Chevy BBC 454 360cc 125cc Full CNC Aluminum Bare Cylinder Heads (Pair)


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SKU: SM-281.1511 Categories: , ,


360cc BIG BLOCK CHEVY, BARE, Aluminum Cylinder Heads


Aircraft Grade 356A T-6 Aluminum Alloy, CNC Ported

125cc Combustion Chamber,  360cc Intake Runners

Fits All OEM Bolt Pattern Manifolds, Intake Head Bolt Standard OEM Length

8 Bolt Exhaust Flange, Square Port Exhaust, 15/24 Degree Valve Angle

Manganese Bronze Valve Guides

3 Angle Cut Stellite Valve Seats

Takes Felpro 1275 bigger gasket set, Felpro 1047 Head Gasket

Uses Felpro # 1275 Rectangular Port Intake Gasket

65 Torque Specs,  Suggested Roller Cam Base of 1.130″

Max Lift: 650

Mfg for an 8005 Single Spring w/dampner,   springs are designed for big block motors that require a 1.5250 outer diameter spring. Springs are desigend for street/strip applications with cam combination with no more than .650 lift. Spring pressures and installed heights are as follows.
140lbs at 1.900 165lbs at 1.850 180lbs at 1.800 350lbs at 1.300 365lbs at 1.250 380lbs at 1.200 Coil bind at 1.160

Installed spring height should be checked with your camshaft specs of your application.

Flow Test Data @28″ CFM Water Intake (according to manufacturer)

These heads fit years from 1955 to 2009
the difference is gen4-5-6 blocks

Due to the wide combustion chamber needed to fit around the large 2.250/ 1.880″ valves, we recommend our PCE348.1004 MLS head gaskets.
To install our BBC heads on Mark V blocks, you will need to use our SM5233L and SM5233R Elite Series MLS head gaskets. Alternatively, you can use Victor Reinz # 4918(R) & #4923(L) head gaskets on Mark V blocks with our heads.

LIFT 100 200 300 400 500 600 700 800 900
INTAKE 70.2 145.7 220.4 280.3 328.6 363.4 389.4 404.3 410.1
EXHAUST 62.6 123.4 169.0 209.9 245.0 363.4 292.7 310.6 321.1

Additional information

Weight 60 lbs
Dimensions 22 × 20 × 18 in

Cylinder Heads

Vehicle Make



Big Block


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