Proflow does not sacrifice quality for a low price--you get both with our aluminium cylinder heads. The lightweight heads are cast from A-356 aluminium alloy with a large choice of engine, for SB & BB Chevrolet, LS Chev Holden Ford SB 289-351W, 302, 351 Cleveland 2V & 3V & BB FE, and Chrysler SB & BB. They have phosphorous bronze valve guides, and ductile iron valve seats for use with unleaded gas. They're also end-milled and drilled for accessories. The fully assembled heads have stainless steel valves, high performance valve springs, 7 degree valve locks, rocker arm studs, and guideplates. Perfect for your Mild or High performance Hot Rod.


  • Cylinder Head Material: A356.0 Aluminum
  • Exhaust Runner Volume: 72cc
  • Intake Valve Diameter (in): 2.020", 5.010" Length, 1.720" Installed height with 0.56" Shim
  • Exhaust Valve Diameter (in): 1.600", 5.045" Length
  • Maximum Valve Lift (in): 0.575 in.
  • Number of Springs Per Valve: Dual
  • Lock Style: 7 degree
  • Valve Stem Diameter: 11/32"
  • Valve Stem Seal Style: Viton seal
  • Rocker Arm Nut Thread Size: 7/16-24 in.
  • Guide plate Pushrod Size: 5/16 in.
  • Valve Cover Mounting Style: Perimeter bolt
  • Valve Angle: 23 degree
  • Valve Guide Material: Manganese bronze
  • Valve Seat Machine Style: 3-angle
  • Valve Seat Material: Powder Metallurgy
  • Steam Holes Drilled: No/ If required
  • Oiling Style: Through pushrod
  • Valve Spring Style: Standard
  • Outside Diameter of Outer Spring: 1.470 in.
  • Spring install height: 1.720" @ 116 lbs seat pressure
  • Spring Diameter: 1.266"
  • Deck Thickness: 0.533"
Proflow Cylinder Heads, AirMax 200, 535HP, Aluminium, Assembled, 64cc Chamber, Straight Plug, 200cc Intake Runner, SB Chevrolet, Pair Diagram Image