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Vintage Pontiac Dyno Tuning Leak Down Tester

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If there is any doubt as to the internal condition of the engine, perform either a compression and/or leak-down test before dyno testing. An engine with low compression in any cylinder won't impress you on the dyno.
Dyno Tuning Basics - Jets, Timing, Camera, Action

If there is any doubt as to the internal condition of the engine, perform either a compression and/or leak-down test before dyno testing. An engine with low compression in any cylinder won't impress you on the dyno.  View Related Article

 

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