| Brand: | Speedmaster |
| 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 |
| Overall Length | 5.051 in. |
| Intake Valves Included: | Yes |
| Intake Valve Diameter (in): | 2.02 in. |
| Exhaust Valves Included: | Yes |
| Exhaust Valve Diameter (in): | 1.60 in. |
| Valve Springs Included: | Yes |
| Maximum Valve Lift (in): | 0.600 in. |
| Outside Diameter of Outer Spring (in): | 1.450 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 |
| Valve Stem Diameter | 11/32 in. |
| 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: | 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. |
| Calculator | Compression Calculator |
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 airs
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.
HEAD GASKETS
Due to the wide combustion chamber needed to fit around the large 2.02/
1.60 valves, we recommend Felpro 1008 gaskets will also work with these
head/ block combos. .
INTAKE GASKETS
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.
SPARK PLUGS
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!
HEAD BOLTS / STUDS
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.