best spark plugs

[jarata]

I have a mercrusier 3.0 stern drive the plug it says to use is the ac-delco MR43T does anyone know of a better plug cross referenced or is this plug fine

 

[ArkBoater]

Re: best spark plugs

I have a mercrusier 3.0 stern drive the plug it says to use is the ac-delco MR43T does anyone know of a better plug cross referenced or is this plug fine

You are going to get a lot of opinions on this one. I just replaced mine (in mercruiser 3.0) and the previous owner had Champions in it, and I replaced it with NGKs. Good luck.

 

[jaxnjil]

Re: best spark plugs

what the OEM instaled new

 

[tashasdaddy]

Re: best spark plugs

i agree the engine was designed to run on a praticular plug. run what it was designed for.

 

[Scaaty]

Re: best spark plugs

Never had a problem with the AC's in my 350 (called for).
I seem to have terrible luck with Champs in the Harleys, (fine for the lawn mowers)
I have become a heavy fan of NGK though. Run fine Harleys and dirtbikes, the small outboards.
NGK BR6FS is the AC/cross..
A chart..
http://www.clubplug.net/cross.html

 

[dave4151]

Re: best spark plugs

I've been using NGK BR6FS in place of ac-delco MR43T for 3 years and haven't had a problem.​

 

[PhatboyC]

Re: best spark plugs

I have OEM now but my next set will be NGK Iridium's. Simply for longer change interval.