From what I've found, the double hump heads could be 2.02/1.60s or 1.94/1.50s with either 64 or 62 cc chambers.
http://www.jimsperformance.com/headchart.html
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12.922/102.28
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-69 C-10
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-89 Isuzu Trooper...Kinda
-03 Kawasaki KFX-400
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