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Old 04-10-2004, 11:02 AM
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Right plugs?

I have a mild Chevy 350 - stock bottom end, flattop pistons (8.5:1 CR), 882 heads, Crower 267 HDP (210/214 w/.444 lift), performer intake and 600 cfm (performer) carb. I've been using AC R45TS plugs and I have been told these may not be the correct heat range. Any suggestions would be appreciated.

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Old 04-10-2004, 11:13 AM
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On my 350 I use autolites or bosch spark plugs. When i ran the bosch's in my old car, that thing would blow oil by the piston rings like there was no tomorrow. I would pull the spark plugs out to check them and they would be coated in oil, but they would still fire! still got good gas mileage too! I've heard AC Delco's are not bad, I didn't like them when i ran them but it depends on your setup.
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Old 04-10-2004, 11:22 AM
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No one can honestly answer that question for you on this site unless you post good quality pictures of the plugs. After a normal drive where you let the motor warm up properly, shut it down, let it cool off, pull the plugs and take photos.

What we would be looking for can be found on several sites on the web. An example would be http://www.ngksparkplugs.com/techinf...000&country=US

Look on page 3 of the article.

They sound like too hot of a plug to me, but it really depends on the rest of your set up (carb, timing, engine wear, ...)
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Old 04-10-2004, 11:30 AM
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Visually the plugs are good - I've checked them several times. No easy way for me to post pics of the plugs though (no digi cam or scanner). BTW thats a handy link - I'll have to read it more thouroughly later.
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Old 04-10-2004, 11:34 AM
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With unleaded gas and High Energy Igniton, reading plugs is not as easy as it used to be. Having said that, your set up, especially if you are using composition gaskets, is at stock or slightly lower compression. That (R45TS) would be very close to the right plug for what you have. Use the plug chart to keep tabs on your engine.
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