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. Aeroflow's LS3 Chevy cylinder heads are designed for high performance street / race engines. Made from A356 aluminium castings. These bare cylinder heads accept 2.165" (55mm) diameter intake valves and 1.6" (40.64mm) exhaust valves. We have a 4-bolt design to suit factory 4-Bolt GM blocks or a 6-bolt design to suit standard or LSX blocks. Available in 'As Cast' or Full CNC Ported models. Head Specs: Chamber Volume: 70cc ChamberIntake port volume: 276ccIntake valve size: 2.165" (55mm)Exhaust valve size: 1.60" (40.64mm) Valve spring diameter: suit factory diameter springs Rocker style: 11 degrees LS3Spark plug style: Factory Flow Chart cfm @ H2O .100" .200" .300" .400" .500" .600" .700" 2.165 Intake 71149 222 269 301 320 329

Note: Suit GM LS 6-Bolt Block