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AFR`s 205cc "Competition" cylinder heads feature 100% CNC ported intake, exhaust & chambers, A356 aluminum castings and high quality components throughout. Recommended for race applications and very agressive street/strip builds operating up to 7400 RPM. Maximum intake flow potential @0.750" lift is 331 CFM.

205cc Aluminum SBF Cylinder Heads
Part # Rocker Type Combustion Chamber
1450 Stud Mount 58cc
1458 Stud Mount 72cc

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205cc Street Head Flow Chart
  .200 .300 .400 .500 .600 .650 .700 .750
Int 149 205 260 291 302 315 327 331
Exh 126 170 210 219 227 231 234 235
Basic Package Components
100% CNC Ported Combustion Chambers
100% CNC Ported Exhaust Ports
100% CNC Ported Intake Ports
Competition 5-angle Valve Job
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
Ductile Iron Intake Valve Seats 2.131" O.D x 1.680" I.D x .375" Deep
Ductile Iron 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
Specifications & Features:
Material
A356 Aluminum
Intake Port Volume
205cc
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 or 72cc
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"