NOSE crab distributor cap ???

[BUBBAS IGNITION]

I understand the differences on this nose cap with smooth insides ( needed for Harmon Collins mag and dual coil etc. But can someone fill in the specc , when used what years etc , ford ???

[35fordtn]

Jim,
From what I’ve seen, noticed, and heard is that that style cap was originally used in production by ford for 1942. Later replacements and newer reproductions have the coil contact rib on the inside (if I worded that correctly)

[supereal]

They were a 1942 year only. Hotrodders liked the appearance, so they remain in circulation. It is sometime forgotten that the "crab" caps require the correct rotor, which is not the same as the other types.

[42merc]

OEM '42 caps had no internal rib.
Most newer aftermarket caps have the internal rib, the exception being Bob Drakes version. IMO Drake's cap works well.
I also have purchased NORS caps from E Bay without the inside rib.
The internal rib cap is what breaks H&C rotors

[35fordtn]

Out of curiosity are the Drake caps aluminum or brass contacts?

[42merc]

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Drake's caps have / had brass contacts.
One thing to remember is the original design called for a paper gasket between the cap & dist body. Not using one, I believe leads to the common rotor/contact problem.
Mac's used to include a cap gasket in their dist gasket kit, but it was a thick cork - composition material that did not fit well. If you are using the H&C dual coil conversion, then two gaskets are required.