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Old 08-03-2010, 05:58 PM
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Spark Plug question

Hi Guys
First let me start by saying I looked back in the other threads to try and answer this question but had no luck. Ok, I have a 1969 427 512 block bored and med. cam. The heads are 1974 Number 346236 and I am not sure what have been done to the heads. They where on the motor when I got it and I have not taken them off. It did not come with plugs so I placed R44T plugs with 45 gap in it. It runs good but when I checked the plugs they looked like they were running cold. Ready to run MSD dist. and blaster II coil. Do I have the right plug, or is the gap wrong? Thanks guys!

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Old 08-03-2010, 06:57 PM
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plugs

Running cold? how did you come up with that?
Plug heat ranges are not to make the spark hotter or colder, it has to do with the cooling of the plug, cold plugs are for racing and better cooling.
If the plug is whitish and it runs good, leave it alone.
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Old 08-03-2010, 07:27 PM
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After taking the car out for a couple of short runs I pulled the plugs and they looked carbined up, "Black not white tips". Looked like a motor that is running to rich. I just wanted to make sure that I was not missing something. It just might be that it needs to break-in more. Thanks
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Old 08-04-2010, 01:01 PM
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plugs

Not knowing all about the engine you may have issues.
If you put 1000 miles on it without fouling plugs but it uses oil then you may have ring or guide problems.
Carbs running rich should smoke all the time.
It is hard to say at this point. Carbon build up is from oil and where it is coming from is not always easy to figure out. A leak down test may show if rings are sealing.
If you drive somewhere and after 10 sitting minutes have someone start it and see if it smokes for a minute and clears up. If so you have a valve guide problem.
Msd will not help this.
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Old 08-05-2010, 04:59 PM
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Sorry it took so long to reply. Had a bad storm and electric was out till today.
I know it is hard to fix something that you have never seen or know nothing about. What I was looking for was to find out what plugs others are using in there 1974 heads. I didn't want to put a plug into the top of the piston or something. I did do what you recommended and took the car out for a short drive on the back roads. (Have no lights or hood yet) I ran it hard and it ran like a sick dog. Brought it back home and after about ten minutes of sitting had my wife start it so I could look for smoke. There was not smoke. It has new headers and I notice that the number 5 cyl. tube did not burn the paint off yet like the rest. So I pulled the plug and it was cracked. Continued to take the rest out and found that 4 cyl. was also cracked. Went and bought new plugs. (Again) and replaced them all. Checked the timing and it was off. Maybe because I set it with bad plugs. Placed it at 38 total BTC and it sounded strong. Took it back out and it was like being in a different car. More power then I thought it would ever have. Come home and after it cooled down checked a couple plugs. Much better color, grayish white with no carbon. I think it is going to live!! Thanks
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Old 08-05-2010, 08:50 PM
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spark plugs

i also have a 427 i run ac delco r43ts with .35 gap try that ive tried 42 43 44 and 45 the 43 works best for me.
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Old 08-05-2010, 10:04 PM
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Thanks for the reply. I will try ac delco r43ts with .35 gap. Are you also running 454 heads?
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Old 08-07-2010, 05:39 PM
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Quote:
Originally Posted by hcmengines

Running cold? how did you come up with that?

Plug heat ranges are not to make the spark hotter or colder, it has to do with the cooling of the plug, cold plugs are for racing and better cooling.
Common Sense Maybe?

How do you find the correct heat range? That is what the poster is asking.

-SPARK PLUG HEAT RANGES-
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Old 08-07-2010, 07:22 PM
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Thank you very much for the link you sent about plugs. It is very helpful, and what I was looking for. It will help a great deal !!
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Old 08-08-2010, 08:37 AM
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Quote:
Originally Posted by oldtimercarnut

Thank you very much for the link you sent about plugs. It is very helpful, and what I was looking for. It will help a great deal !!
You are quite welcome. I stumbled across that on a quick GOOGLE. There are more definitive pages on the subject.
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