I checked my compression on my motor recently and it read 140-145 on all cylinders except for number 8 which read 120. What should I be reading on a perfectly healthy motor. Also how much will one cylinder that low hurt my performance. By the way it is a stock shortblock thats been rebuilt about 2000km with AFR 185 heads and a comp HR284 blower cam. I guess the cam can bleed off some compression correct? The main reason Im posting this is because my car has been really down on power lately and this has to be the problem. It's been like this ever since I blew a head gasket at the track, and since that I've added another fuel pump (255 in line) and put on some new AFR 185 heads (replacing the edlebrock rpms) I've had it to the track and it only went 11.68@117MPH, and before it did an 11.38@122MPH, so something is really wrong here. But can the small loss of compression in that one cylinder make the car loose that much power?
sorry for the long post
Thanks
sorry for the long post
Thanks