Trickflow Ultra 18 Cylinder Heads, Sb Chevy, 250cc Intake, Bare

Take the 18 degree power leap! Ideal for drag and high-rpm circle track racing, Trick Flow® Ultra 18® 250 cylinder heads make serious horsepower right out of the box. In fact, the heads deliver higher airflow numbers than fully prepped 23 degree small block Chevy heads. These heads feature Trick Flow CNC-profiled combustion chambers and CNC Competition Ported runners with a premium high resolution surface finish for maximum flow and performance. The heads accept most current 18 degree intake manifolds, headers, and other components. They require the use of offset shaft-mounted rocker arms and a mechanical roller camshaft with offset intake lifters. Trick Flow® Ultra 18® cylinder heads are available fully assembled or as bare castings and sold individually.
Manufacturer's Part Number: TFS-3181B001-C01 Part Type: Cylinder Heads Product Line: Trick Flow® Ultra 18® 250 Cylinder Heads for Small Block Chevrolet Cylinder Head Style: Bare Cylinder Head Material: Aluminum Intake Valve Diameter (in): 2.150 in. Cylinder Head Finish: Natural Combustion Chamber Volume (cc): 56 CNC-Machined Combustion Chamber: Yes Intake Runner Volume (cc): 250cc Exhaust Runner Volume (cc): 100cc CNC-Machined Intake Runner: Yes CNC-Machined Exhaust Runner: Yes Combustion Chamber Style: Heart Intake Port Shape: Rectangular Intake Port Location: Standard Exhaust Port Shape: Oval Exhaust Port Location: Raised Intake Valves Included: No Exhaust Valves Included: No Exhaust Valve Diameter (in): 1.600 in. Valve Springs Included: No Damper Spring Included: No Retainers Included: No Locks Included: No Valve Stem Seals Included: No Rocker Arm Studs Included: No Rocker Arms Included: No Rocker Arm Nuts Included: No Guideplates Included: No Accessory Bolt Holes Drilled: Yes Intake Valve Angle: 18 Exhaust Valve Angle: 18 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: Requires Jesel or T&D shaft mount rocker arm system, offset 0.550 in. for the intake side and 0.220 in. for the exhaust side. This head will also need special 18 degree intake manifold and custom-built headers.