Chevy BBC 454 360cc 125cc CNC Solid Flat Assembled Cylinder Heads (Pair)


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SKU: SM-281.2037 Categories: , ,


360cc BIG BLOCK CHEVY, Cylinder Heads, Aircraft Grade 356A T-6 Aluminum Alloy, CNC Ported.

Cylinder Head Style: Assembled
Cylinder Head Material: Aluminum
Cylinder Head Finish: Natural
Combustion Chamber Volume (cc): 125 cc
CNC-Machined Combustion Chamber: Yes
Intake Runner Volume (cc): 360 cc
Exhaust Runner Volume (cc): n/a
CNC-Machined Intake Runner: Yes
CNC-Machined Exhaust Runner: Yes
Intake Port Shape: Rectangular
Intake Port Location: Standard
Exhaust Port Shape: Rectangular
Exhaust Port Location: Raised
Spark Plug Style: Angle
Comp. Valve Job: No
Intake Valves Included: Yes
Intake Valve Diameter (in): 2.250 in.
Exhaust Valves Included: Yes
Exhaust Valve Diameter (in): 1.880 in.
Valve Springs Included: Yes
Maximum Valve Lift (in): 0.580 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
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: 24 deg.
Exhaust Valve Angle: 15 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.

Max Lift: .650
Coil Bind: .925
Intake Install: 275lbs @ 2.1
Exhaust Install: 275lbs @ 2.1
Closed Sear Pressure: 210lbs
Open Seat Pressure: 450lbs

Takes Felpro 1275 or 1275-5  Intake gasket set, Felpro 1410  Exhaust Gasket & Felpro 1017 Head Gasket

Head Stud Kit uses +.100″longer bolts

Spark Plug style used are 14mm. x 3/4″ reach 5/8″ hex gasket seatplug.

65 Torque Specs w/Moly Lube,

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.

Flow results as per factory testing.

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 75 lbs
Dimensions 24 × 20 × 10 in

Cylinder Heads


Big Block

Vehicle Make

Chevy, GM


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