Economy tune/timing question

[secondarychaos]

Hello,
I've got a question about Economy tunes. there was some debate about economy tunes and "ventilated" blocks
My question is this: what in the Economy tune is suspect to causing this Rapid remodel of the engine compartment? Some seem to think it was the timing causing too early or too high of a pressure spike. Does this sound accurate?
I understand that this was mostly on heavily modified or PMR trucks, but I like to know all that I can, and may modify my truck heavily some day and dont want it to
Thanks,
Dan