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The cast-iron cylinder bore liners are 0.10 thick. The pen points to thealuminum surrounding them, which is 0.11 thick. Although the specialhead gasket is designed for a primary gas seal against the end of theiron liner, the prolonged effects of corrosion can reduce the thicknessof the surrounding aluminum and lead to chronic head-gasket failure. Thesame goes for overboring; the more material removed from the innerdiameter of the iron liner, the less area to seal the gasket.