Thirty spark plugs?

Here are some numbers from parts catalogs and other Cat books.

From early Thirty parts books: Spark Plug, #1-7/8-18 Thd.
Later parts books: 1B2360.
Other listings, 1B7033, 1B7044, 4B4595, 1F900,
Champion-Truck Special,
Champion #1 Commercial.

I use Autolite plugs in my gas Cats with good results, #3077 or #3076

Thank you all very much.

Unfortunately, Autolite 3077's are not available anymore. I posted this replacement list some years ago and thought it might be a good time to do it again.

good luck,

Biggastractor




Replacement spark plugs for autolite 3077:

Brand Model
AC Delco
18

AC Delco
18A

Champion
W89D

Champion stk
589

General Motors
5613050

Motorcraft
TT15

Motorcraft stk
101

Stitt
17E/17EX

I found some plugs at NAPA and a set of wires at Brillman. Hope to have an engine assembled soon for trials[attachment=53805]20190509_221227.jpg[/attachment]

I was going to ask what is the difference between a Champion 589 and a D16 or D21? (Heat Range wise)
I see it is an extended tip plug allowing the gap to actually be down inside the combustion chamber.
Reasonably certain I am on the right page in my mind as a 3076/3077 are D16/D21 equivalent?
Is my observation correct? :confused2: