Store › Regitar USA Tune Up Kit f/Mercruiser GM V-8 Engines w/Delco HEI [RMR011] Regitar USA Tune Up Kit f/Mercruiser GM V-8 Engines w/Delco HEI [RMR011] $54.99 Tune Up Kit for Mercruiser GM V-8 Engines with Delco HEITune Up Kit for Mercruiser GM V-8 Engines with Delco HEI. Brochure (pdf) Add To Cart Added! Tune Up Kit for Mercruiser GM V-8 Engines with Delco HEITune Up Kit for Mercruiser GM V-8 Engines with Delco HEI. Brochure (pdf)