coolant leak

That is the area most commonly degraded by pitting.

bite the bullet now/cover/chain/pump/thermo clutch and use a anode in radiator drain plug and enjoy the summer and save your core plugs !!!
ask me how I know

https://www.bing.com/aclk?ld=e8AKq2...z&rlid=bab11df9f5c71a8a00d57db0cddcca41&ntb=1

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