Early A with 340 Exhaust question

you messin' with me? Pickin' on the slow guy? lol...

I mean.. it's acid so.... should corrode the hell out of it. I'm interested in how it's controlled etc. Seems like a really good idea for "smoothing" things out, like that abrasive goo porting, "sort of"...
I'd have to see it to believe it. It would clean cast but not eat it and yes there would be no control. Extrude hone is the only controlled way except for a die grinder. ANd with a grinder it's tough to check the thickness way up inside the port.