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Head choice - porting 4210's

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PostPosted: Thu Apr 04, 2013 5:48 pm    Post subject: Head choice - porting 4210's Reply to specific post Reply with quote

I am working on a couple tractors, a UTU and GTB. I have a set of 4210's for the UTU and am wondering how much I can safely go with my porting. It is 403 ci with extra valve lift so I'd like to open up the chambers a bit around the valves and also open up the intake ports, is there alot of meat there before I break though, those of you who have done this before?
Also I have a GTB all stock that I'd like to get some more hp out of. Doesn't pull 5 bottoms like it used to! Would I be better off running the original heads with larger valves or throwing a set of 4209 heads that I have on it, higher compression but smaller valves? Thanks for the input guys!

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jd plowboy
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Joined: 30 Jul 2005
Posts: 1168

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PostPosted: Thu Apr 04, 2013 6:16 pm    Post subject: Re: Head choice - porting 4210's Reply to specific post Reply with quote

i dont know how far you can go on the porting on the 10 heads, definitly dont try to port it to a square port gasket cause i bought a tractor that a guy ported 10 heads to square port gaskets and they cracked in the exhaust ports from being cut to thin.
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