mfg Posted December 26, 2022 Report Share Posted December 26, 2022 Installing 'regular 289' dished pistons in a R1 Studebaker Avanti engine (using steel shim head gaskets) drops the compression ratio down to approx......?...... 1) 7.5.....2) 8.0....3) 8.5.....or.....4) 9.0 . Link to comment Share on other sites More sharing options...
Dwight FitzSimons Posted December 26, 2022 Report Share Posted December 26, 2022 (3) 8.5 --Dwight Link to comment Share on other sites More sharing options...
mfg Posted December 27, 2022 Author Report Share Posted December 27, 2022 6 hours ago, Dwight FitzSimons said: (3) 8.5 --Dwight Yes!...That's it! Link to comment Share on other sites More sharing options...
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