Mercury - Quicksilver 811635Q2 Distributor Cap Kit GM 4-Cylinder Engines Delco EST Ignition 811635Q2. Overview. Every boater knows that a reliable start sets the tone for the whole day. The Quicksilver 811635Q2 Distributor Cap Kit helps keep that confidence alive. Designed for marinized 4-cylinder GM engines with Delco EST ignition systems, this OEM kit includes both the cap and rotor - the heart of your ignition system.. It's built to handle the tough stuff: heat, vibration, and moisture. Wheth