Confllicting spark plug info

[fuzzybob]

The engine is a 4.3 LX Mercruiser webber carb serial # of 073363. Looking to replace the plugs but in service manual #18 in sec 4 b-4 it calls for Champ RV8c gapped .035 and in sec 1 b-7 it calls for Champ RV15yc4 gapped .040 I'm not sure which of the two to buy. Thanks Fuzzy

 

[bpmcl00]

Re: Confllicting spark plug info

The engine is a 4.3 LX Mercruiser webber carb serial # of 073363. Looking to replace the plugs but in service manual #18 in sec 4 b-4 it calls for Champ RV8c gapped .035 and in sec 1 b-7 it calls for Champ RV15yc4 gapped .040 I'm not sure which of the two to buy. Thanks Fuzzy

good day fuzzy,

i would go with either NGK br6fs or AC-mr43t, iv heard bad things about champion and autolite.

i gap at .040

 

[Gary H NC]

Re: Confllicting spark plug info

The AC MR43T always worked great for me.That should have been what was in it originally....