Ok I am porting my 289 heads

Yes, inside the chamber.

I have never seen a pair of those heads, but the De-shrouding has it's best effect when the valve is opening and closing.

While it is lifting or seating, only 5/8ths of the valve is unrestricted. Once it is past 1/2 way open the valve shrouding effect starts to decrease.

But be sure, if it looks like a restriction, then it probably is. Just a little rounding off of the corners is all it takes to de-shroud. Wish I had a good photo to share.

Open chamber heads are not as bad for shrouding as the quencher chamber heads I show in my photos.

Thank you Mikes 66 The info on the 289 head porting will really help . And I will stay clear of the water jackets . I have full ported lots of SB Chevy heads in the past . But now I own a very clean 1965 Mustang 289 K 4speed car . I would like to build its 289 up to 350HP . And I think the only way is with a set of full ported 289 heads and the right camshaft .

wow, that was a lot of work, somehow FM wouldnt recognize it as a image, but whatever, like i said, they are aussie 2Vs, pretty sure with 4V valve sizes. I just bought them from a 3rd party, so i dont know all the specifics. But to me it looks like they could use some deshrouding, especially on the intake side, what do the smart people on the board say?

didnt mean to hijack sorry, hopefully you got what you need.

Those look like Boss 302 Heads. But it has been a while since I seen a pair... like 20 years ago....and from the other side, not the chamber side....

Those look like awsome heads to have. Small chamber, offset valves... and they are big, looks like the intake charge would swirl very well too.

well they are aussie 2v so they are 302 cleveland heads. What do you think, is there anything to be gained by deshrouding?

Your 289 is going to be running about 7000 rpm to get the 350 hp that you are looking for so unshrouding the valves is worth some work. You will want to radius the valve pockets on the intakes but the Aussy heads are much better than the heads that we have here in the States.