Review on ACDelco R46SZ Professional Conventional Spark by Bill Lacy
Very happy with the super setup and more than doubled.
Tried many different spark plugs in a 1979 409 Olds engine. After checking which spark plugs were offered by the new ones, I tried these stock Delco ACs. I'm very happy with the Super setup and have more than doubled my 10mpg fuel economy.
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- Ignition Parts
Cons
- Replacement Availability
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