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Mar 10, 2008 | 01:47 PM

brownfoot

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spark plugs

posted on engine forum, will try here too

recommendations for spark plugs:

76 F-250 390 (was 360) with Stock Duraspark, 4bbl 600 Edlebrock and Performer intake, long tube headers, CR over 9.5:1, have to run 93 octane

only 15k on rebuild and only gets driven less than 1000 miles/year

the Motorcraft BSF42C have been in it since rebuild and it may not hurt to change them.............Autolite 42 is a crossreference, any comments?

Mar 10, 2008 | 02:19 PM

Mil1ion

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They are fine but I use Bosch or NGK dual fire or AC plugs in my 429
The engine likes AC plugs just fine.

I find Autolite's wear out too fast.

Mine are 45's though.

Mar 10, 2008 | 02:31 PM

brownfoot

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fingers aren't working..........Autolite 45 is what I plan to get

Mar 10, 2008 | 03:16 PM

pdqford

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From: Central NYS

Quote:

Originally Posted by brownfoot

76 F-250 390 (was 360) with Stock Duraspark, 4bbl 600 Edlebrock and Performer intake, long tube headers, CR over 9.5:1, have to run 93 octane

Might want to take a close look at the insulator color - you might be able to come down a couple of heat ranges and get away with a lower octane fuel(especially if you don't run any kind of an EGR). Just my thought..............

Mar 10, 2008 | 08:17 PM

brownfoot

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no EGR, what color would let me go cooler, and what would the plug numbers be
btw, the plugs have just a little light brown color

Mar 10, 2008 | 09:05 PM

Bullitt390

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Autolite 45
Champion RF11YC OR RF9YC

Mar 10, 2008 | 09:34 PM

pdqford

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From: Central NYS

Quote:

Originally Posted by brownfoot

no EGR, what color would let me go cooler, and what would the plug numbers be
btw, the plugs have just a little light brown color

My experience is that when you take away the EGR, combustion temps climb. Without a slower advance curve, it takes more octane to keep the pinging away. Look for a ring around the insulator. If its near the center of the insulator, its pretty close. If not, try a couple of heat ranges cooler and see where the ring is.

I don't know what the number of the plug would be. Perhaps your plug's web site may have the heat range numbers.

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Mar 10, 2008 | 10:36 PM

wedefyu

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From: Southeast Iowa

If I may chime in, I work in Burlington, Iowa at the Champion Spark Plug facility, buy Champion, we're proud of the good products we produce, and you're money with stay on this side of the ocean.

Mar 10, 2008 | 10:52 PM

#10

Bullitt390

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For what its worth, even 487 Cubic Inch, all iron, FE drag race engines still use Autolite 45s or Chapion RF9YC.

No need to F*%# with heat ranges with an everyday motor.