JK 400 CFM Big Block Chevy Cylinder Heads with as cast ports. (Price per pair BARE) Upgrade:Select Option 2" deck block

2" deck block

Upper Injector location has been shown in testing to make slightly more power than the lower placement

060" Bore Hydraulic Roller cylinder heads feature factory LS7 intake valve locations with a shifted exhaust valve location to clear the smaller bore and accept OEM or aftermarket OEM Replacement Valvetrain Rocker Gear

250" Intake valve with a 50D valve job

factory-style blowers

JK 400 CFM Big Block Chevy Cylinder Heads with as cast ports. (Price per pair BARE) Upgrade:Select Option 2" deck blockPRODUCT DESCRIPTION The CID JK400 Big Block Chevy Cylinder Heads flow an impressive 400CFM from as cast ports on a standard bore! This allows us to offer serious performance from an affordable cylinder head and intake package. These symmetrical port BB Chevy cylinder heads no longer have left and right unequal length runners. We straightened up the valve angles to move away from the factory bath tub chambers and to a smaller more efficient combustion