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ProMaxx Performance 2121 - ProMaxx Performance Small Block Chevy Aluminum Cylinder Heads



ProMaxx Performance 2121 - ProMaxx Performance Small Block Chevy Aluminum Cylinder Heads
ProMaxx Performance 2121 - ProMaxx Performance Small Block Chevy Aluminum Cylinder Heads

JEGS Part Number: 723-2121

225cc Aluminum Cylinder Heads
  • Small Block Chevy
  • 2.08''/1.60'' Valves
  • 225cc Intake Runner
  • 64cc Combustion Chamber
  • Straight Plug
  • Assembled
  • Sold as pairs

    ProMaxx Performance 2121 Details

    225cc Aluminum Small Block Chevy Cylinder Heads

    Technical Specifications and Recommended Components:
    Combustion Chamber - 64cc
    Weight - 55.00 lbs
    Intake Runner - 225cc
    Exhaust Runner - 62cc
    Intake Valve Size - 2.08"
    Exhaust Valve Size - 1.60"
    Max. Valve Spring Lift - .575" Hydraulic Flat Tappet
    Spring Pressure - Closed 115 lbs. @ 1.800", Open 315 lbs. @ 1.225"
    Valve Seal Material - Viton
    Valve Guide - Manganese Bronze
    Retainer Material - Steel
    Valve Job - 5-angle
    Head Bolts - ARP 070-134-3601
    Valve Spacing - OEM
    Valve Seats - Hardened Steel
    Intake Gasket - Fel-Pro 375-1206 or 375-1266
    Exhaust Gasket - Fel-Pro 375-1405
    Head Gasket - Fel-Pro 375-1004 or 375-1094
    Spark Plug - 750" Reach Gasket Seat

    ProMaxx Performance Small Block Chevy Aluminum Cylinder Heads

    The ProMaxx Performance Small Block Chevy Cylinder Heads are manufactured from cast aluminum and are offered with straight or angled spark plug ports, a variety of intake port runner, combustion chamber and valve sizes to work on all of your performance engine builds from mild to wild!

    Features
  • All New Parts and Castings
  • Accepts Perimeter Bolt Valve Covers
  • Stainless Steel Valves
  • 3/8" Screw-In Studs and Guideplates
  • Sold In Pairs
  • Assembled in the USA

  • ProMaxx Performance 2121

    Accessory Bolt Holes Drilled
    Yes
    Calculator
    Compression Calculator
    CNC-Machined Combustion Chamber
    No
    CNC-Machined Exhaust Runner
    No
    CNC-Machined Intake Runner
    No
    Combustion Chamber Volume (cc)
    64
    Cylinder Head Finish
    Natural
    Cylinder Head Material
    Aluminum
    Cylinder Head Style
    Assembled
    Damper Spring Included
    Yes
    Exhaust Port Location
    Standard
    Exhaust Port Shape
    Square
    Exhaust Runner Volume (cc)
    70
    Exhaust Valve Diameter (in.)
    1.6
    Exhaust Valves Included
    Yes
    Guideplates Included
    Yes
    Heat Crossover
    No
    Intake Port Location
    Standard
    Intake Runner Volume (cc)
    225
    Intake Valve Diameter (in.)
    2.08
    Intake Valves Included
    Yes
    Lock Style
    Stock
    Locks Included
    Yes
    Machined for O-Ring
    No
    Maximum Valve Lift (in.)
    0.575
    Oiling Style
    Through pushrod
    Outside Diameter of Outer Spring (in.)
    1.27
    Quantity
    Sold as a pair
    Retainer Material
    Steel
    Retainers Included
    Yes
    Rocker Arm Nuts Included
    No
    Rocker Arm Studs Included
    Yes
    Rocker Arms Included
    No
    Spark Plug Style
    Straight
    Steam Holes Drilled
    No
    Valve Cover Mounting Style
    Perimeter bolt
    Valve Guide Material
    Manganese bronze
    Valve Guides Included
    Yes
    Valve Seat Machine Style
    5-angle
    Valve Seat Material
    Ductile iron
    Valve Seats Machined
    Yes
    Valve Springs Included
    Yes
    Valve Stem Seals Included
    Yes
    Manufacturer's Part Number:
    2121
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