arsprod Posted February 6, 2015 Share Posted February 6, 2015 Anyone know if out of spec SM Miata heads (2mm short turn radius) are considered BTM or an upgrade? Technically they're still within factory specs other than horsepower increase. Quote Link to comment Share on other sites More sharing options...
speedengineer Posted February 7, 2015 Share Posted February 7, 2015 The plunge cut will count as porting, thus you will need to take the 6 points for porting in section C-18 of the rules. Quote Link to comment Share on other sites More sharing options...
Members Mike W. Posted February 7, 2015 Members Share Posted February 7, 2015 The other option is to go with a dyno reclass. Quote Link to comment Share on other sites More sharing options...
arsprod Posted February 7, 2015 Author Share Posted February 7, 2015 Thanks gents, that's what I expected but it's soooo tempting! Quote Link to comment Share on other sites More sharing options...
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