As many of you know, I am a proponent of the Lock and stitch inserts on the center mains in the 6.2/6.5 outer bolts.

The early blocks used 12mm outer bolts and the later engines use 10mm bolts.

I am of the opinion that on any cracked webs that have the 12mm Bolts that the 10mm L&S Insert should be installed in place of the 12mm ones.

The block must be drilled oversize anyway and using the 10mm insert will reduce the size of the hole and in effect keep more material in the block.

The only things is that it will be necessary to buy 6 10mm main bolts.

The holes in the cap are the same on both so that's not an issue.

If you are going to buy the tools, I would get the 10mm tooling.

Missy