Im trying to determin if i have bad head gasket what measurements would indicate this on a compression test, btw this is on a jeep I6, not my camaro(thank god)

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79 Jeep Cj7

 

if it has a blown gasket you won't have a very high reading. what you want to look for is all the readings within 10% or so of each other. if a reading is way off you know you have problems.

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1st & 3rd

 

You remove all the spark plugs; disconnect the power lead to the distributor; block the throttle wide open; and one at a time, hook the gauge up to each cylinder and spin the motor with the starter, allowing at least 4 compression strokes on each one. Like ede said, look for consistency between cylinders. It's hard to say what they "should" read, probably 160-180 would be typical. If one is low, or 2 next to each other are low, you have a problem. For that matter, there are problems that can make one cylinder much higher than the rest also, which indicates a problem.

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