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Effective Gear Ratio Calculator
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Specs. for most Domestic Engines

 

 

 

 

News & Events

Growing Pains!!
05.19.08
We are all excited about the incredible demand for our heads, kits and engines. We've been a bit overwhelmed more >>
KRE D-port Timing Test
03.14.08
We finally were able to get a set of our 85cc KRE D-port heads on the dyno to see how much timing lead more >>
Happy New Year from SD Performance!!
01.05.08
Well, it's another new year and we are all excited at SD Performance to continue to grow in 2008 with more >>