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Old 03-15-2008, 05:26 PM
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autolite 65 or 144?

hi,

I currently have autolite 65's in my 454 right now and when i just pulled them they were black. I was wondering what the difference is between the 65's and the 144's? Are the 144s a hotter burning plug? I have never used another plug besides the 65's but i obvesly need to change.

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david
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Old 03-15-2008, 07:06 PM
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Just the opposite as far as the heat range on an Autolite. A 5 is hotter than a 4.

The bigger problem is that these are two entirely different size plugs. The 65 has a hex size of 13/16, a gasket seat, and a body length (reach) of 3/4. The 144 is a 5/8 hex, taper seat, and a reach of .460

Do you know what head casting you're using on your 454? If not that what year.
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Old 03-15-2008, 11:14 PM
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they are the eldelbrock rpm performer rectangle port heads.

thanx,
david
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Old 03-17-2008, 06:46 AM
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The 65 is the right type. An Autolite 3924 is closer to what Edelbrock recommends. The Edelbrock head uses a 3/4 reach gasketed plug with 13/16 hex.

There are quite a few numbers that have that configuration.

If the plugs are black or sooty it sounds like it's running a tad rich or you don't have enough initial timing in it to keep it running clean.
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Old 03-17-2008, 10:03 AM
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thank you for the info. I just looked at the plug again and its acually a autolite 64. I tried to see the differance between a 64 and 65 and I dont see any different specs at all. Is there any?

thanx
david
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Old 03-17-2008, 10:43 AM
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The 64 is one step colder than the 65. Other than that no difference
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Old 03-17-2008, 10:48 AM
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thanx. i think ill try the 65's
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