Jay from APE can probably throw more light on this - I remember a long time ago Jay told me the steel in the OEM sleeves is way superior to aftermarket sleeves.
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burt monroe found used sewer pipe to have had the proper tempering to build his custom cylinders from.along with shrunk on aluminum cooling fins and welded on flanges.
when boring and honing cylinders you can tell the difference in hardness of certain grades of cast iron.advanced sleeves are some of the hardest i have ever machined.northwest is probably next hardest and they say they are weather treated(rusted then machined?).
leon
skiatook,oklahoma 1980 z1r,1978 kz 1000 z1r x 3,
1976 kz 900 x 3
i make what i can,and save the rest!
