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Does anyone know how to tell 4v cleveland heads apart without taking them off. I have heard that if you switch from open chambers to quench chamber heads it raises compression. My car is a 71 torino gt. Any help is appreciated.
 

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4V (big valve head) has 4V cast into the top of the head outside the rocker cover boltdown point.
Dunno about whether you can tell if open chamber or closed though.
 
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