AC Spark Plugs

[DennyDen]

Hello All.....I have a 1988 Mercruiser 5.0 with thunderbolt lV....Last year I change my spark plugs Using AC Delco # MR43T Plugs........This Year The Mercruiser Parts Dept Told me that I should be using # MR43LTS Plugs....The LTS Plugs are longer than the 43T's...Just doesn't seem right to me....I Don't want to damage the Motor......Anybody Idea.....Thank You

 

[Bt Doctur]

Re: AC Spark Plugs

Using a longer reach plug may contact a piston top, not beneficial to the plug or the piston.

 

[Don S]

Re: AC Spark Plugs

It's not right. Your engine needs the MR43T, not the LTS. Your parts guy must be related to ours. Doesn't have a clue.

 

[TilliamWe]

Re: AC Spark Plugs

MR43T is the correct plug for your engine.

MR43LTS plugs are for engines with VORTEC heads. Those heads didn't come out until 1995-96.

 

[Fun Times]

Re: AC Spark Plugs

Hello All.....I have a 1988 Mercruiser 5.0 with thunderbolt lV....Last year I change my spark plugs Using AC Delco # MR43T Plugs........This Year The Mercruiser Parts Dept Told me that I should be using # MR43LTS Plugs....The LTS Plugs are longer than the 43T's...Just doesn't seem right to me....I Don't want to damage the Motor......Anybody Idea.....Thank You

You should consider reporting that parts guy to the manager, So that he will not have a chance to damage a bunch of engines at the dealers cost.

 

[DennyDen]

Re: AC Spark Plugs

Thanks Everyone for the help......I new it wasn't right......