Speedmaster Pontiac Round Port 87cc Ram Air Aluminum Bare Cylinder Heads, Set/2

Part Type: Cylinder Heads Cylinder Head Style: Bare Cylinder Head Material: Aluminum Cylinder Head Finish: Natural Combustion Chamber Volume (cc): 87 cc CNC-Machined Combustion Chamber: No Intake Runner Volume (cc): 215cc Exhaust Runner Volume (cc): 175cc CNC-Machined Intake Runner: No CNC-Machined Exhaust Runner: No Intake Port Shape: Ram Air IV Intake Port Location: Standard Exhaust Port Shape: Ram Air IV Exhaust Port Location: Standard Spark Plug Style: Standard Comp. Valve Job: No Intake Valves Included: No Intake Valve Diameter (in): 2.11 in. Exhaust Valves Included: No Exhaust Valve Diameter (in): 1.660 in. Valve Springs Included: No Damper Spring Included: No Retainers Included: No Locks Included: No Valve Stem Seals Included: No Rocker Arm Studs Included: No Rocker Arms Included: No Rocker Arm Nuts Included: No Guideplates Included: No Valve Cover Mounting Style: Perimeter Bolt Accessory Bolt Holes Drilled: Yes Intake Valve Angle: 14 deg. Exhaust Valve Angle: 14 deg. Valve Guides Included: Yes Valve Guide Material: Bronze Valve Seats Machined: No Valve Seat Machine Style: N/A Valve Seat Material: Ductile iron Steam Holes Drilled: No Oiling Style: Through pushrod Machined for O-Ring: No Heat Crossover: No Quantity: Set of 2 heads Calculator Compression Calculator Note: Valve guides on these heads must be reamed to 11/32" to accept the recommended valves. Pontiac heads include valve sizes at 2.11" Intake, and 1.66" While the 2.11" valves are standard issue, the valve seat can be machined to accept a larger valve with minimal work.