jrbartlett Posted July 5, 2018 Share Posted July 5, 2018 What is the compression ratio or acceptable compression pressures for a '29 Super 8? Thanks. Link to comment Share on other sites More sharing options...
Owen_Dyneto Posted July 6, 2018 Share Posted July 6, 2018 (edited) Packard's published engine specifications for the 640/645 call for 84-87 psi compression. Edited July 6, 2018 by Owen_Dyneto (see edit history) Link to comment Share on other sites More sharing options...
edinmass Posted July 7, 2018 Share Posted July 7, 2018 Check it dry and wet. Hold the throttle open, and be sure all the plugs are out. They should be +/- 5 to 7 pounds. Link to comment Share on other sites More sharing options...
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