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AFR Cylinder Heads
AFR Big Block Chevy 377cc and 385cc Magnum
BBC Cylinder Heads

with current pricing

AFR BBC 377-385cc Aluminum Performance 24° Racing Cylinder Heads

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*--click here to see cylinder head listings--
*--BBC 377/385cc runner have full 100% cnc ports along with full cnc'd 121cc combustion chambers--
*--BBC 377cc runner is equipped with 2.300/1.880 valves while the 385cc runner has 2.350/1.880 combination--
*--both heads feature an exhaust port that is notably stronger than our 357 making the 377 or 385cc an excellent choice in a forced induction or nitrous car--
*--ideal for 509 to 565cuin that want to run over 8000rpm or large cuin applications that like to be 7000-7500rpm (ti valves recommended for over 8000rpm operation) see AFR BBC Cylinder Head Options for upgraded valves and springs--
*--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 or go to the heavier Manley Nextek mechanical 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 377cc go to
BBC 385cc
go to
Flow Charts
go to
BBC Head Options
Top
afr cylinder headAFR BBC 377cc Magnum Cylinder Head
AFR’s 377cc cylinder head is standard with fully cnc'd machined ports along with the combustion chambers, titanium retainers and accomodates lifts up to .850--
  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 valve spring set-up or to upgrade the mech roller valve spring to the heavier Manley Nextek spring as well as CC Ultra Pro Magnum rocker arms-
cc port
shape
part # valve/dia. runner
cc
spring retainer seat pressure open pressure max. lift price/pair buy
121cc rectangle 3575 2.300/1.880 377 Bare heads have full cnc port including chambers/comp valve job $3087.51
2015 2.300/1.880 377 1.625 titanium 275 800lbs .850 $3588.03
go to
BBC 377cc
BBC 385cc go to
Flow Charts
go to
BBC Head Options
Top
afr cylinder headAFR BBC 385cc Magnum Cylinder Head
AFR’s 385cc cylinder head is standard with fully cnc'd machined ports along with the combustion chambers, titanium retainers and will accomodate lifts up to .850--
  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 valve spring set-up or to upgrade the mech roller valve spring to the heavier Manley Nextek spring as well as CC Ultra Pro Magnum rocker arms-
cc port
shape
part # valve/dia. runner
cc
spring retainer seat pressure open pressure max. lift price/pair buy
121cc rectangle 3580 2.350/1.880 385 Bare heads have full cnc port including chambers/comp valve job $3087.51
2020 2.350/1.880 385 1.625 titanium 275 800lbs .850 $3588.03
go to
BBC 377cc
go to
BBC 385cc
Flow Charts go to
BBC Head Options
Top
AFR 377cc Cylinder Head tested on bore of 4.600-Flow Chart cfm @28" H2O
valve size .200 .300 .400 .500 .600 .700 .800 .900
2.300 int. 176 260 328 382 415 427 434 437
1.880 exh. 148 205 263 302 316 330 340 345
AFR 385cc Cylinder Head tested on bore of 4.600-Flow Chart cfm @28" H2O
valve size .200 .300 .400 .500 .600 .700 .800 .900
2.300 int. 176 256 327 386 421 444 452 456
1.880 exh. 149 205 267 302 322 334 344 350
go to
BBC 377cc
go to
BBC 385cc
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
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 2.300x5.500 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