Heres the story.I have 462624 76cc heads & I looked up the casting numbers on Mortec.com & it came up with three different valve sizes.1.74/1.50,1.94/1.50 & 2.02/1.60. Is there any other numbers on the head that indicate what the valve sizes are?

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1980 Camaro Berlinetta
Driver For Medicap Pharmacy Racing