Dedicated to the Promotion and Preservation of American Muscle Cars, Dealer built Supercars and COPO cars. |
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#1
10-19-2025, 07:25 PM
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I use: NGK 2635 GR4 V-Power Spark Plug
for my 1968 L78 Not a tapered set up. There must be a tapered version.
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69 Los Z11 68 SS/RS 396/325 68 Los Z28 
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#2
10-19-2025, 07:36 PM
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I used recommended brands like AC, Autolite, Champion. All would foul after a short time of use. Changed to NGK and no problem.
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Richard 1967 Camaro SS 396/375 4K 2002 Camaro 35 Anniversay Z4C-WU8
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