V-groove to R45TS Plugs - Hot Rod Forum : Hotrodders Bulletin Board
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Old 03-06-2011, 05:55 PM
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V-groove to R45TS Plugs

I just pulled the NGK plugs and replaced them with Delco R45TS plugs because the NGK plugs have a 1/8" or so shorter reach and barely make it into the combustion chamber. The reach on the 45s is much better. The truck runs much smoother with the new plugs. The old ones looked pretty good and had an even dark brown color. I pulled one of the new plugs after a long run and they are white except for a small brown spot. I have them gapped at .45 and am using a MSD Ready to Run distributor with 40,000v coil. Is the gap too wide? Would .40 be better?

I will need a couple of header plugs or I might change them all to header plugs. What is the part number for the header version of the R45TS plugs? BTW the NGKs were much shorter and I didn't have any header clearance problems except one plug that I used a heat shield on. What was I giving up in performance with the highly shrouded plugs? I really wasn't expecting much difference with the plug change but it does idle much smoother.

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Old 03-06-2011, 09:55 PM
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ngk

Ngk also makes a plug that crosses to the R45TS so the length or reach is the same and is shorter also, not sure the part # but any NGK parts source should have a cross reference, I know my store does that is why I started using them because they had the same reach and were short for headers. This way you get your performance back and header use.
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Old 03-06-2011, 10:44 PM
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If the reach into the chamber was wrong with the NGK's, you simply had the wrong NGK plug for your application. Not an NGK plug problem, it was an installer error to not notice they were incorrect by comparing to what was being replaced.

White with a faint tan area is how they should look. Tan all over is too rich still if the plugs are recently new, but they will tan up overall with use.
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Old 03-06-2011, 10:58 PM
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It was probably installer error and parts store guy error. The plugs I pulled from the truck that were in it when I bought it were short reach so I was concerned with the longer plugs. Are the NGK 6630s the right plugs?
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Old 03-06-2011, 11:28 PM
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That I couldn't tell you, you'll have to look it up on NGK's web site. I use AC's in daily stuff and Autolite in race stuff.
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Old 03-07-2011, 08:00 AM
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Quote:
Originally Posted by Mertz
It was probably installer error and parts store guy error. The plugs I pulled from the truck that were in it when I bought it were short reach so I was concerned with the longer plugs. Are the NGK 6630s the right plugs?
Ayuh,... What motor, 'n What heads are We talkin' 'bout anyways,..??
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Old 03-07-2011, 08:47 AM
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350 with 333882 heads and ceramic headers.
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Old 03-08-2011, 08:51 AM
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I just picked up a NGK UR4 or 6630 which is supposed to be the equivalent of the R45TS but it also cross references the R44TS and maybe the R43TS so I am not sure about the heat range. The point is that it is about 1/4" plus shorter than the AC so it will work better with the headers. It also has a longer reach and more porcelain showing. I think I am going to use these where it is tight at the header and keep the new AC elsewhere. They are running really smooth in the truck.
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Old 03-08-2011, 10:36 AM
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NGK plugs are certainly great plugs. That is all I could run in my dirt bikes and street bikes. For cars, especially a SBC all I have ever run is AC Delco with zero problems.

Vince
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