Mastercraft

Indmar Marine Thermostat 160° Drilled – LT1 & 5.7L Fresh Water Cooled Engines | Part #986034 Maintain optimal engine temperature with this genuine Indmar 160° drilled thermostat, designed specifically for fresh water cooled Indmar marine engines. The precision drilled bypass hole ensures smooth coolant flow and prevents air pockets from forming in the cooling system — a common cause of overheating in tow boats. Compatible with: Indmar LT1 and 5.7L fresh water cooled engines fitted to Malibu, Axis, Moomba, Supra, and Tige boats.

Indmar Marine Sparks Plug Kit – 5.7L Iridium | Catalyst Exhaust Engine | Part #491009 Upgrade your ignition system with this genuine Indmar iridium spark plug kit, specifically designed for Indmar 5.7L engines fitted with a catalyst exhaust system. Iridium plugs represent the pinnacle of spark plug technology — delivering stronger, more consistent sparks, longer service life, and measurably better performance compared to standard plugs. If you want the best ignition performance from your catalyst-equipped Indmar 5.7L — iridium is the answer. Compatible with: Indmar 5.7L marine engines fitted with catalyst exhaust systems on Malibu, Moomba, Supra, and Tige boats. Contact us to verify fitment for your specific model year

PORT SIDE EXHAUST ELBOW USED ON 5.7 CAT MANIFOLDS 2011 THRU CURRENT USE 765006 GASKET, 735020 V-BAND CLAMP. Indmar Marine Exhaust Elbow – Catalyst Extended Port | Part #585018 Keep your exhaust system flowing freely and your engine running clean with this genuine Indmar catalyst exhaust elbow, extended port design. A critical component in your Indmar marine exhaust system — the exhaust elbow directs hot exhaust gases away from the engine while the integrated catalyst helps reduce harmful emissions, keeping your boat compliant with Australian marine environmental standards.

Indmar Marine J-Formed Hose with Spring | Part #845040 Ensure reliable coolant flow with this genuine Indmar J-formed hose complete with internal spring. The integrated spring prevents the hose from collapsing under suction — a common problem on marine engines where cooling system pressure and flow rates are critical to preventing overheating on the water. Compatible with: Indmar marine engines fitted to Malibu, Moomba, Supra, and Tige boats.

CHEVROLET THERMOSTAT HOUSING 1 PIECE NLA.-USE 531067S THERMOSTAT HOUSING 2EA 605034 1/2" PIPE PLUGS AND 551004 GASKET. (Remove hoses going to elbow fittings in intake. Install 1/2" pipe plugs in place of those fittings)

STARBOARD SIDE EXHAUST ELBOW USED ON 5.7 CAT MANIFOLDS 2011 THRU CURRENT USE 765006 GASKET, 735020 V-BAND CLAMP. Indmar Marine Exhaust Elbow – Catalyst Extended Port | Part #585017 Keep your exhaust system flowing freely and your engine running clean with this genuine Indmar catalyst exhaust elbow, extended port design. A critical component in your Indmar marine exhaust system — the exhaust elbow directs hot exhaust gases away from the engine while the integrated catalyst helps reduce harmful emissions, keeping your boat compliant with Australian marine environmental standards.