The only things I have had done was to replace the air intake with a POD filter and of course the exhaust. The guys did mention that it is quite possible that the car was running lean before when I had the old motor. In fact it may have been the cause of the giant crack in the block. Apparently when you run lean cylinders can overheat? They advised that it is possible that one or two cylinders were running hot which has caused the block to crack. Not sure.
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