Head upgrade

I'm finally getting started on my utu. The
plan is send the cam to Barry's for a
pulling grind and send the heads in fo get
resurfaced and new valves, one question I
have is has anyone put bigger valves in a
4210 head? And if so what did you use for
valves? Is there anything else I should
have done to the heads while they're at
the shop? The plan is be able to use this
tractor at a couple local pulls and still
be able to use it around the farm, thank
you for any insight and information
 
Read my comment below. Start with a 403 from a GB. Lp would be best. A u is just 283 cu in. M5 blocks are just 336. You can make any of them into 711. With enough $. But even at our local pulls the 711's are there.
 

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