Ported X head pics
Them cutaways, i think were from the later "emission heads" All 340/360 head are basically the same. if your after max porting, every on says the X head will flow more because you can grind......in the right spots more. I haven't ported a X head to say.
Jim no disrespect, this just one mans opinion but. this is a good example of what NOT to do to a exhaust port. In my opinion, if you need to grind on the exhaust port you need a better head, and then still leave it alone. But, if you must, clean it up, only, and don't even clean the floor of the exhaust port Especially at the header flange area.
Just my 2c
Not a ton of help I’m sure but these are the only two I have from my heads apparently.
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View attachment 1716039128