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I have 347 Sbf with 205 afr heads. In foxbody street car with c4 and 410 gears. Fuel system is Holley black with 10 an line to fuel log with two regs.12-803 on nitrous side. Engine has wet plate system stinger4. Jets N64 F46 150 shot. ? Is how these plugs look with 4 1/8 pass es on them? Flowed 5 psi with Steve flow gauge and timing locked 30 degrees.
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On the bright side you know it must be safe if it still has all the nice sharp edges and corners after 4 passes, but as far as tuning as stated above, gotta shut it down and get all the plugs out after a pass to know anything.
 

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If that was a one pass plug I would say you're way rich. Like said before, New plugs one pass and read. No one can help without info. Good luck.
 

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I would say don't change anything until you get a good look at what's going on with the plug as stated above. Just raising the fuel pressure "because" isn't it......
 
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