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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

What's new at SD in 2021
08.27.21
We're busier than ever at SD CNC porting and machining heads and intakes and putting top end packages more >>
What's going on at SD in 2020
05.28.20
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!!
12.04.18
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 >>