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Puzzle to me. Heads are the most important for HP. THey are also the most simple to do. As to the valves all you have to do is to have good guides, the rest is very simple porting, if any, as Porsche heads are excellent to begin with. A good 3 angle valve job and you are off and running.
The bottom end is another thing. Oil mods, mods for good venting, good air flow between cylinders, nuff oil for rods at high rpm, nuff oil cooling, nuff oil for squirters. Rod bolts? Good rods, ie shot peened, good bolts, or Carillo rods and associated bolts. Mostly oil flow.
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