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Unread 05-09-2013, 10:33 AM   #1
NickP84CJ7
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Proper gaping for 84 Spark plugs?

4.2L 258
New HEI distributor just installed
What gap should i have on spark plugs?
Also could someone recommend me a Performance Plug?

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Unread 05-09-2013, 10:47 AM   #2
CSP
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0.045"
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Unread 05-09-2013, 10:58 AM   #3
Matt1981CJ7
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And the consensus is to don't bother with platinum plugs. Just buy standard Autolite copper.

Matt
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Unread 05-09-2013, 11:37 AM   #4
NickP84CJ7
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Matt I have the Autolite copper brand new and they burnt out... any idea why? i had just assumed it was because of the HEI distributor needing something of better quality?
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Unread 05-09-2013, 11:41 AM   #5
Matt1981CJ7
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It sounds like you have some tuning to do.

The Autolites are what many of us have run for years.

Matt
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Unread 05-09-2013, 11:55 AM   #6
CSP
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Define what you mean by they "burnt out".
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Unread 05-09-2013, 12:29 PM   #7
WindKnot
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^^^This.^^^

And Matt's right. All the fancy schmanzy* plugs made from obtanium that cost upwards of $8 a piece just don't seem to do anything for these old engines. A good old Copper plug does fine

*Schmancy? smanzy? smantsy?
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Unread 05-09-2013, 02:33 PM   #8
Balvar24
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$2 plugs are where it's at.
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Unread 05-09-2013, 04:00 PM   #9
NickP84CJ7
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Just got some plugs but they are .040 not .045 does that make a huge difference?
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Unread 05-09-2013, 04:04 PM   #10
Balvar24
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Gap 'em. Tool costs less than the set of plugs.
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Unread 05-09-2013, 05:43 PM   #11
swatson454
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I actually prefer the smaller gaps and don't go wider than .040. JMHO


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Unread 05-09-2013, 07:48 PM   #12
WindKnot
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Quote:
Originally Posted by NickP84CJ7 View Post
Just got some plugs but they are .040 not .045 does that make a huge difference?
Plugs are meant to be gapped before installing.
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