Nos ford svo discontinued gt40 valves 1.940 - 1600 stock length ss swirl new

<table border='0' cellpadding='8'> <tr><td> <a href= 'http://rover.ebay.com/rover/1/711-53200-19255-0/1?ff3=2&toolid=10039&campid=5336885271&item=122785008489&vectorid=229466&lgeo=1' target='_blank'><img src='http://thumbs2.ebaystatic.com/m/mZQMcM5KWaoMmM3ye95lyUA/140.jpg' border='0'/></a></td><td><strong>$249.99</strong><br>End Date: Friday Mar-30-2018 10:45:17 PDT<br>Buy It Now for only: $249.99<br><a href='http://rover.ebay.com/rover/1/711-53200-19255-0/1?ff3=2&toolid=10039&campid=5336885271&item=122785008489&vectorid=229466&lgeo=1' target='_blank'>Buy It Now</a> | <a href='http://rover.ebay.com/rover/1/711-53200-19255-0/1?ff3=4&toolid=10039&campid=5336885271&vectorid=229466&lgeo=1&mpre=http%3A%2F%2Fcgi1.ebay.com%2Fws%2FeBayISAPI.dll%3FMfcISAPICommand%3DMakeTrack%26item%3D122785008489%26ssPageName%3DRSS%3AB%3ASRCH%3AUS%3A104' target='_blank'>Add to watch list</a></td></tr> </table>

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These are not genuine GT40 valves, the M prefix to part number suggests that they are later replacement Ford Motorsport items. GT40 valves part number had 'C' prefix, exh should be 1.625" dia and inlets had 30° seat angle and also all had single valve keeper groove. That double groove would suggest these might be made from SBC valve stock.
 
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