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AFR Cylinder Heads
AFR Big Block Chevy 305cc and 315cc Magnum
BBC Racing Heads

with current pricing

AFR BBC 305-315cc Aluminum Performance 24° Street/Strip Cylinder Heads

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afr cylinder head

*--click here to see cylinder head listings--
*--BBC 305cc runner has cnc bowl blend (int and exh), intake gasket match, and choice of 100% cnc combustion chambers (121cc) or as cast chambers (115cc)--
*--BBC 315cc runner is full cnc port and combustion chamber size is 121cc--
*--305/315cc runners are equipped with one piece stainless steel 2.250 intakes and 1.880 exhaust valves--
*--ideal for 396-502 cuin engines looking for tons of low end torque, extreme pulling power, oval trackers or marine applications--
*--both cylinder heads are equipped with the heavy mechanical roller spring that is good up to .850 lift, but see BBC Head Options to exchange the mechanical roller spring for the hydraulic roller spring--
*--exhaust ports and bolt patterns are raised 3/8" over stock location but rarely create header or chassis fitment problems--
*--see basic parts list and some suggestions on manifolds and gaskets--
*--A 3/4” thick head deck makes the AFR head 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.

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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 BBC Cylinder Head Options to add a few items you may need--

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BBC 305cc go to
BBC 315cc
go to
Flow Charts
go to
BBC Head Options
Top
afr bbc cylinder headAFR BBC 305cc Magnum Cylinder Head
AFR’s 305cc cylinder head has two styles of port work: Both styles will have a CNC Bowl Blend Intake & Exhaust and Intake Gasket Match, with the difference being that the 115cc chamber head will have "as Cast Combustion Chambers", while the 121cc chamber head will have "CNC Combustion Chambers"--see    flow charts to notice how the CNC chambers help the head fill the cylinder better at low lifts to help the torque curve come in sooner supplying earlier throttle response--
  see basic parts list for parts included in head assembly and some suggestions on manifolds and gaskets--- --
-see    BBC Cyl Head Options CC Ultra Pro Magnum rocker arms, valve spring options and titanium retainers-
cc port
shape
part # valve/dia. runner
cc
spring retainer seat pressure open pressure max. lift price/pair buy
the 1st 2 items will have a CNC Bowl Blend Intake & Exhaust, Intake Gasket Match and as cast combustion chambers
115cc rectangle 3050 2.250/1.880 305 Bare heads have cnc bowl work,intake gasket match,as cast chambers/comp valve job $2083.56
2100 2.250/1.880 305 1.625 steel 275 800lbs .850 $2495.81
the next 2 items will have the same cnc bowl work & gasket match as the 2 items above, plus 100% cnc chamber work
121cc rectangle 3050-1 2.250/1.880 305 Bare heads have cnc bowl work,intake gasket match,cnc chambers/comp valve job $2291.14
2100-1 2.250/1.880 305 1.625 steel 275 800lbs .850 $2703.39
go to
BBC 305cc
BBC 315cc go to
Flow Charts
go to
BBC Head Options
Top
afr sbc cylinder headAFR BBC 315cc Magnum Cylinder Head
AFR’s 315cc cylinder head will be standard with the 100% cnc port and 100% cnc chamber work--
  see basic parts list for parts included in head assembly and some suggestions on manifolds and gaskets--- 
-see    BBC Cyl Head Options CC Ultra Pro Magnum rocker arms, valve spring options and titanium retainers-
cc port
shape
part # valve/dia. runner
cc
spring retainer seat pressure open pressure max. lift price/pair buy
121cc rectangle 3150 2.250/1.880 315 Bare heads have 100% cnc port work and cnc chambers/comp valve job $2912.91
2000 2.250/1.880 315 1.625 steel 275 800lbs .850 $3322.25
go to
BBC 305cc
go to
BBC 315cc
Flow Charts go to
BBC Head Options
Top
AFR 305cc Cylinder Head w/Partial CNC Port and "as cast Chambers" Bore size 4.310-Flow Chart cfm @28" H2O
valve size .200 .300 .400 .500 .600 .650 .700 .800
2.250 int. 154 223 287 335 363 368 --- ---
1.880 exh. 133 175 210 239 261 268 --- ---
AFR 305cc Cylinder Head w/Partial CNC Port and "100% CNC Chambers" Bore size 4.310-Flow Chart cfm @28" H2O
valve size .200 .300 .400 .500 .600 .650 .700 .800
2.250 int. 168 242 303 339 360 362 --- ---
1.880 exh. 142 187 225 252 271 274 --- ---
AFR 315cc Cylinder Head w/ 100% CNC Port and 100% CNC Chambers Bore size 4.600-Flow Chart cfm @28" H2O
valve size .200 .300 .400 .500 .600 .650 .700 .800
2.250 int. 169 249 312 353 380 383 386 387
1.880 exh. 146 184 238 271 296 303 310 315
go to
BBC 305cc
go to
BBC 315cc
go to
Flow Charts
BBC Head Options Top
the AFR BBC 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 #8509 for the 1.625 spring-Titanium 10° Retainers installed in place of the steel retainers that are normally supplied $190.12
valve spring --AFR Upgrade #8039-upgrade trades the mechanical roller spring #8031 to a heavier mechanical spring Manley Nextek #8022-320lbs seat pressure-860lbs open pressure (@ .840 lift) with a max lift of .840 $124.16
valve spring --AFR #8061 valve spring upgrade trades the mechanical roller spring (#8031)for the hydraulic roller spring #8002-173lbs seat pressure-473lbs open pressure and a max lift of .650 NC
titanium valves --AFR upgrade PN#7634--Upgrade 1.88 exh. valve to Inconel 1.88 Exh valve $160.00
comp cams ultra pro magnum rocker --Comp Cams ULTRA Pro Magnum Roller Rocker-1.7 ratio-"Lifetime Guarantee" so strong that the body is guaranteed for life against breakage and unlike alum. rockers, rockers can be rebuilt by replacing the trunion, roller tip, and bearings thru Comp Cams- $318.32

the AFR BBC Cylinder Head Basic Package Components are listed below
and a few specifications and suggestions for Supporting Components--
parts incl. w/Heads part # some suggestions
Intake Valve 2.25x5.500 Oal #7620 Cyl Head torque w/moly----75lbs
Exhaust Valve 1.880x5.448 Oal #7630 Rocker Stud Torque--------55lbs
Pac #1224 Valve Springs 1.625 AFR #8031 Int Gasket-1.72x2.45 w/1/2" radiused corners--AFR#6855
Manley 10° Chrome Moly Retainer AFR#8518 Int Gasket-1.82x2.54---FP#1275
10° Chrome Moly Valve Locks AFR#9005 Exh Gasket----------AFR#6858
Viton Valve Seals #6611 Head Bolts Mark V----ARP#135-3707 or AFR#6308
Hardened Spring Cup #8046 Head Stud kit-Mark V----ARP#235-4713 or AFR#6307
Intake Valve Seats #9062 Head Bolts Mark IV----ARP#135-3703 or AFR#6306
Exhaust Valve Seats #9064 Stud Girdle----------AFR#6210
Bronze Valve Guides-Intake #9045 Manifolds------Edel 2907,2927
Bronze Valve Guides-Exhaust #9046 Manifolds------Brodix HV2000,2001
Intake Rocker Stud-7/16 #6407 Manifolds------Dart 6200,6201
Exhaust Rocker Stud-7/16 #6406 Spark Plugs--champ C59C, Auto 3932
Adjustable Guide Plates-3/8 #6109 spring pocket can be cut to 1.750, but no deeper