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[teamroper60]

Originally Posted by johnny87

I do think however that the concept of Exhaust Gas Recirculation was never intended as a means of controlling cylinder pressure/temperature for the purpose of protecting the head gaskets.

I never said that was the intended purpose. However, we cannot discount what is occurring. Often we do things for one reason (in this case emissions) and get other, secondary results as well... Likewise, if we alter the operation of something, there is also the possibility of secondary alterations that may not have been accounted for initially. Ford ran into this in early 03, when they started messing with the original programming... They monkeyed with it to stop the romping and ended up having to do a whole series of new flashes because each change presented a new, unforeseen problem.

Originally Posted by johnny87

For instance, under heavy loads the EGR valve is closed. Factory programming does this. The EGR Valve only opens under light to medium load conditions. Therefore I think that the design of the engine already accounts for a shut EGR Valve.

That is correct. The design accounts for no EGR at idle and WOT. Eliminating it will not affect CPs under those conditions.

However, the average 6.0 spends most of its life operating at light to medium throttle (engine load), where the EGR is open to some extent. So if we remove EGR, that change will affect the engine "where it lives".