What plugs are you running in your 496's?

I prefer NGK, but which type is best? G-Power, Iridium or Platinum

They call for an AC 41-983 plug. I would just have the parts store cross ref. and see whats available.

John S.

Thanks John, I was really looking to see what plugs people are running other than the stock AC's.

What is the NGK stock #?

autolights are pretty nice if you cant get ngk

The NGK plugs are;
TR55, Standard plug
TR55GP, G-Power
TR55IX, Iridium
PZTR5A-15, Platinum

We have in stock about 200 of the AC 41-983 platinum plugs for the 496's and we sell them for $40 a set of eight plus UPS if anyone needs them.

Ray @ Raylar

What is your (not Merc's) recommended change interval?

Okay, I'm going to be pulling a couple just to check their condition and gap. If they look worn (211 hours) I'll buy two sets.

Our recommendation on platinum tipped plugs in these new engines is if you expierence a change in the way the engine normally operates or has a hard start or misfire then remove the plugs to check them. If the engine is running normal and good - DON'T FOOL WITH THEM! If you remove them, they normally should have a light tan insulator and the shell should be a gray color without a lot of heavy carbon or oil deposits. If you have oil or fuel wet plugs or heavy deposits this points to a problem other than the plugs. If the plugs look normal then use a tooth brush and not a wire brush and some alcohol or solvent carefully clean the tip and the threads and then blow dry. If the gaps are still around .060 to .065" these platinum tipped plugs should last a thousand hours or so unless damaged or erroded. Put a small amount of oil on the threads only and re-install, being careful not to overtorque or crack the insulators. If you have a misfire in any cylinder or a plug that's been removed and looks wet and un-fired then I would replace that plug just for good measure and check the compressionin that cylinder or fuel and spark system (injectors,wires, coils, etc.).It's kind of like the old saying. "IF IT AIN"T BROKE, DON'T FIX IT"

Regrads,

Ray @ Raylar