AFR’s 180cc “Street” heads are a cost effective performance choice over re-worked factory heads. They feature 100% CNC ported intake, exhaust & chambers, A356 aluminum castings and high quality components throughout. Recommended for street, towing, or street/strip engines with displacements up to 383 cubic inches, operating up to 6000 RPM. Legal for 1994 and older emissions controlled vehicles under CARB EO #D-250-2. Component upgrade and machining options are available to customize AFR Heads to your specific build (see pg. 45). To ensure trouble free operation of AFR cylinder heads & parts please view the footnotes on pg. 50 for additional information.
Included Components | |
90% CNC Ported Combustion Chambers | |
100% CNC Ported Exhaust Ports | |
100% CNC Ported Intake Ports | |
Competition 5-Angle Valve Job |
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8mm Bead Lock Intake Valve, 2.020" x 4.900" Overall Valve Length | |
8mm Bead Lock Exhaust Valve, 1.600" x 4.950" Overall Valve Length | |
PAC Racing Spring 1.290" OD Hydraulic Roller Dual Valve Spring, 140 lbs on seat, .600" maximum lift, Max RPM 6300-6500 |
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7° Manley Chrome Moly 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 2.200" O.D x 1.750" I.D x .375" Deep | |
Ductile Iron Exhaust Valve Seats 1.696" O.D x 1.325" I.D x .305" Deep | |
8 mm Bronze Valve Guides .502" O.D x 2.100" O.A.L |
180cc Street Head Flow Chart | ||||
.200 | .300 | .400 | .500 | |
Int | 138 | 198 | 240 | 260 |
Exh | 110 | 158 | 190 | 207 |
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
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Intake Port Volume |
180cc
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Intake Port Dimension |
2.050" H x 1.250" W x 5/16° Radius
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Intake Port Location |
Stock
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Exhaust Port Volume |
64cc
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Exhaust Port Dimension |
1.450" H x 1.550" W
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Exhaust Port Location |
.100" Raised
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Combustion Chamber Size |
65cc or 75cc
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Valve Cover Bolt Pattern |
Perimeter Bolt
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Valve Angle |
23°
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Valve Spring Pocket Diameter |
1.460" O.D
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Max Valve Spring Pocket Machining |
1.750" O.D
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Warning: Do not machine spring pad any deeper. | |
Deck Thickness |
.750"
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Minimum Bore Diameter |
4.000"
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Flat Mill |
.006" per cc 60cc Maximum
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Angle Mill |
.009" per cc 55cc Maximum
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Note: Angle mills might require .120 thick intake gasket. | |
Minimum Cross Sectional Area |
1.810 sq. in.
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Spark Plug Dimensions |
14mm x .750" w/Gasket Seat
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Recommended Components: | |
Intake Gasket |
GM #12524653 LT1 or Fel-Pro #1284
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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 #1404 | |
Head Gasket, 350cid Fel-Pro #1003 | |
SB Chevy Head Bolt Kit, ARP #134-3701 | |
SB Chevy Head Stud Kit, 12 Point Nuts, ARP #234-4301 | |
Head Bolt Washers, Manley | |
AFR Stud Girdle | |
Suggested Manifold |
GM LT1 or LT4
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Spark Plug Starting Range |
Autolite 3924
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