180CC SBC LT1 STREET CYLINDER HEAD

$2,216.17

SOLD AS A PAIR

Option 1:



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

 
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
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
Intake Port Volume
180cc
Intake Port Dimension
2.050" H x 1.250" W x 5/16° Radius
Intake Port Location
Stock
Exhaust Port Volume
64cc
Exhaust Port Dimension
1.450" H x 1.550" W
Exhaust Port Location
.100" Raised
Combustion Chamber Size
65cc or 75cc
Valve Cover Bolt Pattern
Perimeter Bolt
Valve Angle
23°
Valve Spring Pocket Diameter
1.460" O.D
Max Valve Spring Pocket Machining
1.750" O.D
Warning: Do not machine spring pad any deeper.
Deck Thickness
.750"
Minimum Bore Diameter
4.000"
Flat Mill
.006" per cc 60cc Maximum
Angle Mill
.009" per cc 55cc Maximum
Note: Angle mills might require .120 thick intake gasket.
Minimum Cross Sectional Area
1.810 sq. in.
Spark Plug Dimensions
14mm x .750" w/Gasket Seat

 
Recommended Components:
Intake Gasket
GM #12524653 LT1 or Fel-Pro #1284
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
Spark Plug Starting Range
Autolite 3924
 



Item# Description
908

180cc SBC LT1 Street Cylinder Head



$2,216.17

ADD TO CART
909

180cc SBC LT1 Street Cylinder Head



$2,216.17

ADD TO CART

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