276cc Aluminium Cylinder Heads w / 70cc Chambers - 4-Bolt (GM LS)

The Aeroflow Series of Aluminium Cylinder Heads are taking affordable performance street and strip cylinder heads to the next level. These heads utilise ultra-smooth A356-T6 aluminium castings, new as-cast runner and chamber designs produce excellent flow numbers. 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 a competitive price. Made from A356 aluminium castings, 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 1.60" exhaust valves and have a thicker than stock .625" deck thickness. Available in OE 4-bolt design or 6-bolt design to suit standard or LSX block designs. Note: Thread sealant must be used on all rocker bolts as threads intersect with intake ports.