In applications such as off-road, marine or other harsh conditions, the MSD Blaster High Vibration Coil is the best choice.  This protects the coil's internal components from high and low frequency vibrations that are commonly experienced in racing.

Features:
Metal canister is encased with epoxy to protect the windings from high vibration applications
Improved output coil for electronic ignitions, and MSD Ignitions (ballast resistor required for points) #8214
100:1 turns ratio and lower primary resistance produce high voltage output

Specifications:
Color    Black
Inductance    8 mH
Maximum Voltage    45,000 Volts
Peak Current    140 mA
Primary Resistance    .7 OHMs
Secondary Resistance    4.5K OHMs
Spark duration    350 uS
Turns Ratio    100:1
Weight    2.00 Lbs
Part Number    8222