Maximum competition. High torque, high compression, low dome. 8,000+ RPM, 500+ cubic inches.
Race Series big block 18?ø oval port heads bridge the gap between conventional heads and Dart??s Big Chief heads.
Utilizing Pro Stock style oval intake ports with 330cc or 383cc runners in a conventional asymmetrical port design, and featuring an 18?ø rolled valve angle with redesigned shallow combustion chambers, this design is ideal for drag racing, marine applications and dirt modified classes permitting big blocks.
- Cylinder Head Style:
- Bare
- Cylinder Head Material:
- Cast aluminum
- Cylinder Head Finish:
- Natural
- CNC-Machined Combustion Chamber:
- Yes
- Combustion Chamber Volume (cc):
- 102cc
- Combustion Chamber Style:
- Heart
- CNC-Machined Intake Runner:
- Yes
- Intake Runner Volume (cc):
- 383cc
- Intake Port Shape:
- Oval
- Intake Port Location:
- Raised 0.400 in.
- Intake Valve Angle:
- 18 Degree
- CNC-Machined Exhaust Runner:
- Yes
- Exhaust Runner Volume (cc):
- 152cc
- Exhaust Port Shape:
- Oval
- Exhaust Port Location:
- Raised 0.400 in.
- Exhaust Valve Angle:
- 9 degree
- Intake Valves Included:
- No
- Intake Valve Diameter (in.):
- 2.350 in.
- Exhaust Valves Included:
- No
- Exhaust Valve Diameter (in.):
- 1.840 in.
- Valve Type:
- N/A
- Maximum Valve Lift (in.):
- N/A
- Valve Springs Included:
- No
- Valve Spring Type:
- N/A
- Outside Diameter of Outer Spring (in.):
- 1.740 in.
- Valve Guides Included:
- Yes
- Valve Guide Material:
- Manganese bronze
- Valve Seats Machined:
- Yes
- Valve Seat Material:
- Ductile iron
- Valve Seat Machine Style:
- N/A
- Retainers Included:
- No
- Retainer Material:
- N/A
- Valve Stem Seals Included:
- No
- Valve Stem Seal Style:
- N/A
- Locks Included:
- No
- Lock Style:
- N/A
- Camshaft Style:
- N/A
- Spark Plug Style:
- N/A
- Guideplates Included:
- No
- Guideplate Pushrod Size:
- N/A
- Rocker Arm Studs Included:
- No
- Rocker Arm Nut Thread Size:
- N/A
- Accessory Bolt Holes Drilled:
- Yes
- Valve Cover Mounting Style:
- Perimeter bolt
- Heat Crossover:
- No
- Steam Holes Drilled:
- No
- Oiling Style:
- Through pushrod
- Machined for O-Ring:
- No
- Quantity:
- Sold individually.
- Make:
- Chevrolet
- Engine Family:
- Chevy big block Mark IV
- Engine Sizes:
- 6.5L/396-7.4L/454
- Years:
- 1966-1990
