Bare GM LS3 4 Bolt 276cc CNC Ported Aluminium Cylinder Heads with 70cc Chamber (Pair) 2.60" x 1.28" Intake Port, 1.47" x 1.64" Exhaust Port

The Aeroflow Series of Aluminium Cylinder Heads are taking affordable performance street and strip cylinder heads to the next level. Theseheads utilise ultra-smooth A356-T6 aluminium castings, new as-cast runner and chamberdesigns produce excellent flownumbers. This combined with a 5-angle competition valve job,diamond-honed bronze guides, hand bowl blending and professional assembly help to outperform some of the best brands in the business.

The Aeroflow Performance GM LS cylinder heads are designed for street / race performance engines to give the ultimate in flow at acompetitive price. Made from A356-T6 aluminium castings andfeature full CNC ports and combustion chambers. These 15° LS3 Rectangle Port heads are designed to fit LS series engines with a 4.00" or larger bore. These bare 276cc heads accept 2.165" diameter intake valves and 1.59" exhaust valves and have a thicker thanstock .625" deck thickness. Available in OE 4-bolt design or 6-bolt designto suit standard or LSX block designs.

Note: Thread sealant must be used on all rocker bolts asthreads intersect with intake ports.