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  #11  
Old 05-23-2017, 10:46 AM
Carolina Tee Bird Carolina Tee Bird is offline
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Can't tell you any more about the engine other than it was rebuilt by a professional shop around 8-10 or so years ago. Unleaded fuel was certainly used then but can't tell you if modifications were done to accommodate the fuel change.Today, there is 10% or more of ethanol added. The very few gas stations that still offer a leaded fuel show 87 octane. I would rather add a lead additive rather than search for gas stations with leaded fuel (if that's what's recommended) as I drive this car on short trips; not just around town. As mentioned before, engine seems to run OK with exception of erratic idle when very hot. The fouled plugs were dirty prior to the tuning, so not easy to say if the plugs continue to collect carbon. Still think a plug change is in order before further tuning.Checking new plugs after 2,000 miles would indicate further problems. Soooo back to what kind of plugs would you put in this engine? Thanks
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  #12  
Old 05-23-2017, 08:48 PM
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I would stick with the stock heat range plugs for now. I've never gotten hung up too much on brands. To me any name brand plug should be good for at least 50,000 miles on an engine that doesn't have any serious issues. Assuming that your carb and timing have been properly adjusted I would give it at least 1500 miles before I would consider going to a hotter or cooler plug.

John
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  #13  
Old 05-23-2017, 10:13 PM
Yadkin Yadkin is offline
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Quote:
Originally Posted by Carolina Tee Bird View Post
...engine seems to run OK with exception of erratic idle when very hot....
If it's overheating that's a whole other issue.
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  #14  
Old 05-24-2017, 07:48 AM
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The shop manual for a 352 ci engine states Champion No F-11-Y
I use NGK APR 6 FS
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Old 05-24-2017, 11:18 AM
Carolina Tee Bird Carolina Tee Bird is offline
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Thanks all.....
John: Is the Motorcraft BSF 42C a stock plug that would be appropriate?
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  #16  
Old 05-24-2017, 11:48 AM
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Yes, that is the correct Motorcraft standard copper plug. I believe now it's called an SP420. Other plugs are Champion 22 (RF11YC) and Autolite 45. All those plugs were original equipment plugs that were used in FE motors (352 and 390).

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  #17  
Old 05-24-2017, 12:00 PM
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Sorry John, I didn't see you posted first.

Quote:
Originally Posted by Carolina Tee Bird View Post
Thanks all.....
John: Is the Motorcraft BSF 42C a stock plug that would be appropriate?
Yes, that's a stock plug for your 390.
Other choices include:
AC Delco R83TS
Autolite 45
Autolite AP45 (#AP45DP2 - Platinum)
Champion 22 (RF11YC)

BTW, know what "AC" stands for?
ALBERT CHAMPION. Yep, same guy.
GM got his company after ol' Albert collapsed and died suddenly at age forty-nine in his suite in the Hotel Meurice after being punched by his wife's married lover in the Hotel Crillon.

Champion left his widow $15 million. Then, GM bought the majority of his company stocks from the grieving widow. Kinda makes you wonder who the winner of this story is. - Dave
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  #18  
Old 05-24-2017, 12:28 PM
Carolina Tee Bird Carolina Tee Bird is offline
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Thanks Guys, on the way to AUTOZONE!
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