More GRB info added.
Sorry, V6 is not in my scope. Those are older engines and more likely to have problems.
If I was to put the time and effort into researching that and would publish a comprehensive article about it, the engine dismantlers and vendors would read this, conclude that it is easy to swap these in now and raise the price for these.
This in turn, would cause others to not buy V6 anymore and this would make the research useless.