AFR 227cc SBC Eliminator Racing Cylinder Head
Timeless Design - The first in our line of 60/40 Valve Spacing
High flowing AFR 227cc intake port small block Chevy angle plug aluminum cylinder
heads are available in two stages of performance. The Race Ready
version features 100% CNC ported intakes while the higher flowing
Competition version features 100% CNC ported intakes with greater detail. Both come
with 100% CNC ported 65cc or 75cc combustion chambers and 80cc exhaust ports
with a 3/4” thick head deck (ideal for nitrous or blower applications).
In addition we also offer the “as cast” Stage 1 heads
for 227cc performance on a budget. Standard valves are lightweight 8mm 2.100 intake
and 1.600 exhaust with AFR’s hardened ductile iron interlocking
valve seats. The 227 has 60/40 valve spacing and piston valve pockets
should be checked. The exceptional flow characteristics and 23°
valve angle make this the perfect head for 350 to 434 cid engines
in drag cars, sprint cars, and late model oval trackers operating
from 4500 rpm and up. The 227cc cylinder heads are available in either standard
or spread port exhaust. If you choose to run stud girdles AFR offset girdles are required (see footnotes here). These heads requires shaft mount rockers or .050 offset rocker arms for
durability and reliability of valve train components. With the .050 offset the intake rocker arm will be at a slight angle and the roller tip will not be perfectly parallel or centered on the valve tip. Not recommended for street use, unless shaft mount rocker is used. The exhaust port and bolt pattern are raised .250 over GM L-98 cylinder head, this rarely affects header or chassis fitment.
227cc SBC Aluminum Cylinder Head Race Ready Flow Chart
Tested on 4.125 Bore
227cc SBC Aluminum Cylinder Head Comp. Flow Chart
Tested on 4.125 Bore
Basic Package Components
100% CNC Ported Combustion Chambers
100% CNC Ported Exhaust Ports
100% CNC Ported Intake Ports
Competition 5-angle Valve Job
AFR #7256
Bead Lock Intake Valve, 2.100" x 5.006" Overall Valve Length
AFR #7254
Bead Lock Exhaust Valve, 1.600" x 5.024" Overall Valve Length
AFR #8000
PAC Racing Spring 1.550" OD Roller Dual Valve Spring, 225 lbs on seat, .710" maximum lift, Max .050 duration 260°
AFR #8511
Manley 10° 4140 Chrome Moly Retainers
Specifications, Features, and Optional Supporting Components
65-70 ft. lbs
Head Torque w/ Moly Lube
55-60 ft. lbs
Rocker Stud Torque
AFR #6820
Intake Gasket 1.280x2.090 w/ 3/8" radius, Fel-Pro #1206
Important: Do not port match your intake manifold to Fel-Pro gasket as it does not precisely fit AFR heads.
AFR #6310
SB Chevy Head Bolt Kit, ARP #134-3701
AFR #6305
SB Chevy Head Stud Kit, 12 Point Nuts, ARP #234-4301
Autolite 3910
Spark Plug Starting Range
65cc or 75cc
Combustion Chambers
Can be cut to 1.680, no deeper
Spring Pocket
60/40
Valve Spacing
Shaft Mount
Rocker Arms - T&D .450 Offset
23°
Valve Angle
.008" per cc
Angle Mill (Milling options available)
.006" per cc
Flat Mill (Milling options available)
Note: Flat & angle mills might require .120 thick intake gasket. |
