AFR cylinder head logo

AFR Cylinder Heads
AFR SBC High Flowing 227cc/235cc
Small Block Chevy Aluminum Performance Track Head

with current pricing

AFR SBC 227cc/235cc High Flowing Aluminum Performance 23° Cylinder Heads

click here to enlarge AFR Cylinder Head Image
afr cylinder head

*--click here to see cylinder head listings and pricing--
*--AFR 227 comes in 2 stages of performance, the Race Ready version features 100% CNC port while the higher flowing "Competition" version features 100% CNC porting that's more aggressive with greater detail--
*--the 227cc runner is standard with lightweight 8mm 2.100 intake/1.600 exhaust and 65cc or 75cc combustion chambers while the 235cc is prepped with 2.125/1.600 valves and a choice of 70cc or 80cc chambers and is only available with the Competition CNC Port--
*--The 227cc heads are available in either standard or spread port exhaust-let us know at checkout in special instructions--
*--both the 227cc and the 235cc have 60/40 valve spacing requiring shaft mount rockers (suggested) or a .050 offset intake rocker arms which require AFR offset stud girdles for durability and reliability of valve train components-use of the .050 offset intake rocker arm will put the rocker at a slight angle and the roller tip will not be perfectly parallel or centered on the valve tip--
*--340cfm at .800 lift for the 235cc runner and 319cfm for the 227cc runner at .750 lift- see flow charts--
*--exhaust port and bolt pattern are raised .100 (3/32”) over GM L98 Heads but rarely affects header or chassis fitment--
*--see basic parts list and some suggestions on manifolds and gaskets--
*--A 3/4” thick head deck along with the significant intake volume makes these AFR heads ideal for nitrous or blower applications--great tech help @ www.airflowresearch.com--

If you need assistance in selecting the best AFR cylinder head for your application, you may want to e-mail support@dfperformance.com a description of your combination or call 856-767-4095 or 856-767-7740, and we'll see if we can help out.

ups logo credit card logo

FREE ground SHIPPING inside the continental USA on purchases over $2900.00--allow about 2-3 weeks for Cylinder Head orders to ship--
check out AFR SBC Cylinder Head Options to add a few items you may need--

Don't forget to join us onFacebook logo our facebook page



SBC 227cc go to
227cc/comp
go to
235cc
go to
Flow Charts
go to
SBC Head Options
Top
afr sbc cylinder headAFR SBC 227cc Race Ready Cylinder Head
AFR’s Version-2 227cc Race Ready Small BLock Chevy head is perfect for 350-434cid Drag engines Sprint Car applications or Late Model Oval Trackers-ideal operating range of 4500rpm and up--
  see basic parts list for parts included in head assembly and some suggestions on manifolds and gaskets--- 
-see    SBC Cyl Head Options for Titanium retainer upgrade, valve and valve spring options, as well as the AFR girdle for the 227/235 heads-
cc plug part # valve/dia. runner
cc
spring retainer seat pressure open pressure max. lift price/pair buy
75cc angle 1067NP 2.100/1.600 227 Bare heads have full cnc race ready port/comp valve job $1508.35
1067 2.100/1.600 227 1.550 steel 225 600lbs .710 $1745.03
65cc 1068NP 2.100/1.600 227 Bare heads have full cnc race ready port/comp valve job $1508.35
1068 2.100/1.600 227 1.550 steel 225 600lbs .710 $1745.03
go to
SBC 227cc
227cc/comp go to
235cc
go to
Flow Charts
go to
SBC Head Options
Top
afr sbc cylinder headAFR SBC 227cc Competition CNC Port Cylinder Head
AFR’s Version-2 227cc Small BLock Chevy head with the Competition CNC Package improves upon the already tremendous flow by having a more aggressive and detailed port profile but still remains at the 227cc size enhancing the velocity and overall flow characteristics even further-ideal operating range of 4500rpm and up--
  see basic parts list for parts included in head assembly and some suggestions on manifolds and gaskets--- 
-see    SBC Cyl Head Options for Titanium retainer upgrade, valve and valve spring options, as well as the AFR girdle for the 227/235 heads-
cc plug part # valve/dia. runner
cc
spring retainer seat pressure open pressure max. lift price/pair buy
75cc angle 1120NP 2.100/1.600 227 Bare heads have full cnc competition port/comp valve job $1880.83
1120 2.100/1.600 227 1.550 steel 225 600lbs .710 $2133.03
65cc 1121NP 2.100/1.600 227 Bare heads have full cnc competition port/comp valve job $1880.83
1121 2.100/1.600 227 1.550 steel 225 600lbs .710 $2133.03
go to
SBC 227cc
go to
227cc/comp
235cc go to
Flow Charts
go to
SBC Head Options
Top
afr sbc cylinder headAFR SBC 235cc Competition Cylinder Head
AFR’s 235cc Small BLock Chevy head with the Competition CNC Package with 340cfm at .800 lift moves this head to the the top for 23° sbc heads-ideal for very large dispalcement sbc combinations-shaft mounted rockers are highly suggested, but .050 offset rockers can be used with the aid of AFR stud girdle-
  see basic parts list for parts included in head assembly and some suggestions on manifolds and gaskets--- 
-see    SBC Cyl Head Options for valve and valve spring options as well as the AFR girdle for the 227/235 headsNOTE: part numbers ending in -Ti are already equipped with titanium retainers
cc plug part # valve/dia. runner
cc
spring retainer seat pressure open pressure max. lift price/pair buy
80cc angle 1130NP 2.125/1.600 235 Bare heads have full cnc competition port/comp valve job $2109.75
1130-Ti 2.125/1.600 235 1.550 titanium 225 600lbs .710 $2497.75
70cc 1132NP 2.125/1.600 235 Bare heads have full cnc competition port/comp valve job $2109.75
1132-Ti 2.125/1.600 235 1.550 titanium 225 600lbs .710 $2497.75
go to
SBC 227cc
go to
227cc/comp
go to
235cc
Flow Charts go to
SBC Head Options
Top
AFR227cc Race Ready CNC Package Flow Chart cfm @28" H2O tested on a 4.125 bore
valve size .200 .300 .400 .500 .550 .600 .700
2.100 int. 148 210 261 298 304 312 318
1.600 exh. 114 162 204 220 225 229 237
AFR227cc "Competition" CNC Package Flow Chart cfm @28" H2O tested on a 4.125 bore
valve size .200 .300 .400 .500 .550 .600 .700
2.100 int. 152 212 265 300 312 319 327
1.600 exh. 120 187 214 230 234 238 243
AFR 235cc "Competition" CNC Package Flow checked on a 4.125 bore-Flow Chart cfm @28" H2O
valve size .200 .300 .400 .500 .550 .600 .650 .700 .800
2.125 int. 159 221 270 305 316 324 330 334 340
1.600 exh. 120 175 214 235 242 247 251 254 256
go to
SBC 227cc
go to
227cc/comp
go to
235cc
go to
Flow Charts
SBC Head Options Top
the AFR SBC Cylinder Head Options listed below
may only be ordered along with a complete set of AFR Cylinder Heads--
--keep in mind, free shipping for purchases totaling $2900.00 or more for USA zipcodes--
Item description price buy
titanium retainer --AFR Upgrade #8508-Titanium 10° Retainers installed in place of the steel retainers that are normally supplied--NOTE: part numbers ending in -Ti are already equipped with titanium retainers $190.12
valve spring --AFR #8027 valve spring upgrade trades the 8000 spring for the upgraded 8001 valve spring for lifts up to .800 w/more spring pressure-250lbs seat pressure-750lbs open pressure (check with your cam manufacture for necessary spring pressures) $161.12
valve spring --AFR #8050 valve spring option for solid flat tappet cams and hyd rollers, (check with your cam manufacture for necessary spring pressures) trades the 8000 spring for the 8016 spring, that is 1.550 diameter, 140 lbs seat and 375 lbs open at .525 lift with a max lift of .600 (check with your cam manufacture for necessary spring pressures) $55.00
inconel valves --AFR upgrade #7514-inconel exhaust valves replace the stainless valves that are normally supplied with the heads-used in high heat situations such as forced induction or nitrous $170.72
inconel valves --AFR upgrade #7515-Heavy Duty Intake valves replace the stainless valves that are normally supplied with the heads-used in high heat situations such as forced induction or nitrous $32.00/a set
afr offset stud girdle --AFR part# 6208 .050 offset stud girdle for the 227/235 cylinder head-- $121.25

the AFR SBC Cylinder Head Basic Package Components are listed below
and a few specifications and suggestions for Supporting Components--
parts incl. w/Heads part # some suggestions
227cc Intake Valve 2.100x5.006 Oal #7256 Cyl Head torque w/moly----70lbs
235cc Intake Valve 2.125x5.006 Oal #7253 Rocker Stud Torque--------55lbs
227/235cc Mech Roller Spring-1.550 225/600lbs AFR #8000 Exh Gasket----------AFR#6835 or FP#1405
Manley 10° Chrome Moly Retainer #8511 Int Gasket (1.31x2.180)--AFR#6820 or FP#1206
10° valve locks #9009 Head Bolts-ARP#134-3701(12pt) / 134-3601(6pt)
Viton Valve Seals #6612 Head Stud kit--ARP#234-4301(12pt) / 134-4001(6pt)
Hardened Spring Cup #8048 227ccManifolds---AFR TXR,#4801, LT4
Intake Valve Seats #9060 235ccManifolds---AFR TXR,#4801
Exhaust Valve Seats #9070 Spark Plugs-----Autolite 3910
Bronze Valve Guides-(Int and Exh) #9051 Offset Stud Girdle----------AFR#6208
Intake Rocker Stud-7/16 #6405 valve spring pockets can be cut to 1.680, no deeper
Exhaust Rocker Stud-7/16 #6405 Valve Spacing/Valve Angle----------60/40--23°
Adjustable Guide Plates-5/16 #6103 Rocker Arms --T&D .450offset shaft mount