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Ships within 48 hours · Estimated delivery Jul 27 - Aug 1
Upper Injector location has been shown in testing to make slightly more power than the lower placement
0" of area at the plenum and of the runner
Available for all our shaft mount cylinder heads
Available with CHE Ductile Iron Valve Seats or CHE Bronze Valve Seats
JK 400 CFM Big Block Chevy Cylinder Heads with as cast ports. (Price per pair BARE) Upgrade:Select Option Upper Injector location has beenPRODUCT 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
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