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AFR`s 185cc "Street" cylinder heads feature 100% CNC ported intake, exhaust & chambers, A356 aluminum castings and high quality components throughout. Recommended for engines from 302-393 cubic inches, operating up to 6000-6500 RPM. Legal for 1995 and older emissions controlled vehicles under CARB EO #D-250-3. Not compatible with OEM pistons.

185cc Aluminum SBF Cylinder Heads
Part # Rocker Type Combustion Chamber
1422 Stud Mount - Emissions Legal 58cc
1420 Stud Mount - Emissions Legal 72cc
1492 Pedestal Mount - Emissions Legal 60cc
1388 Stud Mount - Non-Emissions Legal 58cc
1387 Stud Mount - Non-Emissions Legal 72cc

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185cc Street Head Flow Chart
  .200 .300 .400 .500 .550 .600
Int 142 200 255 285 295 297
Exh 118 164 200 210 213 215
Included 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 2.020" x 4.900" O.A.L.
8mm Bead Lock Exhaust Valve 1.600" x 4.950" O.A.L.
Pedastal 8mm Bead Lock Intake Valve 2.020" x 5.080" O.A.L
Pedastal 8mm Bead Lock Exhaust Valve 1.600" x 5.100" O.A.L
PAC Racing Spring 1.290" OD Hydraulic Roller Dual Valve Spring, 140 lbs on seat, .600" maximum lift, Max RPM 6300-6500 (upgrades available)
7° Manley Steel Retainers 1.245" O.D x .885" I.D x .655" I.D
7° Bead Lock Valve Keepers
ARP 3/8" Rocker Studs
Adjustable 5/16" Guide Plates
Viton Valve Seals .600" O.D x .495" I.D
Hardened Valve Spring O.D Locator 1.380" O.D x .570" 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
Thermactor Air Injector Reducer Bushing (5/8"-11 x 7/16"-14)
Specifications & Features:
Material
A356 Aluminum
Intake Port Volume
185cc
Intake Port Dimension
2.045" H x 1.205" W x 3/8 Radius
Intake Port Location
Stock
Exhaust Port Volume
70cc
Exhaust Port Dimension
1.355" H x 1.360" W
Exhaust Port Location
Stock
Combustion Chamber Size
58cc, 60cc, or 72cc
Valve Cover Bolt Pattern
Perimeter Bolt
Valve Angle
20°
Valve Spring Pocket Diameter
1.460" 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)
Note:Angle mills might require a .120" Thick intake gasket.
Minimum Cross Sectional Area
2.025 sq. in.
Spark Plug Dimensions
14mm x .750" w/Gasket Seat
Head Bolt Diameter
1/2"