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  1. #1

    Compression issue 96 GTX

    I have a 96 GTX that had sat for a while and seized up. A friend recommended a mechanic who fixed the motor by putting in 1 oversize piston and rebuilt the carbs. When I got the sled back, it ran ok and I broke it in. It never really ran as good as it used to, so I decided to dive in. I found the carbs were out of adjustment and after fixing that it ran a lot better. Then I noticed water leaking from one of the cylinder head bolts. I checked it with a torque wrench and found four other bolts not tightened to spec. I took it out and it maxed out at 6100 rpm when I know it should do 6700+. So I went and got a compression tester. 130 on the front cylinder and 145 on the back. I assume the back was th rebuilt cylinder. My question is: is this too much of a difference and is it affecting the top end speed?

    Thanks for any help!

  2. #2
    96XPSS's Avatar
    Join Date
    Feb 2006
    Warner Robins, GA Home of the 2007 All-Star Little League World Champions!
    Yes, it's too much. Pull the head and verify no scoring of the cylinder walls. Replacing one piston 1mm over and leaving the other stock is not a good practice.

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