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440 big bore

1194 Views 1 Reply 2 Participants Last post by  SlammedRanger
I know its been a discussion many have had but i recently bought a 99 400ex with the 440 big bore. Ive heard there are many problems with the big bore and i purchased already built so not sure what all went into it. Its already having head gasket problems is it worth it to stay big bore or tear it down buy a new jug and start over.
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