Proflow Cylinder Heads, LS SuperMax-B 260, Aluminium Bare Cylinder Heads, (6-Bolt) LS3/L76/L77/L92/L98/LSX, 260cc Intake, 70cc Chamber, , 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 Combustion Chamber 70 cc Intake Port Volume 260 cc Intake Port Dimensions 2.62” (H) x 1.31” (W) Exhaust Port Volume 104 cc Exhaust Port Dimensions 1.70” (H) x 1.815” (W) Spark Plug Location OEM Intake Valve Diameter 2.165” Exhaust Valve Diameter 1.60” Valve Stem Diameter 8 mm Valve Spring Pocket ID 1.64” Valve Guide OD 0.502” (0.560” at base) Maximum Valve Lift 0.750” Rocker Stud Thread Size OE LS3 Style Valve Angle 11° Deck Thickness 0.750”