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For comparison's sake, we also ran a standard cold-cranking compression test on our 305, registering 140-150 psi on all but cylinder 7, which came in at only 130 psi. Well within 10 percent of the other cylinders, it's not a bad number. We mention it to highlight the fact that the two measure different things-this cylinder doesn't create as much pressure as the others, but it also leaks less than the others. Both pieces of info are valuable in determining an engine's condition
1984 Camaro Z28 Leakdown Test - Pressure Points

For comparison's sake, we also ran a standard cold-cranking compression test on our 305, registering 140-150 psi on all but cylinder 7, which came in at only 130 psi. Well within 10 percent of the other cylinders, it's not a bad number. We mention it to highlight the fact that the two measure different things-this cylinder doesn't create as much pressure as the others, but it also leaks less than the others. Both pieces of info are valuable in determining an engine's condition  View Related Article

 

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