Proflow Cylinder Heads, SuperMax 205 CNC, Bare, SB Ford 289, 302, 351W, Aluminum

Part Number : PFEAHF20560-BARE

Proflow Cylinder Heads, SuperMax 205, SB Ford 289, 302, 351W, Bare 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. Note: We suggest using Proflow Head Bolt Stepped washers part number PFEAHF-HBW. Proflow head bolt insert washers are designed to be used on Ford Windsor cylinder heads in applications where you have 7/16" head bolts being used in 1/2" bolt holes. This stops the head bolt hole distorting on aluminium heads when using 7/16'' bolts on 289 / 302 standard Windsor blocks. Specifications & Features: Material A356.2 Aluminum Intake Port Volume 203cc Intake seat size 2.08 Exhaust seat size 1.6 Intake Port Dimension 2.115" H x 1.300" W x 3/8 Radius Intake Port Location Stock Exhaust Port Volume 70cc Exhaust Port Dimension 1.400" H x 1.400" W Exhaust Port Location Raised .125" Combustion Chamber Size 58cc Valve Cover Bolt Pattern Perimeter Bolt Valve Angle 20° Valve Spring Pocket Diameter 1.580" O.D Max Valve Spring Pocket Machining 1.625" O.D Deck Thickness .750" Minimum Bore Diameter 4.000" Flat Mill .006" per cc 54cc Max (from 58cc); 68cc Max (from 72cc); Angle Mill .009" per cc 48cc Max (from 58cc); 62cc Max (from 72cc); Minimum Cross Sectional Area 2.165 sq. in. Spark Plug Dimensions 14mm x .750" w/Gasket Seat Head Bolt Diameter 1/2" Recommended Components: Rocker Type Mount 8mm Bead Lock Intake Valve, 2.080" x 5.000" Overall Valve Length 8mm Bead Lock Exhaust Valve, 1.600" x 5.030" Overall Valve Length PAC Racing Spring 1.550" OD Solid Roller Dual Valve Spring, 220 lbs on seat, .710" maximum lift, Max RPM 7200-7400 (upgrades available) 10° Manley Steel Retainers 1.500" O.D x 1.120" I.D x .705" I.D 10° Bead Lock Valve Keepers with lashcap recess ARP 7/16" Rocker Studs Adjustable 5/16" Guide Plates Viton Valve Seals .600" O.D x .495" I.D Hardened Valve Spring I.D Locator 1.550" O.D x .780" I.D Powder Metallurgy Intake Valve Seats 2.131" O.D x 1.680" I.D x .375" Deep Powder Metallurgy Exhaust Valve Seats 1.650" O.D x 1.350" I.D x .375" Deep 8 mm Bronze Valve Guides .502" O.D x 2.100" O.A.L Recommended Components: Intake Port Gasket, 1.200" X 2.000" w/ 3/8" radius, Fel-Pro #1262 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 #1487 Head Gasket, Fel-Pro #1011-1 SB Ford 1/2" Bolt Head Bolt Kit, ARP #154-3603 SB Ford 1/2" Bolt Head Stud Kit, ARP #254-4503 1/2" Bolt - 7/16" Thread Head Bolts, ARP 254-3708 Head Bolt Washer Kit, Manley Stud Girdle Suggested Manifold Super Vic or Vic Jr. Spark Plug Starting Range Autolite 3922