I don't really know the answer to your question.
But when I built a PG for my "new" Daytona, I asked Ultimate Converter Concepts to use a mechanical diode (and a Turbo style converter).
Here is a picture from the World Wide Web (www) showing different versions of mechanical diodes.

Mechanical_Diodes.JPG
1993 Daytona, 5.50 at 130mph (1/8) 1.19 sixty ft (PG). Link to 572 B1 - Part 1