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Thanks jFairman.
We have learned a lot about head studs sense then and the concept is interesting. I think on at least one of the 911's Porsche put different studs (delivar?) on the bottom and steel on the top which supports the thought.
Could be a combination of reasons. Me, if I were to build a 930 motor I would want full fins.
I wonder if the heat from the thermal reactors was the source of the extra heat that the bottom of the motor had to deal with. If so, they could have sacrificed cooling on the top of the cylinders to get them hoter. Cured a different problem than we were thinking of.
Still an emissions issue but not done because they wanted the motor to run hotter, it was just that the exhaust ran to hot.
Makes at least a little sense. Just a guess.
Fun!
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