Mercury - Quicksilver 808483T3 Distributor Cap Kit GM Marinized V8 Engines Delco HEI Ignition 808483T3. Overview. There's a certain confidence that comes when you twist the key and your V8 turns over instantly - no lag, no stumble, just that smooth, deep rumble every boater loves to hear. The Quicksilver 808483T3 Distributor Cap Kit helps make that moment reliable every single time. Designed for GM-based MerCruiser V8 engines with Delco HEI ignition systems (excluding MPI engines with ECM 555 co