FLOTEK 390-500 Features:

FLOTEK introduces the Jailbird 390cc CNC big block Chevy cylinder heads. With CNC porting to offer superior performance, the Jailbird 390 will deliver for larger cubic inch engines of 565-640, allowing aggressive cam profiles to make maximum power. Touting an impressive 467 cfm at .900 lift with professional bowl blending and a competition 6-angle valve job to release its full potential, this is the right head for you! Also offered as CNC without bowl blending, the Jailbird 390 produces 436 cfm at .700 lift with 4.625 in. bore fixture and 426 cfm on 4.50 in. bore fixture. Either way, you can't go wrong with the FLOTEK Jailbird 390—a perfect choice for Power Header, Nitrous Super Charge, Jacks, and Boosts. Note: Cylinder heads are sold individually.

Specifications:

• Combustion Chamber Volume (cc): 133
• Intake Runner Volume (cc): 390cc
• Exhaust Runner Volume (cc): 135cc
• Cylinder Head Style: Bare
• Cylinder Head Material: Cast Aluminum
• Intake Port Shape: Rectangular
• Intake Valve Diameter (in.): 2.375 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: Oval
• Exhaust Port Location: Raised
• Spark Plug Style: Angle
• Intake Valves Included: No
• Exhaust Valves Included: No
• Exhaust Valve Diameter (in.): 1.850 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 Arm Nut Thread Size: 7/16 in.-20
• Rocker Arms Included: No
• Rocker Arm Nuts Included: No
• Guideplates Included: Yes
• Guideplate Pushrod Size: 5/16 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: 6-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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