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Yes, As long as you didn't change the compression from what the kit was.
 

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I am wanting to put a big bore kit on my ltz400 does anybody know if I have to rebuild the head or get bigger cans order to put a big bore kit on it
 

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It might be a good time to change valves and springs, but not necessary,unless they are in poor condition.
That said, you will get more performance if you get bigger cams( which require better springs). The stock cams wont fill that cylinder at higher rpms, but you will still notice an improvement. A larger carb and full exhaust will also help.
 
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