AFR 2001 Big Block Chevrolet 335cc Rectangle Port Fully Ported CNC Chambers, 121cc, Race Ready, Complete w/ Hyd Roller Set up

AFR Recommended for radical street/strip or "Pro Street" applications with displacements up to 572 cubic inches, operating at or below 7000 RPM. Featuring fully CNC machined intake runners, exhaust ports and combustion chambers; these heads are capable of flowing 410 CFM at 0.800" of lift. 

Material  : A356 Aluminum

Intake Port Volume  : 335cc

Intake Port Dimension : 2.455"H x 1.755"W x 13/32 Radius

Intake Port  : Stock

Exhaust Port Volume :  135cc

Exhaust Port Dimension  : 1.780"H x 2.025" W

Exhaust Port Location  : .375" Raised

Combustion Chamber Size  : Full CNC 121cc

Valve Cover Bolt  : Pattern Perimeter Bolt

Valve  : Angle 24°/4° Int, 15°/4° Exh

Valve Spring Pocket Diameter  : 1.725" O.D

Max Valve Spring Pocket Machining  : 1.750" O.D

Deck Thickness : .750"

Minimum Bore Diameter  : 4.250"

Flat Mill  :  .006" per cc/ Maximum 114cc CNC Chamber

Angle Mill   : .009" per cc/ Maximum 104cc as cast

Note:Angle mills might require a .120" Thick intake gasket.

Minimum Cross Sectional Area : 3.275 sq. in.

Spark Plug Dimensions  : 14mm x .750" w/Gasket Seat

** With some domed aftermarket pistons, it may be necessary to slightly clearance or modify the piston due to there more efficient heart shaped combustion chamber design. Most of the newer designed dome profiles will clear. AFR strongly recommends material be removed from the piston and not the cylinder head. Our combustion chamber shapes are very critical to flow and altering the cylinder head can adversely affect flow and power production. It is the customers responsibility to verify proper piston to head clearance.

*** Heads are designed for 3/8" pushrods.  Larger pushrods will not fit without clearancing and is not recommended since some areas are very thin.

 AFR recommends the use of .120" thick-wall pushrods.

 AFR heads are available bare (without parts), call our tech line (714) 523-0530  for details.