Hi Z33ky - welcome to the site.
Preface: I'm not sure if the XFi motor's compression is different (it could be slightly higher, owing to different valve timing/lift/duration).
The spec on my '98 garden variety engine is 199 PSI @ 250 RPM according to the factory service manual.
Quote:
Minimum allowable compression pressure is 156.4 psi @ 250 RPM
Important: the maximum allowable compression pressure difference between any two cylinders is 14.2 psi @ 250 RPM
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