1977 Johnson 115 spark plugs

[derekj]

book shows it to use L77J4 , what is the difference between these and L77JC4

 

[tashasdaddy]

Re: 1977 Johnson 115 spark plugs

this is the updated list.
115 1973 - 1979 QL16V Surface Gap or QL77JC4 gapped @ .030

recomendend the QL77JC4 C stands for copper, Q is quiet, for electronics.

 

[derekj]

Re: 1977 Johnson 115 spark plugs

so your saying the L77JC4 is the correct plug