Proflow Cylinder Heads, LS SuperMax-B 260, Aluminium, Bare Cylinder Heads, LS3/L76/L77/L92/L98/LSX, 260cc Intake, 70cc Chamber, Aluminium, Bare, Pair

Proflow does not sacrifice quality for a low price- you get both with our aluminium cylinder heads. Our LS3 cylinder heads are designed for street / race performance engines to give the ultimate in flow at a competitive price. Cast from A356 aluminium, these 15° LS3 rectangle port heads are designed to fit LS series engines with a 4.00" or larger bore. These bare 275cc heads accept 2.165" diameter intake valves and 1.60" exhaust valves and have a 0.625" deck thickness. Suits 6-bolt standard or LSX block designs. Specifications: Specifications: Material: A356 Aluminium Combustion Chamber: 70cc Intake Port Volume: 260cc Intake Port Dimension: 1.285" x 2.60" Exhaust Port Volume: 100cc Exhaust Port Dimension: 1.47" H x 1.64" W Spark Plug Location: OE Intake Valve Diameter: 2.145" x 4.89" Exhaust Valve Diameter: 1.60" x 4.89" Valve Stem Diameter: 8mm Valve Spring Pocket I.D.: 1.30" Valve Guide Material: Manganese Bronze Valve Guide O.D.: 0.502" (.560" at base) Rocker Design: LS3 Rails required Valve Angle: 15° Deck Thickness: 0.625"