This newer style of cap allows the use of high voltage plug wire connectors from the modern era.....
Standard P/N AL-482 Brass Pins
NAPA P/N ECH AL-162 Brass Pins
Donor / Original Vehicle: International Scout II 1975- 1977 w/ 304 CID engine
The depth of the stock Ford cap (1957 – 1973) is 1.765, depth of this new HEI-type cap is 1.695 for a difference of -.100. The spring-contact on the rotor has .25 movement, so it will have to compress an extra .100 with the new cap.
The distance from contact to contact on the stock cap is 1.925. Distance on the HEI cap is 1.890 for a difference of -.035. So the rotor will swing closer to the contacts by .0175".
The contacts of the stock cap are L-shaped, so apparently the electricity jumps not only across from the tip of the rotor, but also up from the top face of the rotor.
The contacts of the HEI-type cap are just a blade, so the electricity will be able to jump ONLY from the tip, therefore, the closer the tip to the contact, the better (I would guess).
Steve Metzger Tucson, Arizona