If coolant is leaking into the cylinders that will raise the compression in those cylinders. The question is will it bump it to a performance 11:1 compression ratio, or will it bend up your engine components with a 18:1 compresstion ratio?

It is possible that your head bolts just need to be re-torqued to the proper spec, but more than likely you will need to replace the head gasket.

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Thanks,
Dave

1998 BMW 540i Sport
1995 E320
1992 400E
1989 BMW M3
1979 Triumph TR7 (1st car)
1986 BMW 735i (Sold)
1980 BMW 320i (Sold)