FLOTEK 290-6058 Features:

FLOTEK's 290cc big block Chevy cylinder heads with 112cc combustion chambers are recommended for moderate street or street/strip BBCs with displacements up to 509 cu. in. operating at or below 6,500 rpm. It may be necessary to check clearance and slightly modify some domed aftermarket pistons due to the efficient heart-shaped combustion chamber on these heads (most of the newer designed dome profiles will clear). FLOTEK recommends removing material from the piston and not the cylinder head, as the combustion chamber shapes are very critical to flow—altering the cylinder head can unfavorably affect flow and power performance. FLOTEK's medium-sized 290cc oval port cylinder heads are designed for 3/8 in. pushrods with 0.120 in. wall thickness. Note: Cylinder heads are sold individually.

Specifications:

• Combustion Chamber Volume (cc): 112
• Intake Runner Volume (cc): 290cc
• Exhaust Runner Volume (cc): 135cc
• Cylinder Head Style: Assembled
• Cylinder Head Material: Cast Aluminum
• Camshaft Style: Solid Roller
• Intake Port Shape: Oval
• Intake Valve Diameter (in.): 2.300 in.
• CNC-Machined Combustion Chamber: No
• CNC-Machined Intake Runner: No
• CNC-Machined Exhaust Runner: No
• Combustion Chamber Style: Heart
• Intake Port Location: Standard
• Exhaust Port Shape: Oval
• Exhaust Port Location: Raised
• Spark Plug Style: Angle
• Intake Valves Included: Yes
• Exhaust Valves Included: Yes
• Exhaust Valve Diameter (in.): 1.880 in.
• Valve Springs Included: Yes
• Maximum Valve Lift (in.): 0.750 in.
• Outside Diameter of Outer Spring: 1.620 in.
• Damper Spring Included: Yes
• Number of Springs Per Valve: Dual
• Retainers Included: Yes
• Retainer Material: Chromoly Steel
• Locks Included: Yes
• Lock Style: 7 Degree
• Valve Stem Seals Included: Yes
• Valve Stem Seal Style: Positive Stop
• 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
• Intake Valve Angle: 24/4
• Exhaust Valve Angle: 15/4
• Valve Guides Included: Yes
• Valve Guide Material: Manganese Bronze
• Valve Seats Machined: Yes
• Valve Seat Machine Style: 3-Angle
• Valve Seat Material: Powdered Metal
• Cylinder Head Finish: Natural
• Steam Holes Drilled: No
• Oiling Style: Through Pushrod
• Machined for O-Ring: No
• Heat Crossover: No
• Remanufactured: No
• Quantity: Sold Individually

Emissions Note:

This part is only legal for sale and use on Uncontrolled (Non-Emissions Controlled) Vehicles or on vehicles used solely for the purposes of closed competition racing.

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