Does anyone have information about 2010, 2011 & 2012 touring model heads that develop spiderweb cracks? Heard about this from Dave Mackie's shop. They won't perform any mods to them because they may fail.
The fracturing of the Mercury-Marine casting can occur in/around the guide bosses at the point of guide installation.
We use Extreme Pressure Lubricant # 3 on the AV&V guide on our Stage II, III, and IV Heads, and do not seem to have issues.
As I understand it it is only castings from a specific manufacturer. When I sent my heads in to Baisley he would only work on castings with a specific manufacturer marking. I got lucky and had the right ones. Mines a 2012. Just pulled my heads off after 18,000 miles. No issues.
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