306-500 Cylinder Head for Big Block Chevy Engines, 320 cc Intake Ports, 133 cc Combustion Chambers [Bare]

Name: 306-500 Cylinder Head for Big Block Chevy Engines, 320 cc Intake Ports, 133 cc Combustion Chambers [Bare]
Brand: FLOTEK CYLINDER HEADS
SKU: 516-306-500
Price: 499.00 USD
Availability: InStock

^$499⁰⁰

Ships on Sep 03, 2026

Lowest Price Guarantee

Big Block Chevy
Bare

Bare Aluminum Cylinder Head

Big Block Chevy

Intake Ports: 320 cc Rectangle

Combustion Chamber: 133 cc

For Intake Valve: 2.250 in.

For Exhaust Valve: 1.880 in.

Sold Individually

FLOTEK 306-500 Features:

FLOTEK 320cc big block Chevy cylinder heads are a powerful addition to your build right out of the box! They feature a thick deck design and high-capacity water jackets, making them a reliable option for street or strip applications. The heads can be used with stock pistons and feature raised valve cover rails (exhaust port location is raised 0.500 in.). FLOTEK 320cc BBC cylinder heads are a great choice for adding horsepower! Note: Cylinder heads are sold individually.

Specifications:

Combustion Chamber Volume (cc): 133
Intake Runner Volume (cc): 320cc
Exhaust Runner Volume (cc): 128cc
Cylinder Head Style: Bare
Cylinder Head Material: Cast Aluminum
Intake Port Shape: Rectangular
Intake Valve Diameter (in.): 2.250 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: No
Exhaust Valves Included: No
Exhaust Valve Diameter (in.): 1.880 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: No
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.

CLICK THIS LINK FOR IMPORTANT CARB & EPA EMISSIONS INFORMATION ABOUT THIS PART

FLOTEK Performance Cylinder Heads for High-Performance Big Block Chevy Engines

FLOTEK Performance Cylinder Heads are premium aftermarket aluminum cylinder heads engineered to boost horsepower, torque, and overall engine efficiency for muscle cars, street builds, and racing applications. Known for excellent airflow design, durable materials, and strong out-of-the-box performance, FLOTEK heads are a popular choice among enthusiasts and builders seeking value and power. Offering a wide range of configurations for popular Big Block Chevy applications, all crafted with quality aluminum and precision castings, these heads feature thoughtful engineering like phosphorous bronze valve guides, high-nickel valve seats, and ports milled and drilled for accessories, delivering improved airflow and combustion. Fully assembled or bare options are available to suit both DIY builders and professionals.

Part TypeCylinder Head

Product LineFLOTEK Chevy Big Block Performance Cylinder Heads

BrandFLOTEK CYLINDER HEADS

Package Height9.0

Package Width11.0

Package Length25.0

Weight39.0 PG

Part CategoryPerformance Parts

Valve Springs IncludedNo

Spark Plug StyleAngle

Cylinder Head MaterialCast Aluminum

Cnc-Machined Intake RunnerNo