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Title: my 400ex Post by: dirtyredneck on April 14, 2009, 05:32:05 PM i have a 2000 400ex with a 440 bigbore kit, stage 2 hot cams, i am rebuilding my head and want to go 1mm bigger on my intake and exahust valves. is it worth the money?
Title: Re: my 400ex Post by: crom A zone on April 14, 2009, 05:46:18 PM not enless u got full system pipe no air box and a bigger carb
Title: Re: my 400ex Post by: hellrazr on April 18, 2009, 08:45:12 PM I would assume since you have a 440kit, with a different cam then you porbably have a good exhaust. Do you have your head ported? That will be alot more beneficial then larger valves? If you are ported then the +1 would probably help some more since you are running a larger bore already.
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