Intake Plenums, Elbows & Valley Covers

Maximize your engine’s air volume, optimize throttle body routing, and properly seal your engine block with high-performance intake plenums, elbows, and valley covers. When building a high-horsepower EFI setup or a custom V8 engine swap, standard factory intake components often restrict airflow, create severe clearance issues, or fail under high boost. The intake plenum acts as the main reservoir for incoming air; upgrading to a high-volume fabricated or cast plenum ensures equal air distribution to every cylinder runner, which is critical for preventing lean conditions in turbocharged or high-RPM naturally aspirated engines.

To seamlessly connect your throttle body to the intake manifold or intercooler piping, precision-cast and fabricated intake elbows provide a smooth, high-velocity transition. These elbows are essential for adapting different throttle body bolt patterns and mounting angles—especially popular in custom LS and Ford EFI conversions. Finally, complete your V8 engine build with a heavy-duty billet aluminum valley cover. Designed to seal the lifter valley below the intake manifold, aftermarket valley covers offer improved block rigidity, low-profile clearance for fabricated race manifolds, and options for integrated oil fill or breather ports. Explore our selection of high-flow plenums, transition elbows, and billet valley plates engineered for custom fabrication and serious engine builds.