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ProMaxx Performance Maxx 317 Chev BB Aluminum Heads
Made right here in the USA. Taking the affordable performance cylinder head to the next level. 317cc intake runners great for street, street/strip, power tour, or smaller cubic inch competition (427-525ci). Custom designed to meet the demands of the BBC world, while keeping the quality high and the price reasonable. Ultra smooth casting made of Grade A 356-T6 aluminum is precision CNC machined creating the perfect platform for new runner and chamber designs. 5 angle competition valve job, diamond honed bronze guides, hand bowl blending, and assembly by professional builders. Produces out of box performance that outperforms the top brands in the industry. MAXX quality and MAXX performance at minimum pricing - ProMaxx Performance. CNC and larger port versions coming soon.
Assembled with 2.300"/1.800" stainless steel valves, HP valve springs (triple 1.600" mechanical roller up to .800" lift), 7/16" screw-in studs and guide plates.
*Features titanium retainers
Application: Chevrolet Big Block
Cylinder Head Material: Aluminum
Intake Valve Angle: 24
Exhaust Valve Angle: 15
Combustion Chamber Volume: 119cc
CNC-Machined Combustion Chamber: Yes
Intake Runner Volume: 317cc
CNC-Machined Intake Runner: Yes
Intake Port Shape: Rectangular
Intake Port Location: Standard
Exhaust Runner Volume: 124cc
CNC-Machined Exhaust Runner: Yes
Exhaust Port Location: Raised .375"
Exhaust Port Shape: D-shaped
Assembled or Bare: Assembled
Intake Valves Included: Yes
Standard Intake Valve Diameter: 2.300"
Max. Intake Valve Diameter: 2.300"
Exhaust Valves Included: Yes
Standard Exhaust Valve Diameter: 1.800"
Max. Exhaust Valve Diameter: 1.800"
Valve Springs Included: Yes
Valve Spring Seat Diameter: 1.600"
Max. Valve Spring Seat Diameter: 1.600"
Retainers Included: Yes (Titanium)
Locks Included: Yes
Valve Stem Seals Included: Yes
Rocker Arm Studs Included: Yes
Guideplates Included: Yes
Valve Cover Mounting Style: Perimeter
Accessory Bolt Holes Drilled: Yes
Valve Guides Included: Yes
Valve Guide Material: Bronze
Valve Seat Material: Viton
Valve Seats Machined: No
Steam Holes Drilled: No
Heat Crossover: No
Manufacturer: ProMaxx Performance
Manufacturer's Part Number: 9320
Packaged Weight: xx.x lbs.
Warranty: Race Application, No warranty expressed or implied
Quantity: Sold as Pair
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