I have a pair of 2004 500efi's and am looking for a repair or replace thermostat and gasket kit. They spec 140 deg thermostats. Do I have to but all parts individually or do they offer a gasket kit or complete kit?

this should have all the parts, I didn't see a kit

http://www.marineengine.com/parts/me...mostat-housing

Thank you.

You can buy them as a kit form and you can buy them with 2 different style of T stats one is the standard and one is persay a performance T stat. It is able to flow more water

I have all of them for any thing GM Marine related. 140 and 160 and 170 degree t stats as well

The sleeve part number 10 is separate does not come in the kit. FYI just wanted to be clear about it. And I have them as well