Speedmaster Pontiac Round Port 72cc 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): 72 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
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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.