Thread: 106 GTi Valve Springs into Silvertop Head Help
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Old Sep 17, 2013 | 10:03 AM
  #29  
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XRT_si
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It's funny how things have changed - Ian Howell used to say you would need double valve spring conversion for big boost/power a few years ago!

Now people use 106/ST springs for moderate power and single Cat Cams springs for 600bhp!
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