Serious horsepower for your Big Block Chevy engine, heads sold individually.Perfect for high performance street/strip, racing, and marine big block Chevy engines, Trick Flow PowerPort® 320 cylinder heads deliver exceptional mid- to high-rpm performance. The Fast As Cast® rectangular runners flow almost as much air as fully CNC-ported heads right out of the box. That means you'll get almost CNC-ported performance for about the same price as regular cast heads.
Efficient heart-shaped combustion chambers have CNC profiled bowl blended valve seat transitions to promote high velocity and huge airflow volume, plus 24 degree valve angles with 4 degree side cants to further increase airflow.
Other features include premium, high-strength aluminum castings, extra-thick decks and walls for porting, and adjustable guideplates.
Cylinder Head Style: Assembled
Cylinder Head Material: Aluminum
Cylinder Head Finish: Natural
Combustion Chamber Volume (cc): 122
CNC-Machined Combustion Chamber: Yes
Intake Runner Volume (cc): 320cc
Exhaust Runner Volume (cc): 137cc
CNC-Machined Intake Runner: No
CNC-Machined Exhaust Runner: No
Combustion Chamber Style: Heart
Intake Port Shape: Rectangular
Intake Port Location: Standard
Exhaust Port Shape: D-Port
Exhaust Port Location: Raised
Spark Plug Style: Angle
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): 0.700 in.
Outside Diameter of Outer Spring (in): 1.550 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
Rocker Arm Studs Included: Yes
Rocker Arms Included: No
Rocker Arm Nuts Included: No
Rocker Arm Nut Thread Size: 7/16-20 in.
Guideplates Included: Yes
Guideplate Pushrod Size: 3/8"
Valve Cover Mounting Style: Perimeter bolt
Accessory Bolt Holes Drilled: Yes
Intake Valve Angle: 24/4
Exhaust Valve Angle: 15/4
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 individually
Notes:
Designed for mechanical flat tappet camshafts. Exhaust port is raised 0.300 in. over stock.
