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I've researched this here & on MorTec & no one seems to know with certanity. Some say 487X heads have 2.02/1.60 valves yet there are some 487X'ers with 1.94/1.50 valves. Others say the 487X'ers have larger intake runners. Does anybody know for sure?
 

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X heads have intake larger intake ports. 5cc or so larger than the regular castings. Most came with 2.02/1.60 valves. I've seen one set with 1.94/1.50 valves.

Larry
 
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