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They are identical heads on a 2000 3100 and a 2000 3400. You can look at the casting numbers. Those should end in 170 casting number
The 94-99 3100 are 1.72" intake valve and the 00+ 3100 and all 3400 are 1.76" intake. That is the main difference. All are 1.42 exhaust. 28.6cc combustion chamber is what you are working with for the combustion chamber.
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