Proflow Cylinder Heads AirMax-B Bare Cylinder Heads,200 535HP Aluminium 64cc Chamber Straight Plug 200cc Intake Runner SB Chevrolet Pair

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.

Specifications for Bare Cylinder Heads

• Cylinder Head Material: A356.0 Aluminum
• Exhaust Runner Volume: 72cc 
• Intake Valve Diameter (in): 2.020" 
• Exhaust Valve Diameter (in): 1.600"
• Valve Stem Diameter: 11/32"
• Valve Angle: 23 degree 
• Valve Guide Material: Manganese bronze 
• Valve Seat Machine Style: 3-angle 
• Valve Seat Material: Powder Metallurgy 
• Valve Spring Style: Standard
• Outside Diameter of Outer Spring: 1.470 in.
• Spring Diameter: 1.266"
• Deck Thickness: 0.533"