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Discussion Starter #1
I have a high performance 400 big block with headers and I am looking for the best plugs that will clear my headers and yet wont foul out very easy
 

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AirFuelEddie
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I like the NGK's FR-5's in my BigBlock,(440), but then again I use 5/8 plugs in my alloy heads. What type of Carb, or can you tell us more about the engine combo? If it's a high compression , big cammed 'plant' it might need a colder plug than whats normally used. If it's stock, then Champions or NGK's should do the trick.
 

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Discussion Starter #3
Its a 400 big block 30 over flat top pistons,edelbrock performer RPM intake, a little bit lopey cam, 906 heads, and headers. The choke flap stayed shut and it fouled 3 of the plugs after driving it about 20 miles. I would like to get a 5/8 plug for it cause the 13/16 ones are a little tight fitting. Please help me I need to get it running good before this weekend
 

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Discussion Starter #5
Where Could I buy them? oriellys or auto zone? and about how much do they cost................THATS A VERY NICE CAR!!!
 

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Hemi 4x4/Challenger T/A
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I always ran Autolites in my big blocks, along with the orange box Mopar electronic ignition.
Never fouled a plug, even with the six pak.
 
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