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.
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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