Brand:
PROMAXX Performance
Manufacturer's Part Number:
Part Type:
Cylinder Heads
Product Line:
PROMAXX Performance Freedom Series Big Block Chevy Cylinder Heads
Combustion Chamber Volume (cc):
119
Intake Runner Volume (cc):
320cc
Cylinder Head Style:
Assembled
Cylinder Head Material:
Cast aluminum
Camshaft Style:
Hydraulic roller
Intake Port Shape:
Rectangular
Intake Valve Diameter (in.):
2.250 in.
CNC-Machined Combustion Chamber:
No
CNC-Machined Intake Runner:
No
CNC-Machined Exhaust Runner:
No
Intake Port Location:
Standard
Exhaust Port Shape:
D-port
Exhaust Port Location:
Raised
Intake Valves Included:
Yes
Exhaust Valves Included:
Yes
Exhaust Valve Diameter (in.):
1.880 in.
Valve Springs Included:
Yes
Maximum Valve Lift (in.):
0.600 in.
Damper Spring Included:
No
Number of Springs Per Valve:
Dual
Retainers Included:
Yes
Retainer Material:
Steel
Locks Included:
Yes
Lock Style:
7 degree
Valve Stem Seals Included:
Yes
Rocker Arm Studs Included:
Yes
Rocker Arm Nut Thread Size:
7/16 in.-20
Rocker Arms Included:
No
Rocker Arm Nuts Included:
No
Guideplates Included:
Yes
Guideplate Pushrod Size:
3/8 in.
Valve Cover Mounting Style:
Perimeter bolt
Accessory Bolt Holes Drilled:
Yes
Valve Guides Included:
Yes
Valve Guide Material:
Manganese bronze
Valve Seats Machined:
Yes
Valve Seat Machine Style:
5-angle
Valve Seat Material:
Ductile iron
Cylinder Head Color:
Natural
Steam Holes Drilled:
No
Oiling Style:
Through pushrod
Machined for O-Ring:
No
Heat Crossover:
No
Remanufactured:
No
Quantity:
Sold as a pair.
PROMAXX Performance Freedom Series Big Block Chevy Cylinder Heads
These assembled PROMAXX 320 BBC aluminum cylinder heads for 1966-2000 big block Chevy V8 engines will help you shave weight on a budget. These PROMAXX Performance Freedom Series rectangular port 320cc intake runners with hand-blended valve bowls are good for the street or strip. They will help you make power above 3,500 rpm without killing your low-end grunt. These heads include stainless-steel 2.250 in. intake and 1.880 in. exhaust valves with a five-angle valve job in the 119cc combustion chambers. Bronze valve guides, 7/16 in. screw-in rocker arm studs and guide plates for ⅜ in. pushrods will help keep your valvetrain in line. The dual valve springs are good for up to 0.600 in. lift.
