Engines with a leaking intake manifold are hard to kickstart and will never run properly. That’s why you need one of these leak testers in your workshop, which will once and for all take the guess work out of your installation job. Just bolt them to your manifold (use the stock gasket!), close both intake valves, by slowly turning the engine and with an air hose hooked-up to the G 1/4” fitting apply up to 10 psi of pressure. Spray soapy water around the gasket and manifold clamps and in case of appearing bubbles you can clearly spot any air leaks in your intake system.