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

Description

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

Material: A356 Aluminium
Chamber Chamber: 70cc
Intake Port Volume: 276cc
Intake Port Dimension: 1.285″ x 2.60″
Exhaust Port Volume: 90cc
Exhaust Port Dimension: 1.47″ H x 1.64″ W
Spark Plug Location: OE Stock
Intake Valve Diameter: 2.165″ x 4.89″
Exhaust Valve Diameter: 1.59″ x 4.89″
Valve Stem Diameter: 8mm
Valve Spring Pocket I.D.: 1.30″
Valve Guide Material: Manganese Bronze
Valve Guide O.D.: .502″ (.560″ at base)
Rocker Design: LS3 Rails required
Valve Angle: 15
Deck Thickness: .625″