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ProMaxx Performance Shocker 225 Full CNC Ported Aluminum Chev SB Cylinder Heads
The professional designed CNC port flows like the top brands in the industry; over 320 cfm. Compare flow numbers and then look at the price. Made right here in the USA using Grade A 356-T6 aluminum and custom 5 axis CNC machining. 5 angle competition valve job, diamond honed bronze guides, and hand bowl blending. Fully CNC intake ports, exhaust, and combustion chambers.
Assemblies Include: 2.080"/1.600" stainless steel valves, performance valve springs (1.450" hyd. roller up to .600" lift), 3/8" screw-in studs, and guide plates.
Part Type: Cylinder Head
Application: Chevrolet Small Block
Cylinder Head Material: Aluminum
Bare or Assembled: Assembled
Combustion Chamber Size: 64cc
CNC Machined Combustion Chambers: Yes
Intake Valve Angle: 23
Exhaust Valve Angle: 23
Intake Port Volume: 225cc
CNC Machined Intake Port: Yes
Intake Port Flow: 326 cfm @ .800" Lift / 28"
Intake Port Location: Standard
Intake Port Shape: Rectangular
Intake Port Dimensions:
Suggested Intake Gaskets:
Exhaust Port Volume: 72cc
CNC Machined Exhaust Port: Yes
Exhaust Port Flow: 238 cfm @ .800" Lift/ 28"
Exhaust Port Location: Standard
Exhaust Port Shape: Square
Exhaust Port Dimensions:
Suggested Exhaust Gaskets:
Spark Plug Style: Straight
Suggested Spark Plug: .750" Reach
Valve Guides: Yes (Diamond Honed Bronze)
Valve Guide Spacing: OEM
Valve Stem Diameter: 11/32" (.3415")
Valve Seats: Yes (Hardened Steel)
Valve Job: 5-Angle
Intake Valve Diameter: 2.080"
Intake Valve Included: Yes
Exhaust Valve Diameter: 1.600"
Exhaust Valve Included: Yes
Suggested Valve Length:
Valve Spring Pockets:
Valve Springs Included: Yes, 1.450"
Valve Spring Application: Hydraulic Roller, .600" lift
Valve Springs Retainers Included: Yes (Chrome Moly)
Valve Locks Included: Yes
Valve Seals Included: Yes (Viton)
Rocker Studs Included: Yes (3/8")
Guide Plates Included: Yes
Valve Cover Mounting Style: Perimeter
Steam Holes Drilled: No
Heat Crossover: No
Suggested Head Bolts: ARP 134-3601
Suggested Head Studs:
Suggested Stud Girdle:
Head Bolt Torque with Oil: 80 ft./lbs.
Rocker Stud Torque with Oil:
Intake Bolt Torque with Oil:
Manufacturer: ProMaxx
Manufacturer's Part Number: 9225
Weight: 55 lbs.
Warranty: Race Application, No warranty expressed or implied
Quantity: Sold as Pair
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