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Does anyone know where I might find roller rockers to suit the EA81? They have been fitted to engines in the USA an NZ but I can"t seem to track down anyone who can tell me where to get them. Apparently they are good for another 5 or so hp out of the engine... Also can anyone tell me if 85hp@4200rpm is do-able with this engine (EA81) or will I have to look at turbo charging?? Thanks, Adam