yzf400/426 head

hi im rebuilding my yzf 400 and i have a verry good 426 head with new valves in on first inspection the valves seem to be spaced out difrently or maybe larger as the come closer to the edge of cylnder wall also the 426 dosnt have the hot start pipe.

 

just wondering if any one could tell me what the difrences were as would like to use the 426 head as it looks to have had some porting work as well and as i allredy have it on shelf is a cheeper option than rebuilding my tierd old 400 head.

 

would be verry greatfull of any help many thanks edwin

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