Mercruiser Compression Ratio

[Tiki Time]

I just picked up a boat with an inboard 1970 Mercruiser 302 (5.0L) 215HP Ford small block. Does anyone know the stock compression ratio for this engine? Thank you!

 

[alldodge]

Probably 9.5:1
It varied from 8.5 to 9.5 depending on year and mods

http://www.f150hub.com/specs/302.html

 

[Scott Danforth]

9:1