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Gasket type plugs with LT1 heads?

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Old 03-02-2006, 09:38 PM
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Gasket type plugs with LT1 heads?
I have stock heads, and purchased NGK R-5671-A7 plugs as per Lloyd Elliott's recommendation. However, they are a gasket type plug....not tapered. Will they fit or no?
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Old 03-02-2006, 11:02 PM
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Re: Gasket type plugs with LT1 heads?
You should be using a tapered plug, AFAIK. Maybe he knows something different about it.
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Old 03-02-2006, 11:07 PM
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Re: Gasket type plugs with LT1 heads?
I would use the NGK R 5671-A7's on any LT1.
From his e-mail...
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Old 03-03-2006, 06:55 AM
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Re: Gasket type plugs with LT1 heads?
That's what I'm using. I wondered about that, but when I inspected the crush gasket closely, it appears that the gasket face is tapered. I figured that it would probably form into the tapered surface in the cylinder head. I put them in and torqued them like it said on the box (hand tight + 1/2-2/3 turn) and they seem to be working just fine.
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Old 03-03-2006, 06:56 AM
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Re: Gasket type plugs with LT1 heads?
I forget what Lloyd told me on the phone...whats the advantage to these again?

-Dustin-
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Old 03-03-2006, 07:12 AM
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Re: Gasket type plugs with LT1 heads?
Originally Posted by Bersaglieri
I forget what Lloyd told me on the phone...whats the advantage to these again?

-Dustin-
Less detonation I believe?
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Old 03-03-2006, 07:18 AM
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Re: Gasket type plugs with LT1 heads?
Originally Posted by Javier97Z28
Less detonation I believe?


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Old 03-03-2006, 08:25 AM
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Re: Gasket type plugs with LT1 heads?
They're colder plugs...he said more timing / N2O / boost before detonating.
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Old 03-03-2006, 08:27 AM
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Re: Gasket type plugs with LT1 heads?
Putting a gasket style plug in a tappered style hole may effect the reach of the plug. I would check that first.
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Old 03-03-2006, 10:27 AM
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Re: Gasket type plugs with LT1 heads?
Originally Posted by fast 93 z
Putting a gasket style plug in a tappered style hole may effect the reach of the plug. I would check that first.
The threaded part of the R-5671-A7 plug is identical length to a TR55.
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Old 03-03-2006, 10:37 AM
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Re: Gasket type plugs with LT1 heads?
Originally Posted by cehan
The threaded part of the R-5671-A7 plug is identical length to a TR55.
Correct....but when screwing a gasket plug in a tapered hole might change the reach when it bottoms out compared to a tapered hole with tapered plug or gasket style hole with gasket style plug.
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Old 03-03-2006, 10:52 AM
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Re: Gasket type plugs with LT1 heads?
I'm gonna e-mail Lloyd a link to this thread...hopefully he can chime in.
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Old 03-03-2006, 03:50 PM
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Re: Gasket type plugs with LT1 heads?
I believe the advantage is that those plugs have a recessed tip which is supposed to reduce detonation and let you run more timing.
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Old 03-03-2006, 05:23 PM
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Re: Gasket type plugs with LT1 heads?
Got a response from Lloyd...

I always use them on LT1's and they work great.

I would gap them .035 to .040.

Lloyd
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Old 03-03-2006, 06:08 PM
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Re: Gasket type plugs with LT1 heads?
This is from NGK.com web site.... Not much info.....

racing plug, 14mm, 3/4" reach, 5/8" hex, gasket seat, non resistor, V-power (v-grooved center electrode)

NGK - R-5671-A7
Automotive Fitting:
We do not have an automotive fitting for this part in our database.

As for www.ngksparkplugs.com the official site to late to call to find out any info...

Technical Support
hours: 8:30am - 5:00pm Monday-Friday EST
tel: 1-877-473-6767 prompt #2
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