Will This Work?

[KingTriEye]

So I ordered new plugs, wires, and coils from Rock Auto. The wires and plugs came in today. I order the platinum plus plugs and they sent me Bosch Platinum IR Fusion, aparently a better plug.

I normally wouldn't complain at this time, but what i received was 4 plugs that are part 4504 and 4 plugs that are 4505. Is there going to be a difference here? I'm assuming that there has to be a small difference in them.

Thanks

 

[KingTriEye]

I just looked at sparkplugs.com and it looks like the only thing different is the heat rating? However it has the gap listed at .40 Does this make any sense?

 

[SoNic67]

No, it doesn't. I wouldn't use different spark plugs.

I did a lot of research and the only acceptable spark plugs that I found where Autolite XP104. They match the temperature rating of the originals in my V8. I WILL NOT use Motorcraft type since three of them broke off when I tried to replace them - and now they are not even make the original type because of the faulty design.

PS: Heat range is very important. Bosch are too hot for most of the cars - the "IR fusion" ones worked in my Mercury Sable, but not in my wife's Hyundai Sonata. I heard that they don't work good in the V8 5.0L either - they didn't look right for me either.