SBC 245cc CNC Alum Heads Eliminator NPP Racing

The SBC 245cc CNC Alum Heads Eliminator NPP Racing cylinder heads from Air Flow Research represent purpose-built performance architecture for serious small-block Chevy engine builders and competitive racers. These assembled heads deliver the flow characteristics and combustion efficiency demanded by high-RPM eliminator-class racing platforms, where marginal gains in volumetric efficiency directly translate to measurable power gains and lap-time improvements. Built for operators who understand that cylinder head selection is foundational to reliable, repeatable engine performance—whether on the dyno or at the track.

These CNC-ported aluminum heads feature a 245cc intake runner volume optimized for mid-to-high RPM breathing, paired with a 70cc chamber that supports aggressive ignition timing and fuel delivery tuning. The 2.125-inch inlet and 1.600-inch exhaust valve configuration maximizes flow area while maintaining structural durability under sustained competition loads, and the 1.550-inch valve springs provide spring pressure adequate for mechanical and solid-lifter camshaft profiles. Angle-plug configuration permits optimal spark positioning for flame-front propagation and complete combustion, critical factors in eliminator racing where detonation margin and thermal efficiency determine consistency. At 62 pounds per pair, the weight is consistent with modern aluminum casting practices, reducing reciprocating mass and lowering overall engine inertia.

Racers, engine builders, and performance enthusiasts restoring or building small-block Chevy platforms benefit from these heads' proven track record in bracket racing and street-strip applications. Compatibility is confirmed for small-block Chevy configurations; installation demands precise deck height measurement, proper gasket selection, and verification of valve clearance with your specific camshaft profile. The Eliminator designation indicates suitability for competitive eliminator classes where repeatable, reliable power delivery under controlled conditions is non-negotiable. Pair these heads with matched intake manifolds, fuel systems, and ignition tuning for optimized results.