Changing spark plugs 5.0 L engine

[drjbhm]

I recently bought a 2001 SeaRay with a 5.0L EFI engine. I want to change the spark plugs. I've done this with cars for decades but never with a boat. What type of plugs do I need and do they need to be marine plugs or will car plugs work? I've been looking for an answer and can't seem to find it. Also, are there any problems I need to look out for? I suspect the back plugs may be a little difficult to get to , but I imagine its not too bad. I'll take an extension and a universal joint attachment. Any help is appreciated.
Thanks,
Jack

 

[MikDee]

I suggest AC-MR43T, spark plugs. 43 is the normal heat range for these engines, but they do come in (hotter) 44,& 45 heat range. They are also available in long thread if your engine has Vortec heads, it may require the MR43TS. They are made of alloy, so they'll never rust, plus they have the largest center electrode of any spark plug I've ever seen! Possibly for a strong, sure, spark.

They're usually the recommended spark plug by Mercruiser.

 

[Bt Doctur]

Doing this will save you from breaking the plugs