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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"/1.880" stainless steel valves, HP valve springs (dual 1.550" mechanical roller up to .700" lift), 7/16" screw-in studs and guide plates.
Part Type: Cylinder Head
Application: Chevrolet Big Block
Cylinder Head Material: Grade A 356-T6 Aluminum
Bare or Assembled: Assembled
Combustion Chamber Size: 119cc
CNC Machined Combustion Chambers: No
Intake Valve Angle: 24
Exhaust Valve Angle: 15
Intake Port Volume: 317cc
CNC Machined Intake Port: No
Intake Port Flow: 375.2 cfm @ .800" Lift / 28"
Intake Port Location: Standard
Intake Port Shape: Rectangular
Intake Port Dimensions:
Suggested Intake Gaskets: Fel-Pro 1275 or Equivalent
Exhaust Port Volume: 124cc
CNC Machined Exhaust Port: No
Exhaust Port Flow: 302.9 cfm @ .800" Lift / 28"
Exhaust Port Location: Raised .375"
Exhaust Port Shape: D-Shape
Exhaust Port Dimensions:
Suggested Exhaust Gaskets: Fel-Pro 1412 or Equivalent
Spark Plug Style: .750" Reach, Gasket Seat Plug
Suggested Spark Plug: NGK R5671A-7 or Equivalent
Valve Guides: Manganese Bronze
Valve Guide Spacing:
Valve Stem Diameter: 11/32" (.3415")
Valve Seats: Powdered Metal
Valve Job: 5 Angle
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, 1.550", Dual with Damper
Valve Spring Application: Mechanical Roller, 200lbs. Seat, 600lbs. Open, .700" Max Lift
Valve Springs Retainers Included: Yes
Valve Locks Included: Yes (10 Degree)
Valve Seals Included: Yes
Rocker Studs Included: Yes (7/16”)
Guide Plates Included: Yes
Valve Cover Mounting Style: Perimeter
Steam Holes Drilled: No
Heat Crossover: No
Suggested Head Bolts: ARP 135-3603
Suggested Head Studs: ARP 235-4103 or 235-4303
Suggested Stud Girdle: Howards Cams 90121 or Jomar 1114
Head Bolt Torque with Oil: 80ft/lbs.
Rocker Stud Torque with Oil: 50ft/lbs.
Intake Bolt Torque with Oil: 23ft/lbs..
Manufacturer: ProMaxx Performance
Manufacturer's Part Number: 9319
Weight:
Warranty: Race Application, No warranty expressed or implied
Quantity: Sold as Pair
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