Cylinder Head, Vortec, Small Block Chevrolet, Each

Finally, a performance cylinder head at an economical price! GM's Vortec assembled head features modified combustion chambers and high-velocity port technology to offer very impressive power gains of between 20-40 horsepower over earlier cast-iron heads.

FEATURES INCLUDE: 1.95"/1.5" valves 64cc combustion chambers Straight spark plugs No heat risers Requires Vortec specific manifold Can be machined to accept 2.02"/1.60" valves Pressed-in studs, can be pinned or drilled Valve spring seat diameter is 1.48" Cams with more than 0.475" left require machining Fits 1955 and later small-block except LT1/LT4 and LS family of engines