Head off

[yeadon_m]

I know nothing but thought the aim was mainly to ensure the rings don't snag in which case any method of shaping the port edge away from being sharp would do, providing its slight and won't 'port' the cylinder?
Watching this, as my own nikasil 550B ate a couple of pistons, preceded by scoring where my fingers tell the port edges are / were sharp.
Cheers,
Mike

[Coyote]

Change of plans. I always let my son order my Amazon stuff because he has Amazon Prime. He gets free 2 day shipping on everything. He punched all the info in his Iphone last night. I thought he ordered it. This evening he showed up with his flex shaft Dremel. I forgot I got him one for Christmas several years ago. He said I thought I'd save you some money and let you use this.
So that's what I'm going to try. The working head is a little larger than the air grinder, but it still should work. He said Home Depot has a pretty good selection of Dremel bits. I'll go there tomorrow and see what I can find. One thing good about this tool is it's variable speed. I like that. What I don't like is the speed control is on the motor body and not at your fingertips.

[tz375]

Keep the speed low and the touch light

[Coyote]

My son figured out how they did the chamfers at the factory. They did it BEFORE the liner was pressed in. Piece of cake.

[Coyote]

Today is my birthday. As a gift, my son came over and ground chamfers on ALL the ports. His hands (and vision) are 3 times what mine are. The chamfers are not large but all the sharp edges are gone so they shouldn't snag any rings. As luck would have it, one head gasket is really stuck on the cylinder. The other 2 came off fairly clean. All the base gaskets stuck to the crankcase. I got one off clean but haven't tried the others. Time to reverse the procedure soon!. Need a cool day. Those don't occur here in August

[tz375]

As luck would have it, I was grinding chamfers on my ports today and I used a Cometic head gasket that stuck to the head like nothing I had ever seen before. That thing would never have leaked. Time to order some more. I have a few OEM and copper gaskets and none are as good as COMETIC

[markush]

Hi!

Coyote: ...They did it BEFORE the liner was pressed in...

No, the (GT-) liners aren't pressed. They are cast together with the the cylinders. See graphic of a sawed GT750-cylinder.
Note the thicker areas in the outer shape of the liner (red).