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On an intake manifold gasket on a GM 3.1 V6 the intake manifold gasket snakes through the pushrods, so the pushrods have to be taken out to replace the gasket. More than likely the technician didn't tighten the rocker arms, or mixed up the intake and exhaust pushrods, which are different lengths on that engine. Usually most technicians will replace the thermostat while they are doing the intake since once in a while the thermostat will refuse to work right after the cooling system has been drained and refilled. On that engine they will usually replace the oil pump drive seal as well since it is prone to leaking. If they didn't replace that that could be a potential source of the overheating. The guy that worked on it is obviously an idiot though if he forgot to put the oil and washer caps back on and screwed up the hood latch.
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