85SR5LightShow Posted December 24, 2004 Report Share Posted December 24, 2004 I just got my waterpump put in and my AE86 is running cooler but, the guy that installed it said that the copression ratio is off and that i might have a blown head casket. and he wants 425 to put one in. is this a task i can do with the haynes manual and do it myself. and what is the copression ratio and what does it mean. Link to comment Share on other sites More sharing options...
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