AFR 23° SBC Cylinder Head 195cc Street Heads, L98 Angle Plug w/Heat Riser, 75cc

AFR's 195cc "Street" cylinder heads provide outstanding performance for small block Chevy applications, featuring 100% CNC ported intake, exhaust, and combustion chambers for maximum airflow efficiency. Constructed with A356 aluminum castings and high-quality components, these heads are designed for engines up to 400 cubic inches, operating up to 6500 RPM. They are CARB EO #D-250-2 compliant, making them legal for 1994 and older emissions-controlled vehicles.

Included Components

100% CNC Ported Combustion Chambers
90% CNC Ported Exhaust Ports
100% CNC Ported Intake Ports
Competition 5-angle Valve Job
8mm Bead Lock Intake Valve, 2.050" x 4.900" Overall Valve Length (AFR #7252)
8mm Bead Lock Exhaust Valve, 1.600" x 4.950" Overall Valve Length (AFR #7250)
PAC Racing Spring 1.290" OD Hydraulic Roller Dual Valve Spring, 140 lbs on seat, .600" max lift, Max RPM 6300-6500 (AFR #8017)
7° Chrome Moly Retainers 1.245" O.D x .885" I.D x .655" I.D (AFR #8514)
7° Bead Lock Valve Keepers (AFR #9007)
ARP 3/8" Rocker Studs (AFR #6409)
Adjustable 5/16" Guide Plates (AFR #6103)
Viton Valve Seals .600" O.D x .495" I.D (AFR #6612)
Hardened Valve Spring O.D Locator 1.380" O.D x .570" I.D (AFR #8042)
Ductile Iron Intake Valve Seats 2.200" O.D x 1.750" I.D x .375" Deep (AFR #9060)
Ductile Iron Exhaust Valve Seats 1.696" O.D x 1.325" I.D x .305" Deep (AFR #9070)
8 mm Bronze Valve Guides .502" O.D x 2.100" O.A.L (AFR #9051)

Flow Chart Data

Lift (in)	.200	.300	.400	.500	.550
Intake (CFM)	146	201	247	275	280
Exhaust (CFM)	119	166	197	213	218

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

Specifications & Features

Material: A356 Aluminum
Intake Port Volume: 195cc
Intake Port Dimension: 2.110" H x 1.265" W (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 (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, may require .120" Thick intake gasket)
Minimum Cross Sectional Area: 1.905 sq. in.
Spark Plug Dimensions: 14mm x .750" w/Gasket Seat