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AFR's 185cc SB Ford "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.
 

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, less than 235* duration, upgraded spring #8019 recommended for higher RPM & larger cams
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)
185cc Street Head Flow Chart
  .200 .300 .400 .500 .550 .600
Int 142 195 247 276 285 289
Exh 118 164 200 210 213 215

Test conducted at 28" of water (pressure) on Superflow 1020
Bore Size: 4.060", 3/4" radius plate exhaust, 1 3/4" curved pipe

 

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 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"
CARB E.O# Part #'s 1422 & 1492
D-250-3

 
Recommended Components:
Intake Port Gasket, Fel-Pro #1262
Important: Do not use your AFR gasket as a template to port match your intake manifold as one AFR gasket is used for many AFR runner volumes.
Exhaust Port Gasket, Fel-Pro #1415
AFR #6837
Head Gasket, 302/351W, Fel-Pro #1011-1
SB Ford 1/2" Bolt Head Bolts, ARP #154-3603
SB Ford 1/2" Bolt Head Studs, ARP #254-4503
1/2" Bolt - 7/16" Thread Head Bolts, 289/302W: ARP 254-3708
Head Bolt Washers, Manley
Stud Girdle
Suggested Manifold
Performer or Performer RPM
Spark Plug Starting Range
Autolite 3924



 

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