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AFR Cylinder Heads
AFR Big Block Chevy 345cc and 357cc Magnum
BBC Cylinder Heads

with current pricing

AFR BBC 345-357cc Aluminum Performance 24° Racing Cylinder Heads

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*--click here to see cylinder head listings--
*--BBC 345cc 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 357cc runner is full cnc port including combustion chambers with the chamber sized at 121cc--
*--345/357cc runner are truly a bolt on style BBC race heads & are equipped with one piece stainless steel 2.300/1.880 valves--
*--ideal for 509 to 565cuin and up well prepped strip applications or even some large 600+ cuin 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 345cc go to
BBC 357cc
go to
Flow Charts
go to
BBC Head Options
Top
afr cylinder headAFR BBC 345cc Magnum Cylinder Head
AFR’s 345cc 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 (.200 thru .400 or higher) 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 to exchange the mech roller valve spring for a hyd roller set-up or to upgrade to the Heavy Manley Nextek valve spring as well as CC Ultra Pro Magnum rocker arms & 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 3450 2.300/1.880 345 Bare heads have cnc bowl work,intake gasket match,as cast chambers/comp valve job $2083.56
2110 2.300/1.880 345 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 3450-1 2.300/1.880 345 Bare heads have cnc bowl work,intake gasket match,cnc chambers/comp valve job $2291.14
2110-1 2.300/1.880 345 1.625 steel 275 800lbs .850 $2703.39
go to
BBC 345cc
BBC 357cc go to
Flow Charts
go to
BBC Head Options
Top
afr cylinder headAFR BBC 357cc Magnum Cylinder Head
AFR’s 357cc 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 to exchange the mech roller valve spring for a hyd roller set-up or to upgrade to the Heavy Manley Nextek valve spring as well as CC Ultra Pro Magnum rocker arms & titanium retainers-
cc port
shape
part # valve/dia. runner
cc
spring retainer seat pressure open pressure max. lift price/pair buy
121cc rectangle 3570 2.300/1.880 357 Bare heads have 100% cnc port work and cnc chambers/comp valve job $3081.69
2010 2.250/1.880 357 1.625 steel 275 800lbs .850 $3491.03
go to
BBC 325cc
go to
BBC 335cc
Flow Charts go to
BBC Head Options
Top
AFR 345cc 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 .700 .800
2.300 int. 150 222 290 340 381 401 ---
1.880 exh. 131 171 210 244 267 280 ---
AFR 345cc 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 .700 .800
2.300 int. 172 246 312 356 390 397 ---
1.880 exh. 148 193 240 265 274 279 ---
AFR 357cc 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 .700 .800
2.300 int. 167 242 307 354 393 415 425
1.880 exh. 142 193 244 278 310 321 327
go to
BBC 345cc
go to
BBC 357cc
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 HYD Roller Valve Spring exchange #8061--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
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 2.30x5.500 Oal #7626 Cyl Head torque w/moly----75lbs
Exhaust Valve 1.880x5.442 Oal #7631 Rocker Stud Torque--------55lbs
Pac #1224 Valve Springs 1.625 AFR #8031 Int Gasket-1.775x2.500 w/1/2" radiused corners--AFR#6856
Manley 10° Chrome Moly Retainer AFR#8518
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 Edelbrock Manifolds------#2907,2927
Bronze Valve Guides-Exhaust #9046 Brodix Manifolds------#HV2000,2001,2005,2006
Intake Rocker Stud-7/16 #6407 Dart Manifolds------6200,6201,6202,6203
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