FREE SHIPPING & HANDLING!*                           Order by 11 PM EST for Same Day Shipping!

ProMaxx Performance 2121 - Patriot Performance SB-Chevy 225CC Freedom Series Heads

ProMaxx Performance 2121 - Patriot Performance SB-Chevy 225CC Freedom Series Heads

ProMaxx Performance#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 - Patriot Performance SB-Chevy 225CC Freedom Series Heads

    Patriot Performance expanded the Freedom Series heads to include their newest 225cc runner. To achieve the best flowing cylinder heads Patriot performs their 2.08''/1.60'' 5-angle valve job, hand blend the valve bowl area, and mill to exact tolerances. To this they add only the highest quality EV8 2.08''/1.60'' stainless valves, .575'' lift (hyd. flat tappet) springs, steel retainers, 3/8'' studs, bronze guides, and guide plates. These heads are a great addition to engine builds that are 383ci and larger.

    Note: Due to high intake runner position, most intakes will require 1/8" thick Fel Pro 1266 gasket.



    Technical Specs:
    Combustion Chamber: 64cc
    Intake Runner: 225cc
    Exhaust Runner: 62cc
    Intake Valve: 2.02'' or 2.08''
    Exhaust Valve: 1.60''
    Max. Valve Spring Lift: 0.575''
    Spring Pressure Closed: 115 lbs. @ 1.800''
    Spring Pressure Open: 310 lbs. @ 1.225''
    Retainer Material: Steel
    Valve Seal Material: Viton
    Valve Guide Material: Manganese Bronze
    Valve Job: 5-angle
    Uses .750 reach gasket seat spark plugs (Autolite 410-AR3924 Suggested)

    JEGS Performance Products 80521 - JEGS Premium Stud Mount Valve Spring Compressor Tool
    Only $48.99

    JEGS Performance Products 80524 - JEGS Top Dead Center Locator
    Only $9.99

    JEGS Performance Products 80518 - JEGS Stud Mount Valve Spring Compressor Tool
    Only $25.99

    JEGS Performance Products 80900 - JEGS Port and Polish Kit
    Only $34.99


    See All Items You Need