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I have to bore the jugs, my last ring job did'nt go well. I found a 3mm over big bore kit on XBay for $150. Is that way to big, or can it work and be somewhat reliable? If not, the seller has .25 over and .75 over set for $180 each. I think it would be fun to add some cc's to the project but 3mm over sounds extreme and problematic :?:
What should I do?
 

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3mm (12'th over) is about as far as you can take a 450.

So if anything ever happens, you can't go "up" any higher, not enough cylinder wall left.
Not sure if you need a special head gasket for that or not - maybe someone here knows that??
 
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