Pontiac 389 400 455 215cc 72cc Ram Air Aluminum Bare Cylinder Head
Details
| Brand: | Speedmaster |
| Part Number: | PCE281.1800 |
| 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: | Sold individually. |
| Calculator | Compression Calculator |
| Note: | Valve guides on these heads must be reamed to 11/32" to accept the recommended valves. Recommended valves PCE273.1074 - Intake and PCE273.1075 - Exhaust. |
Speedmaster 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. CNC Ported heads in this application will soon be available. Speedmaster CNC ported cylinder heads are machined on dedicated 4-axis and 5-axis CNC machining centers to ensure accuracy and cost effectiveness. On the CNC ported versions, combustion chamber, Exhaust and Intake Ports all fully CNC machined for better flow. CNC combustion chambers offer superior control over flame travel and quench area. CNC Ported heads eliminate human error and variation from port to port. Unsurpassed repeatability from one cylinder head to another that is commonly found in "Hand porting & Polishing" Combustion chambers are exact in volume - so every cylinder has the same compression ratio. Each port is the same cross section - so every cylinder can reach higher true RPM potential. CNC machining produces ports and chambers to within tolerances of no more than .002"; in turn every cylinder can reach the same power potential and accurate tuning. HEAD GASKETS The head gasket we recommend for our Pontiac heads is Felpro #10171. (4.540 Bore) or Fel Pro#1016 (4.300 Bore) INTAKE GASKETS Our heads are manufactured with the Ram Air IV pattern which requires Felpro #1233 gaskets. PUSH RODS Please measure for exact pushrod length once heads and rockers are fully installed. Deck machining, head gasket thickness and rocker arm style will all affect pushrod height. SPARK PLUGS All Speedmaster Pontiac heads use standard 14mm. x 750" reach, 5/8 hex, gasket seat sparkplugs like NGK R5671A-7, Autolite 3924, Champion RC12YC, etc. Remember that higher compression/ boost require a colder heat range sparkplug. HEAD BOLTS / STUDS Our Pontiac heads utilize standard Ram Air Iv head bolts or studs.The ARP head bolt part number is 190-3605. EXHAUST GASKETS We recommend the use of Edelbrock exhaust gaskets #7281 or any comparable item of your choice.