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Mopar Chrysler SB 318 360 170cc 65cc Hydr-R Complete Aluminum Cylinder Heads

SKU: PCE281.2149


Part Number: PCE281.2149
Part Type:Cylinder Heads
Cylinder Head Style:Assembled
Cylinder Head Material:Aluminum
Cylinder Head Finish:Natural
Combustion Chamber Volume (cc): 65 cc
CNC-Machined Combustion Chamber:No
Intake Runner Volume (cc): 170 cc
Exhaust Runner Volume (cc): n/a
CNC-Machined Intake Runner: No
CNC-Machined Exhaust Runner: No
Intake Port Shape: Rectangular
Intake Port Location: Standard
Exhaust Port Shape: OEM
Exhaust Port Location: Standard
Spark Plug Style: OEM
Comp. Valve Job: No
Intake Valves Included: Yes
Intake Valve Diameter (in): 2.202 in.
Exhaust Valves Included: Yes
Exhaust Valve Diameter (in): 1.600 in.
Valve Springs Included: Yes
Maximum Valve Lift (in): 0.600 in.
Outside Diameter of Outer Spring (in):1.250 in.
Damper Spring Included:Yes
Number of Springs Per Valve:Dual
Retainers Included:Yes
Retainer Material:Chromoly steel
Locks Included:Yes
Lock Style:10 degree
Valve Stem Seals Included:Yes
Valve Stem Seal Style:Positive stop
Rocker Arm Studs Included: No 
Rocker Arms Included: No 
Rocker Arm Nuts Included: No 
Guideplates Included: No 
Valve Cover Mounting Style: Center & Perimeter Bolt
Accessory Bolt Holes Drilled: Yes 
Intake Valve Angle: 18 deg.
Exhaust Valve Angle: 18 deg.
Valve Guides Included: Yes 
Valve Guide Material: Bronze 
Valve Seats Machined: Yes
Valve Seat Machine Style: 3-angle
Valve Seat Material: Ductile iron 
Steam Holes Drilled: No
Oiling Style: Through pushrod 
Machined for O-Ring: No 
Heat Crossover: No
Quantity:Sold as a pair.
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Assembly Specifications
Max Lift: .600
Coil Bind: .1.150
Intake Install: 135lbs @ 1.8
Exhaust Install: 135lbs @ 1.8
Closed Sear Pressure: 135lbs
Open Seat Pressure: 325lbs

As with all Speedmaster cylinder heads, our Small Block Chrysler heads are _Gravity Die Cast_. This casting process creates a much more uniform and robust cylinder head. With the increasingly large displacements becoming common, the need for more airflow is necessary. If you are looking to build a 400-500+hp engine, give our PCE281.1654 heads a try. They offer a smaller cross - section to increase the incoming air_s velocity, resulting in great driveability, power and economy. On engines over 500hp, use the CNC Ported PCE281.1656 heads. The mid-size cross section works well on larger displacement engines and in and under 7000RPM. If you_re looking for more horsepower the PCE281.1658 with their competition valve job fit the bill perfectly.

Due to the wide combustion chamber needed to fit around the large 2.202/ 1.620_ valves, we recommend Felpro 1008 gaskets will also work with these head/ block combos. .

The PCE281.1488 heads work well with our PCE349.1010 rectangle port gaskets. If you prefer Felpro gaskets, these Chrysler heads take a 1213 gasket, depending on the thickness you require.

Our heads require the use of 14mm. x 3/4_ reach 5/8_ hex gasket seat sparkplugs. Some recommended plugs are; NGK BCPR6ES or R5671A-7, Champion RC12YC, Autolite AR3923 or AR3924. Remember these are for mild street engines. Higher compression or boost requires colder sparkplugs!

Due to the raised (+.625_) exhaust port location on our heads, +.100_ longer bolts / studs are needed next to each port. Use our PCE279.1017 head stud Kit.

Please consult your fastener manufacturer for their specific recommended torque values.