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An "interference engine" typically refers to the fact that the valves are retracted into the head when the piston comes to the top of it's stroke and that if the valves are not retracted in time, the piston would otherwise collide with the valves, causing extensive engine damage.

The answer to that question is, "yes"; but then, most modern engines are interference type, since that is necessary if an engineer wishes to produce an efficient and powerful internal combustion engine.

The Saturn 4 cylinder engine uses a timing chain to keep the valve timing synchronized with the crankshaft. While many less adequately designed engines use timing belts which require periodic replacement, the Saturn 4 cylinder engines do not require that the timing chains be replaced unless the engine is being rebuilt.

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