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:

Material: A356 Aluminium
Combustion Chamber: 120cc
Intake Port Volume: 320cc
Intake Port Dimension: 2.45" x 1.75"
Exhaust Port Volume: 125cc
Exhaust Port Dimension: 1.75" H x 2.00" W
Exhaust Port Location: Raised .375"
Spark Plug Location: Angled
Intake Valve Diameter: 2.25"
Exhaust Valve Diameter: 1.88"
Valve Stem Diameter: 11/32"
Valve Spring Pocket I.D.: 1.735"
Valve Guide Material: Manganese Bronze
Valve Guide O.D.: .530" (.570" at base)
Rocker Stud Thread Size: 7/16" x 14
Valve Angle: 24 Intake / 15 Exhaust
Deck Thickness: .750"