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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 2.250"/1.800" stainless steel valves, HP valve springs (dual 1.500" hydraulic roller up to .600" lift), 7/16" screw-in studs and guide plates.
Part Type: Cylinder Head
Application: Chevrolet Big Block
Cylinder Head Material: Aluminum
Bare or Assembled: Bare
Combustion Chamber Size: 119cc
CNC Machined Combustion Chambers: No
Intake Valve Angle: 26
Exhaust Valve Angle: 26
Intake Port Volume: 317cc
CNC Machined Intake Port: No
Intake Port Flow:
Intake Port Location: Standard
Intake Port Shape: Rectangular
Intake Port Dimensions:
Suggested Intake Gaskets:
Exhaust Port Volume:
CNC Machined Exhaust Port: No
Exhaust Port Flow:
Exhaust Port Location: Raised .375
Exhaust Port Shape: D-shaped
Exhaust Port Dimensions:
Suggested Exhaust Gaskets:
Spark Plug Style:
Suggested Spark Plug:
Valve Guides: Yes
Valve Guide Spacing:
Valve Stem Diameter:
Valve Seats: Yes
Valve Job:
Intake Valve Diameter: 2.250"
Intake Valve Included: Yes
Exhaust Valve Diameter: 1.880"
Exhaust Valve Included: Yes
Suggested Valve Length:
Valve Spring Pockets:
Valve Springs Included: Yes, 1.500" Single with Damper
Valve Spring Application: Hydraulic Roller, .600" max lift
Valve Springs Retainers Included: Yes
Valve Locks Included: Yes
Valve Seals Included: Yes
Rocker Studs Included: Yes
Guide Plates Included: Yes
Valve Cover Mounting Style: Perimeter bolt
Steam Holes Drilled: No
Heat Crossover: No
Suggested Head Bolts:
Suggested Head Studs:
Suggested Stud Girdle:
Head Bolt Torque with Oil: 65 ft./lbs. (short bolts) 75 ft./lbs. (long bolts)
Rocker Stud Torque with Oil: 45 ft./lbs.
Intake Bolt Torque with Oil:
Manufacturer: ProMaxx Performance
Manufacturer's Part Number: 9318
Weight:
Warranty: Race Application, No warranty expressed or implied
Quantity: Sold as Pair
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