July 2005 //////If I am doing a valve conversion on my Stude heads to put bigger valves in.... What spec valve(s) do I get?////// biggest intake would be a 1.9" and 1.65" exh. stems are 11/32" and overall length is 5.15625" but + or - 0.030" is ok. Email me if you have a specific question. Nemesh