Posted by JohnCat! on April 04, 2013 at 18:48:52 from (18.104.22.168):
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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