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Old 05-21-2011, 06:25 AM
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Spark plugs for Goodwrench 350

I replaced plugs in my SBC 350 last weekend, and at the parts store their parts guide showed stock plugs to be Delco R45TX, gapped at .060. When I was cleaning up my bench I looked at the old plugs and found they were R45TS, which are supposed to be gapped at .045.

Do I need to go back and find a set of R45TS plugs, or will the R45TX work? This is a GM replacement crate engine with stock GM heads, HEI, and only a 194/204 cam and aluminum intake. I'm running about 10-11 degrees initial timing.

Thanks,

Bruce

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Old 05-21-2011, 07:13 AM
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I would go with the R45TS. The difference between the two is the 45TX has a copper core and the tip is recessed more into the plug shell. Depending on how many miles and engine condition the R45TS has an extended insulator and should run a little cleaner. Either way, I would stay away from the .060 gap and stick with the .045. GM backed off that big gap as plug life suffered.
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Old 05-21-2011, 07:34 AM
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That probably explains why the TX plugs were so hard to find in stock. I just relied on the parts guy and his system, since I had not written down the plug numbers before I left home. It sounds like the TX plugs were a very short-lived solution right as GM was switching to HEI in 1975.

If I have trouble finding the R45TS in stock, is there a good alternate brand? Some folks seem to like Autolite or Accel, but I've always assumed the Delco would be the best choice.

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Bruce
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Old 05-21-2011, 08:31 AM
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Colder plug

Get a set of AC Delco CR43TS. They are one step colder than the R45TS and are as common as dirt.
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Old 05-21-2011, 08:42 AM
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I may be wrong but I always though the x was for extended gap
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Old 05-21-2011, 03:38 PM
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Quote:
Originally Posted by MouseFink
Get a set of AC Delco CR43TS. They are one step colder than the R45TS and are as common as dirt.
I think 1 step colder would be R44TS. That's what I run in my 350 crate E and they work real good.
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Old 05-21-2011, 03:44 PM
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You can also get ngk 6630 plugs which is what I used on my older style chevy 350 world sportsman 2 heads. The ngk plugs are a little shorter then the acdelco plugs and I have not had any issues with them. For my experience they are good plugs. Many say champion are bad but I used a set once and they worked fine for me as well or if you want autolite 26 will work as well. Sorry but I don't know the number for the champion plug.
Eric
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Old 05-22-2011, 07:28 AM
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spark plug choice.

Just wondering if you guys know a link where i can get a reference chart for an ACCEL / NGK conversion as the 347 i have has now 7 accel 416 plugs and one broken off stubby plug. (missed with the extractors while fitting) Accel plugs are not available in Aus.
Thanks
Al.
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Old 05-22-2011, 07:37 AM
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Put in you part # and application , conversion and all sorts of info comes up

http://www.sparkplugs.com/
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Old 05-22-2011, 07:59 AM
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Good tip but.

Thanks for the tip. Just typed in Accel 416 and their database shows no listing for Accel.
Accel has 3 or 4 web sites, but they are all in breech of some internet protocol and cannot be accessed here.
have to dig deeper i guess.
Thanks anyway.
Cheers
Al.
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Old 05-22-2011, 08:14 AM
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just did it and i got spitfire conversion. just type in 416 and then see accel conversion. it show spitfire , then punch in the spitfire number and see what conversion it gives you. it gave me NGK and then punch in that number. Use only the number and not the name
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Old 05-22-2011, 06:17 PM
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Plug choice.

thanks for the tip. As you say just using the number and not ACCEL on that website shows a spitfire then to NGK. There is a wealth of information there about heat ranges and applications.
I note the price of $2.89 and the Aus price here is $4.50. Maybe worth buying from that website if shipping costs are low. Definitely worth bookmarking for future ref.
Cheers, thanks.
Al.
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