85SR5LightShow Posted December 24, 2004 Report 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.
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