Brookester: I had to replace a broken exhaust valve (carbon build-up) so know what is involved with replacing head gaskets - its requires good tools and time. The job took me and my son 2 weekends with time in between to have the heads checked for straightness, cleaned, pressure checked and the valves seated etc. Cost was $700 including new head bolts - not too bad.
What is the condition of your Disco? At 165k miles, the engine is no spring chicken. If you aren't ready to spend a lot of time and money there is a possible "quick fix" that might work if you are a lucky guy....it's called 'Thermogasket'. I've never used it myself but understand it costs about $100 and might (temporarily?) solve a leaking head gasket problem on your engine. Just a thought.
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