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Author Topic:   441 Heads...Which spark plugs????
Dirt Roller

Total posts: 16
posted January 15, 2003 04:16 PM
I run a flat-top 355 with 6" rods, on gas. Was wondering what spark plugs would be the best to run?

Dirt Forum Champ
Total posts: 1565
posted January 15, 2003 09:33 PM UIN: 54865418
we always run ac r45ts in our 9:1 motors

Dirt Full Roller

Total posts: 67
posted January 15, 2003 10:53 PM
i also run the r45ts from ac delco thats the hottest plug they have always had good luck with them and thats my 2 cents

Dirt Roller

Total posts: 16
posted January 15, 2003 11:20 PM
Thanks for the help guys

Dirt Maniac

Total posts: 174
posted January 16, 2003 06:49 AM
What's the difference between R45T and R45TS? I think the TS tip protrudes further, but I'm not sure. I run the colder R43T myself, but always looking for another horse, you know?

Dirt Freak

Total posts: 295
posted January 20, 2003 08:12 PM
We ran the AC plugs also. autolite 303 will work to.

Dirt Freak

Total posts: 310
posted January 20, 2003 09:04 PM
rover you'd be surprised at the people that don't beleive a cold plug will foul less and create acleaner burn I've had some real (shall we say) conversations about that

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