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Our leakdown tool for this project was Proform's Dual-Gauge Leakdown Tester. One gauge regulates the amount of air being pumped into the cylinder, and the second measures the amount of pressure being lost; i.e., the rate of leakdown. It comes with both 14- and 18mm thread adapters.
1984 Camaro Z28 Leakdown Test - Pressure Points

Our leakdown tool for this project was Proform's Dual-Gauge Leakdown Tester. One gauge regulates the amount of air being pumped into the cylinder, and the second measures the amount of pressure being lost; i.e., the rate of leakdown. It comes with both 14- and 18mm thread adapters.  View Related Article