1989 Merc 5.7L spark plugs??

[Greg68S]

I figured that since I pulled my engine to do manifolds, risers, and a water pump I would do plugs and wires. I pulled out champions. Is this correct? What spark plugs should I use? This is my engine serial number 0C664458.

 

[Don S]

Re: 1989 Merc 5.7L spark plugs??

Champions are never the correct choice for a boat. Too many failures. They do seem to work OK for lawn mowers.

You need the AC-MR43T or NGK-BR6FS
Gapped at .035"

 

[Greg68S]

Re: 1989 Merc 5.7L spark plugs??

Thank you very much. Good to hear they hadn't failed they did rust badly though

 

[Greg68S]

Re: 1989 Merc 5.7L spark plugs??

Will standard plug wires be ok or not? If not, which plug wires should I buy?
-Thanks

 

[Bondo]

Re: 1989 Merc 5.7L spark plugs??

Will standard plug wires be ok or not? If not, which plug wires should I buy?
-Thanks

Ayuh,... Standard plug wires are just Fine,...

Marine sets are generally much Longer than an automotive set, 'n many times the ends are different...