Spark Plug Inquiry
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Mountain Pass
Joined: Feb 2017
Posts: 242
Likes: 17
From: OH
Spark Plug Inquiry
Any idea on the next colder plug than Autolite #45? having a hella time trying to locate reliable info. Tried using search function too.
in a 72 429, normally im messing with 335 series
in a 72 429, normally im messing with 335 series
Cargo Master
Joined: Oct 2020
Posts: 2,641
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With Autolite plugs the last number is the heat range. A 5 is a pretty typical heat range for a street engine so you could go to a plug with a 4, a 3 or a 2 to get something colder but all numbers are not generally available. The 45 is a Power tip style of plug so you might have to go to a conventional plug and or non resistor to get the heat range that you want. I think that they make a 32 and a 33 which is colder with a standard tip. You might have to order those plugs with an AR prefi
Autolite Racing).
Most of the time a 4 or 5 is about right for a street engine to allow the plug to stay clean yet not cause preignition problems.
Autolite Racing).Most of the time a 4 or 5 is about right for a street engine to allow the plug to stay clean yet not cause preignition problems.
Cross-Country
Joined: Sep 2022
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Cargo Master
Joined: Oct 2020
Posts: 2,641
Likes: 771
In Autolite plugs you can even get a 6 heat range in the 18mm power tip resistor plug. curiously my heat range chart doesn't show the 44 plug. In the Power Tip style of plug they show a 46, a 45 and a 5125 which is a long shell design in a 5 heat range. In a non resistor there's a 36, 35, 33 and a 32 listed. Standard tip resistor there's a 124, non resistor standard tip shows a 113.
I hope that helps.
I hope that helps.
Thread Starter
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Mountain Pass
Joined: Feb 2017
Posts: 242
Likes: 17
From: OH
In Autolite plugs you can even get a 6 heat range in the 18mm power tip resistor plug. curiously my heat range chart doesn't show the 44 plug. In the Power Tip style of plug they show a 46, a 45 and a 5125 which is a long shell design in a 5 heat range. In a non resistor there's a 36, 35, 33 and a 32 listed. Standard tip resistor there's a 124, non resistor standard tip shows a 113.
I hope that helps.
I hope that helps.
Hey Thanks! thats exactly what i was looking for. 124s on order now, too bad work DOESNT have an autolite book (O'Reilly)
Now to track down another gremlin (its always something isnt it?)
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