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OPGI Price $349.99
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.
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
Part #: 99L0601