirm fuel rail routing with their tuning platform before final installation.