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I would say it depends on what the customer expects from this engine,which ET is he shooting for? Good ported heads with quality valves and springs,webcam 86c is good but Pauter has better cams for drag racing imho. Pauter super pro heads, water/meth injection.I would say that 500hp is about the limit with a stock bottom end,at least I haven't heard of anyone putting more to it yet.If he wants more,you won't have to go bigger but I would get a billet crank and Pauter or Carrillo rods. At the 3rd cylinder it is adviseable to drill a hole ca.12-14mm or mill a small window to reduce pumping losses and aid in crank case ventilation.Ventiliation is important with the type 4.
Mark
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