Product Details
Aluminum Complete Cylinder Heads by Speedmaster®. 2 Pieces. Combustion Chamber Volume 68 cc. Intake Runner Volume: 190 cc. Competition Valve Job: No. Spark Plug Style: Standard. Cylinder Head Material: Aluminum. As with all Speedmaster cylinder heads, Speedmaster 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 Speedmaster PCE281.1489 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 rectangle port PCE281.1488 heads. The mid-size cross section works well on engines under 540cu.in and under 7000RPM. If you are working on a larger, or higher RPM engine, step up to the CNC ported PCE281.1511 heads. The added volume of the PCE281.1511 intake ports (360cc) helps to fill in the gap between As-Cast performance heads and All-Out racing heads. If you're looking for 750+hp the PCE281.1523 with their competition valve job fit the bill perfectly.
Features
- Created by professionals to meet your requirements
- Superior longevity and dependability
- Expertly Crafted using premium-grade materials
Head Gaskets
Due to the wide combustion chamber needed to fit around the large 2.202/ 1.620 valves, they recommend Felpro 1008 gaskets will also work with these head/ block combos.
Intake Gaskets
The PCE281.1488 heads work well with Speedmaster 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
Speedmaster 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 Speedmaster heads, +.100 longer bolts / studs are needed next to each port. Use Speedmaster PCE279.1017 head stud Kit.
Please consult your fastener manufacturer for their specific recommended torque values.
.Founded in 1979, Speedmaster® has become a leader in its field, built on a long term consistency of being a specialist in aftermarket automotive components. It began as a small speed workshop building engines for customers as a hobby, and now the company has grown from a one-man bricks-and-mortar business into a worldwide high-performance powerhouse known for assembling, manufacturing and racing high-performance engine parts. Speedmaster’s mission is to push innovation boundaries to create visually distinctive DNA, by blending old and new technology into functionality and aesthetics. Its empowered work forced drives innovation not only in the products it makes but with the way it goes about doing it. The ultimate token of precision, Speedmaster is the world’s only major parts manufacturer to equip cars from Standard replacement to Top Fuel Dragsters. Surviving the longevity of road, race and recreation is mandatory for all Speedmaster “Track Proven” products, bringing you closer to product perfection.