Spark Plugs and Gap for 1995 Mercruisers 7.4 (454)

[diver94]

Hi, I recently bought a 1995 Sea Ray 330 with twin inboard Mercruisers (MIE 7.4) 454s. The engine cover says that the spark plug is the AC-MR43T (035 gap). But they dont have those plugs at the local Autozone. Is there any other spark plugs you recommend? Some people dont like to change when it comes to marine engines.

Thanks,
Lui

 

[alldodge]

The gap is .035
The M part of the plug number is for marine and this means it has a nickle coating to help prevent rust.

Other plugs would be
Champion RV15YC4
NGK BR6FS

I have the same motor in my Rinker and had original Champion plugs until about 3 years ago and they were still good when removed

 

[Scott Danforth]

Napa would have the AC Delcos
the NGK's are a better plug

 

[diver94]

The gap is .035
The M part of the plug number is for marine and this means it has a nickle coating to help prevent rust.

Other plugs would be
Champion RV15YC4
NGK BR6FS

I have the same motor in my Rinker and had original Champion plugs until about 3 years ago and they were still good when removed

Got it...THANKS!

 

[diver94]

Napa would have the AC Delcos
the NGK's are a better plug

Done..ordered them NGKs. THANKS!

 

[alldodge]

the NGK's are a better plug

Says one man's opinion