Proflow Cylinder Heads, SuperMax 220 CNC, SB Chev Aluminum, Assembled, 64cc Chamber

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. These heads are capable of producing over 600 HP straight out of the box!

• SBC 220 Angle Plug
• Specifications & Features:
• Material: A356 Aluminum
• Intake Port Volume: 220cc
• Intake seat size: 2.08
• Exhaust seat size: 1.6
• Intake Port Dimension: 2.200" H x 1.310" W x 3/8 Radius
• Intake Port Location: Stock
• Exhaust Port Volume: 80cc
• Exhaust Port Dimension: 1.420" H x 1.545" W
• Exhaust Port Location: 0.250" Raised
• Combustion Chamber Size: 65cc or 72cc
• Valve Cover Bolt Pattern: Perimeter Bolt
• Valve Angle: 23°
• Valve Spring Pocket Diameter: 1.580" O.D
• Max Valve Spring Pocket Machining: 1.750" O.D
• Warning: Do not machine spring pad any deeper.
• Deck Thickness: .750"
• Minimum Bore Diameter: 4.000"
• Flat Mill: .006" per cc 60cc Maximum
• Angle Mill: .009" per cc 55cc Maximum
• Note: Angle mills might require .120" Thick intake gasket.
• Spark Plug Dimensions: 14mm x .750" w/Gasket Seat
• Not Emissions Complient
• Plug: Angle Plug option
• Valve, 2.080" x 5.000" Overall Valve Length
• Exhaust Valve, 1.600" x 5.030" Overall Valve Length
• Racing Spring 1.550" OD Solid Roller Dual Valve Spring, 220 lbs on seat, .710" maximum lift, Max RPM 7200-7400
• 7/16" Rocker Studs
• 5/16" Guide Plates
• Viton Valve Seals
• Hardened Valve Spring I.D Locator 1.550" O.D x .780" I.D
• Intake Valve Seats 2.200" O.D x 1.750" I.D x .375" Deep
• Exhaust Valve Seats 1.696" O.D x 1.325" I.D x .305" Deep
• Bronze Valve Guides .502" O.D x 2.100" O.A.L
• Important: Do not port match your intake manifold to Fel-Pro gasket as it does not precisely fit MIC heads.
• Exhaust Port Gasket, Fel-Pro #1405
• Head Gasket, 350cid Fel-Pro #1003
• Head Gasket, 400cid Fel-Pro #1014
• SB Chevy Head Bolt Kit, ARP #134-3701
• SB Chevy Head Stud Kit, 12 Point Nuts, ARP #234-4301