Evolution Powersports has 20+ years of big horsepower engineering experience under our belt. EVP engine builder John Bray has built hundreds of smaller displacement big horsepower (1800 hp from 4 liters) Porsche engines and knows what it takes to do an oversize bore kit. Thoughtful engineering and testing has gone into this kit to maintain stock like reliability while allowing for the maximum safe overbore. We were not content just boring and plating the cylinders – after carefully measuring the engine, it was determined that the only way to maintain reliability at the huge power levels we wanted to achieve was to bore out the block and install Moly Ductile Iron liners. This coupled with a custom set of CP forged pistons, heavy duty Carrillo connecting rods, head studs and a bore matched, oversize head gasket makes for a bulletproof big bore kit. This kit, coupled with our soon to be released Stage 7 Turbo kit can produce 400+ horsepower.