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Old 10-20-2019, 10:35 AM   #1
chiefdave
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Default Mallory 4004 distributor cap

The lower cap for my Mallory zc275 distributor has one of the threads stripped out on one of the holes. Has anyone repaired on of these? It does have 4 1/2 good threads left at the bottom and I could use a longer screw but don't know if that would be sufficient to hold it down. I hate to go with the MA5 cap and MA7 rotor and lose the vintage look.
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Old 10-20-2019, 10:52 AM   #2
BUBBAS IGNITION
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Default Re: Mallory 4004 distributor cap

Use a longer screw , but be carefull as the screw can go all the way thru the cap. And i have a box full of good used bottoms etc if ya need one ????????
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Old 10-20-2019, 11:07 AM   #3
Ronnieroadster
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Default Re: Mallory 4004 distributor cap

In the past when i had one with a completely striped out thread i just went to the next size screw diameter I taped the now striped hole and opened up the hole size slightly on the top section.

Not sure but I think the present size is 8/32 i used a 10/32 for the new size.
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Old 10-20-2019, 05:23 PM   #4
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Default Re: Mallory 4004 distributor cap

Just to let anyone interested in the NAPA Echlin MA5 cap and MA7 rotor I bought the last rotor from warehouse stock a couple years ago. I just did a search for the cap and that shows as “No stock” now also. It may be possible to find them in a local store’s stock so I’d suggest checking soon.
The rotor is an exact replacement for the Mallory, while the cap has towers, it is not a flat cap design.
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