300TDI - What else to replace while changing the headgasket?

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Originally Posted by Red90

You don’t understand. When they warp, they warp again when heated. Every time.

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Of course, when they OVERHEATt. But the whole point of the exercise is to fix it so it doesn't overheat, had my head machined when i did the head gasket along with new viscous clutch and rodded radiator and it ran very cool even in slow off-road conditions.
Anyway lots of TDI owners the skim the head, its common practice - that's why you get it hardness tested first.