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Old Aug 23, 2009 | 10:22 PM
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highoctane74's Avatar
highoctane74
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What spark plugs?
I have a 77 400. Which plugs run the best in it? My 351 has Autolite 25's. Will they work?
 
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Old Aug 28, 2009 | 04:30 PM
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53fatfndr
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Those will work. A 26 would be a hotter plug, 24 would be colder. I'm running full MSD ignition system in my warmed over 410 in my '53, and I run 24s. I run 25 copper core Autolites in my stock '79 400.
 
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335 Series- 5.8/351M, 6.6/400, 351 Cleveland
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