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   4stHEAD 
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| 4-Valve Head Layout | ||||||||
| Software designed by engineers for engineers | ||||||||
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       Information graphics from the 4-valve vertical valves program (back) Definition 
        of some of the input and output variables used in the design of the 4-valve 
        vertical valve cylinder head  | 
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   ©Prof Blair & Associates  | 
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