Ok i went to the machine shop with my h23a1 block and wanted to get it honed out. They told me they couldnt do it because they didnt have a diamond hone because of the frm on the cylinder walls. I was wondering if anyone had their block honed with the frm in it without using a diamond hone and if u had any problems with it?

 

"During manufacturing, a rigid hone using a GC-600-J or finer stone designed for nonferrous metal was used to finish hone the cylinder bores. Honing pressure should be adjusted to 29-43 psi (200-300 kpa), while the hone head is rotating at 45-50 rpm. The desired crosshatch pattern is 60° for a proper piston ring seal. To prevent stone loading and debris build-up, cleaning the stones every five cycles is recommended.

After the bores have been honed to final size, the block should be cleaned with hot, soapy water and then dried. A cleaning solvent is not advised as it has a tendency to only redistribute honing grit.

Aftermarket honing stone suppliers have found using a silicon carbide, 400 grit stone provides the desired finish and crosshatch required for this cylinder block."

Print that and show it to them