Brand: Airflow Research (AFR) Manufacturer's Part Number: 1427 Part Type: Cylinder Heads Product Line: AFR 195cc SBF Renegade Competition Cylinder Heads Automotive Fittings Part Number: AFR-1427 Combustion Chamber Volume (cc): 58 Intake Runner Volume (cc): 195cc Exhaust Runner Volume (cc): 70cc Cylinder Head Style: Bare Cylinder Head Material: Cast aluminum Intake Port Shape: Rectangular Intake Valve Diameter (in.): 2.050 in. CNC-Machined Combustion Chamber: Yes CNC-Machined Intake Runner: Yes CNC-Machined Exhaust Runner: Yes Combustion Chamber Style: Heart Intake Port Location: Standard Exhaust Port Shape: Square 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: 20 Exhaust Valve Angle: 20 Valve Guides Included: Yes Valve Guide Material: Manganese bronze Valve Seats Machined: Yes Valve Seat Machine Style: 5-angle intake/3-angle exhaust Valve Seat Material: Ductile iron Cylinder Head Color: Natural Steam Holes Drilled: No Oiling Style: Through head Machined for O-Ring: No Heat Crossover: No Remanufactured: No Quantity: Sold as a pair. Description: Are you building your own personal street/strip weapon? These AFR 195cc SBF Competition cylinder heads are designed for you. To make big horsepower, you need heads that can flow large amounts of air--that's where AFR, the masters of airflow come in. These heads feature a 195cc intake port, 70cc exhaust ports, and your choice of 58 or 72cc combustion chambers to complement your engine. To get the fuel and air in and out efficiently, AFR uses lightweight 8mm 2.050 intake valves and 1.600 exhaust valves. The thick deck makes these heads ideal for nitrous or blower applications with the optional nitrous/blower exhaust port. These heads are most at home on performance engines operating primarily between 2,000 and 7,000 rpm. Dominate the street and strip with the help of AFR and these 195cc SBF Competition cylinder heads.