2003 3.1l overheat with thermostat removed

[J57ltr]

I'm not a fan of any type of stop leak, if it does work it probably won't be for very long. I would start gathering the parts needed to do the LIM it's not very hard to do it will take just basic handtools and the gasket set, and a set of rocker bolts as I recall they were TTY. Remember that the intake and exhaust pushrods are different lengths so keep track of where they go.

Jeff