MSD Pro Stock Hemi Tube (Set of 8) 31012BL 0-5V data output feed for

0-5V data output feed for ECU

Available in five (5) sizes

Ultra-lite steel spools have more lightening holes and a narrower ring gear flange than standard units to help reduce rotating weight

1978-1983 Mercury Zephyr

MSD Pro Stock Hemi Tube (Set of 8) 31012BL 0-5V data output feed forMSD has new ignition accessories for Ford and Chrysler Hemi Pro Stock engines. These engines heads have a long, skinny tube machined in the head to access the spark plug. This narrow passage makes it considerably difficult to install spark plug wires. MSD answers with a new injection molded spark plug wire boot that reaches down to securely connect the wire to the spark plug. The set of eight includes the tubes and components to assemble the wire for