Air Flow Research AFR2010 Magnum Cylinder Heads Chev Big Block 121cc Chamber 357cc Intake

AFR MAGNUM ALLOY CYLINDER HEADS CHEV BIG BLOCK 121CC CHAMBER 357CC INTAKE AFR2010If "Dirty Harry" drove a race car, then it would certainly be fitted with a pair of AFR 357 Magnum aluminum cylinder heads. If huge horsepower is what you are searching for, these castings will certainly deliver. With AFR's fully CNC-ported 357cc heads flowing 425 cfm, they represent the ultimate in airflow for your big block Chevrolet. These cylinder heads were targeted at larger cubic inch engines (509-632 c.i.d.) looking for maximum horsepower and rpm capabilities with a primary operating range of 3,500-8,000 rpm (this range is an average and will vary with engine displacement and component selection). These aluminum heads also provide impressive torque figures at higher rpm levels. Blown, turbo, and nitrous engines will especially like the larger, higher flowing intake ports. AFR 357cc Magnum BBC cylinder heads will work best with camshafts exceeding 0.750 in. gross valve lift to make better use of the substantial airflow found in the higher lift range. These 357cc heads come standard with AFR's trademark 3/4 in. thick cylinder head deck, reinforced rocker stud bosses, and premium one-piece stainless steel 2.300 in. intake and 1.880 in. exhaust valves. The AFR's fully CNC-ported 357 heads come with a 121cc chamber.

• 5-angle valve job
• 100% CNC Ported Chambers, Exhaust, and Intake
• Intake Valve, 2.300" stainless steel
• Exhaust Valve, 1.880" stainless steel
• 1.625 O.D. Roller Dual Valve Spring with dampener 255 lbs. on seat, .750" maximum lift
• 10° Chrome Moly Retainer
• 10° Valve Locks
• Guide Plates
• Viton Valve Seals
• Hardened Spring Cup
• Intake Valve Seats
• Exhaust Valve Seats
• Bronze Valve Guides Intake
• Bronze Valve Guides Exhaust
• AFR BB Chevy 7/16 Exhaust Studs
• AFR BB Chevy 7/16 Intake Studs
• Specs:
  Application: Chev Big Block Mark IV 396-454 C.I.D& GenV/VI 454 C.I.D.

  Cylinder Head Style:Assembled

  Cylinder Head Material:Aluminum

  Cylinder Head Finish:Natural

  Combustion Chamber Volume (cc):121

  CNC-Machined Combustion Chamber:Yes

  Intake Runner Volume (cc):357cc

  Exhaust Runner Volume (cc):124cc

  CNC-Machined Intake Runner:Yes

  CNC-Machined Exhaust Runner:Yes

  Combustion Chamber Style:Heart

  Intake Port Shape:Rectangular

  Intake Port Location:Standard

  Exhaust Port Shape:Round

  Exhaust Port Location:Standard

  Intake Valves Included:Yes

  Intake Valve Diameter (in):2.300 in.

  Exhaust Valves Included:Yes

  Exhaust Valve Diameter (in):1.880 in.

  Valve Springs Included:Yes

  Maximum Valve Lift (in):0.750 in.

  Outside Diameter of Outer Spring (in):1.625 in.

  Damper Spring Included:Yes

  Number of Springs Per Valve:Dual

  Retainers Included:Yes

  Retainer Material:Chromoly steel

  Locks Included:Yes

  Lock Style:10 degree

  Valve Stem Seals Included:Yes

  Rocker Arm Studs Included:Yes

  Rocker Arm Nut Thread Size:7/16-20 in.

  Rocker Arms Included:No

  Rocker Arm Nuts Included:No

  Guideplates Included:Yes

  Valve Cover Mounting Style:Perimeter bolt

  Accessory Bolt Holes Drilled:Yes

  Intake Valve Angle:24/4

  Exhaust Valve Angle:15/4

  Valve Guides Included:Yes

  Valve Guide Material:Bronze

  Valve Seats Machined:Yes

  Valve Seat Machine Style:5-angle

  Valve Seat Material:Ductile iron

  Steam Holes Drilled:No

  Oiling Style:Through pushrod

  Machined for O-Ring:No

  Heat Crossover:No

  Quantity:Sold as a pair.

  Notes:1 in. longer head bolts required on the four bottom exhaust bolt holes. These cylinder heads are competition ported.