Short life for spark plugs, 429 SCJ

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Joined
Jul 14, 2010
Messages
765
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110
Location
St. Petersburg, Florida
My Car
1971 Ford Mustang Mach 1, 429 Super Cobra Jet, 4.11, Detroit Locker
My 429 SCJ is completely rebuilt, everything is computer balanced; new 11.3.1 forged pistons, 0.40 oversized bore, Cam Research cam, polished but not turned nodular crankshaft--maintaining STD dimensions, SCJ rods with new bolts, Crane Roller Rocker arms with poly locks, hardened push rods, heads lightly portered to clean up castings, all new associated valve train parts, etc. Use combo of 101 octane and 94 octane ethanol free fuel. 

Despite the newness, it chews up a set of Motorcraft spark plugs in a hurry. I drive it 2-3 times per week on short hops for errands. But after 250 miles, it needs new plugs--old ones get fouled in a hurry.

Anyone else have the same experience? Recommendations for better plugs? 

Thanks, tim

Mach 1 1971 429 SCJ OK stamp July 2020.jpg

 
I'd verify that the timing and curve are correct first. If they are correct I'd find out why the carb is running rich (blown power valve, wrong calibration, float level too high, etc.).  Chuck

 
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