I am open to the process, I have seen it for years in some of the applications mentioned and some not yet. I doubt that the weight of the thin steel sleeves would be that much. I do agree with the comment regarding side thrust, especially in the long stroke engines that seem so popular now.
Having said that, and being on record as having those concerns, I realize some "real world" testing will be needed before allowing them out the door for sale, at least it would be prudent. As an on the record skeptic, I will offer up my new SPF roadster that I was going to stick a '67 GT500 engine in as a test bed. I will run the piss out of it and will put plenty of miles on it and give an honest appraisal of it's abilities. David you can PM me or send me on offline e-mail to arrange delivery when needed

.