Re: Which spark plug for 89 OMC Cobra?
Yea thats what I want to use I just cant figure out which one.
When I look up on theyre site I get a bunch of different part numbers.
When you look them up it lists all the OMC engines. If you select 5.7 Cobra you get.
UR4 - 6630 is the regular ones
UR4GP - 2869 is the premium NON Iridium ones
If you click on just 5.7 you get.
BR6FS - 4323 standard plug
And then if you look up Mercruiser ones its all different part numbers. What is the difference if they are all GM engines?
And what is the deal with the resistor? Some of the plugs say Resistor=yes?