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ProMaxx Performance 2121

ProMaxx Performance 225cc Aluminum Cylinder Heads Small Block Chevy

723-2121

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Save $20 Off $250, $50 Off $500, $100 Off $1,000, $150 Off $2,000. Promo Code: SAVEMORE exclusions apply

$859.99
ProMaxx Performance 225cc Aluminum Cylinder Heads Small Block Chevy $859.99
Out of stock
2 left in stock
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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

    Specifications:

    Quantity
    Sold as a pair
    Cylinder Head Style
    Assembled
    Guideplates Included
    Yes
    Rocker Arm Studs Included
    Yes
    Accessory Bolt Holes Drilled
    Yes
    Cylinder Head Finish
    Natural
    Cylinder Head Material
    Aluminum
    CNC-Machined Combustion Chamber
    No
    CNC-Machined Exhaust Runner
    No
    CNC-Machined Intake Runner
    No
    Damper Spring Included
    Yes
    Exhaust Valves Included
    Yes
    Heat Crossover
    No
    Intake Valves Included
    Yes
    Locks Included
    Yes
    Machined for O-Ring
    No
    Retainers Included
    Yes
    Rocker Arm Nuts Included
    No
    Rocker Arms Included
    No
    Steam Holes Drilled
    No
    Valve Guides Included
    Yes
    Valve Seats Machined
    Yes
    Valve Springs Included
    Yes
    Valve Stem Seals Included
    Yes
    Combustion Chamber Volume (cc)
    64
    Intake Port Location
    Standard
    Exhaust Port Location
    Standard
    Oiling Style
    Through pushrod
    Intake Valve Diameter (in.)
    2.08
    Exhaust Valve Diameter (in.)
    1.6
    Valve Guide Material
    Manganese bronze
    Intake Runner Volume (cc)
    225
    Valve Seat Material
    Ductile iron
    Valve Cover Mounting Style
    Perimeter bolt
    Valve Seat Machine Style
    5-angle
    Exhaust Runner Volume (cc)
    70
    Outside Diameter of Outer Spring (in.)
    1.27
    Maximum Valve Lift (in.)
    0.575
    Retainer Material
    Steel
    Lock Style
    Stock
    Spark Plug Style
    Straight
    Manufacturer's Part Number:
    2121
    Shipping Weight:
    53.5
    Package Height:
    12
    Package Depth:
    24.6
    Package Width:
    9.3

    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

    JEGS EZ Kits are designed by JEGS professionals to ensure that you get all the correct parts you need.

  • would-these-heads-work-will--on-a-383-with-a-530-lift-hyd-roller-----thank-you-

    Asked by: prodad
    These heads will work, but the valve springs should be changed to accommodate the hydraulic roller camshaft.
    Answered by: Rusty B
    Date published: 2018-10-08

    Can i use a 268 extreme energy cam on a chevy 350 with the head?

    Asked by: South 71
    The 268 cam will be fine for these heads.
    Answered by: Jon Jegs Tech
    Date published: 2018-02-22

    What would be the best roller cam to go with these heads 

    Asked by: Chris135664322225667
    The spring package in that cylinder head is designed for flat tappet cams only
    Answered by: SteveM
    Date published: 2017-12-12
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    • loc_en_US, sid_10001_10001_1150780, prod, sort_[SortEntry(order=LAST_APPROVED_ANSWER_SUBMISSION_TIME, direction=DESCENDING)]
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