Thanks Will.
In your case, it was just the opposite. I hope I haven't 'bad mouthed' the awesome 250! That sleeve is a work of art!
I've taken a few excerpts from some development engineers from Ford (Bill Santacecione has been quoted for his commons on I6's and the dentonation common X-flow heads). He said that the I6 was way too cool up front, and that wear was common in the front.
Asside from the more common 380 to 600 hp engines,Nizpro Turbocharging engineers automatically sleeve number one as it is a known problem point on I6's. They had to do this on the famed 1200 hp 4.0 dohc turbo.
http://www.nizpro.com.au/images/article ... /ghia7.jpg