Proflow Cylinder Heads, AirMax 170, Big Block Ford FE ,390-428

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.

Combustion Chamber Volume: 72cc
Intake Runner Volume: 170cc
Exhaust Runner Volume: 125cc
Intake Valve Diameter: 2.09''
Exhaust Valve Diameter: 1.66''
Valve Stem Diameter: 3/8"
Valve Guides: Manganese bronze
Deck Thickness: 5/8''
Valve Spring Diameter: 1.55"
Valve Spring Maximum Lift: .600"
Rocker Stud: N/A
Guideplate: N/A
Pushrod Diameter: 3/8
Valve Angle: 13
Exhaust Port Location: Stock
Spark Plug Fitment: 14mm x 3/4'' Reach,

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