AFR 227cc LT4 Eliminator SBC Aluminum Cylinder Heads

AFR's LT1/LT4 heads are designed for the Gen II reverse cooled SBC engine from 1992-1996. They feature all the same benefits and quality components as AFR's Gen I SBC Heads in addition to dual pattern valve cover mounting holes and Steel Retainers as standard equipment. Not compatible with self-aligning rocker arms. Component upgrade and machining options are available to customize AFR Heads to your specific build.






The Most Powerful LT4 AFR Racing Head!

High flowing AFR LT4 227cc intake port 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 Package features 100% CNC ported intakes with greater
detail and higher flowing exhaust ports. Both come with 100% CNC
ported 55cc-65cc combustion chambers and 80cc exhaust ports with a
3/4" thick head deck (ideal for nitrous or blower applications).
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 degree 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 aluminum cylinder heads are available only in
standard port exhaust. AFR offset stud girdles are the only special
parts required. Some applications require shaft mount rockers or
.050 offset rocker arms for durability and reliability of valve
train components. Standard rockers can be used but the intake rocker
arm will be at a slight angle and the roller tip will not be
perfectly centered on the valve tip. Not recommended for street use,
unless a shaft mount rocker system is used. Dual valve cover bolt
pattern is standard.

The exhaust ports are raised .250" over a standard GM L-98 cylinder
head.

color="#ffffff" size="4">Basic Package Components	color="#ffffff" size="4">Part #
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 2.100" x 5.000" O.A.L.	AFR #7256
8mm Bead Lock Exhaust Valve 1.600" x 5.030" O.A.L.	AFR #7254
1.550" OD Roller Dual Valve Spring w/ dampener, 220 lbs on seat, .710" maximum lift	AFR #8000
Manley 10° Steel Retainers 1.500" O.D x 1.120" I.D x .705" I.D	AFR #8505
10° Bead Lock Valve Keepers with lashcap recess	AFR #9009
ARP 7/16" Rocker Studs	AFR #6405
Adjustable 5/16" Guide Plates	AFR #6103
Viton Valve Seals .600" O.D x .495" I.D	AFR #6612
Hardened Valve Spring I.D Locator 1.550" O.D x .780" I.D	AFR #8048
Ductile Iron Intake Valve Seats 2.200" O.D x 1.750" O.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

color="#ffffff" size="4">Specifications, Features, and Optional Supporting Components

style="float:right;"> Material	style="float:right;">A356 Aluminum
Intake Port Volume	227cc
Intake Port Dimension	style="float:right;">2.240" H x 1.310" W 3/8 Radius
Intake Port Location	Stock
Exhaust Port Volume	80cc
Exhaust Port Dimension	style="float:right;">1.430" H x 1.540" W
Exhaust Port Location	.250" Raised
Combustion Chamber Size	55cc or 65cc
Valve Cover Bolt Pattern	Perimeter Bolt
Valve Angle	23°
Valve Spring Pocket Diameter	1.580" O.D
Max Valve Spring Pocket Machining	style="float:right;">1.680" O.D
Deck Thickness	.750"
Minimum Bore Diameter	4.000"
Flat Mill	style="float:right;">.006" per cc 60cc Maximum
Angle Mill	.009" per cc 55cc Maximum
Minimum Cross Sectional Area	2.340 sq. in.
Spark Plug Dimensions	style="float:right;">14mm x .750" w/Gasket Seat
Carb EO#	Not Emissions Complient
Intake Port Gasket	AFR #6860
Exhaust Port Gasket, Fel-Pro #1405	style="float:right;">AFR #6835
Head Gasket, 350cid Fel-Pro #1074	AFR #6803
SB Chevy Head Bolt Kit, ARP #134-3701	AFR #6310
SB Chevy Head Stud Kit, 12 Point Nuts, ARP #234-4301	style="float:right;">AFR #6305
Head Bolt Washers, Manley	AFR #6320
Stud Girdle GM L98	AFR #6200
Suggested Manifold	style="float:right;">GM LT4 or Edelbrock LT4
Spark Plug Starting Range	Autolite 3922

Important: Do not port
match you intake manifold to any Fel-Pro gasket as it does not
precisely match AFR heads.

Note: Milling head deck will affect flow numbers. Angle
mills
might
require
.120"
Thick
intake
gasket.