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, 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: 58cc
  • Intake Port Volume: 205cc
  • Intake Port Dimension: 2.13" x 1.28"
  • Exhaust Port Volume: 71cc
  • Exhaust Port Dimension: 1.40" H x 1.40" W
  • Exhaust Port Location: Raised .250"
  • Spark Plug Location: OEM
  • Intake Valve Dimensions: 2.08" x 5.00" x 8mm
  • Exhaust Valve Diameter: 1.60"
  • Valve Stem Diameter: 8mm
  • Valve Spring Diameter: 1.575" (40mm)
  • Maximum Valve Lift: 0.710" @ 490lbs
  • Spring Installed Height: 2.04" @ 146lbs
  • Valve Spring Pocket I.D.: 1.64"
  • Valve Guide Material: Manganese Bronze
  • Valve Guide O.D.: .490" (.560"at base)
  • Rocker Stud Thread Size: 7/16" x 14
  • Valve Angle: 20
  • Deck Thickness: .750"