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Effective Gear Ratio Calculator
Radial Tire Size Calculator
Horsepower Estimate by ET & MPH
Compression Ratio
Engine Size in Inches and CC's
Converter Slip
Specs. for most Domestic Engines





News & Events

Cast Iron Head packages
With the volume of cast iron cylinder head work that has come in the shop this year we have decided to more >>
What's going on at SD in 2020
We're keeping plenty busy in the shop in this crazy world we're all living in. Demand for our CNC ported more >>
End of 2018 is fast approaching!!
Well it's been a while since we had an update on what's been going on at SD so here's a quick overview. more >>