Hello my name is Chris. I just bought an 87 13b non turbo rx7 off of ebay and it has a problem. its gutless. the guy i bought it from said it needs new pop off valves, but ive never heard of pop off valves. if anybody could tell me what these are or tell me what could be wrong with it it would be greatly appreciated. thanks for the help and hope to hear from someone soon.

thanks,
Chris