Different spark plugs for '95 Prizm & '95 Corolla??????????????

[redgtxdi]

OK, this one threw me for a loop.

Picked up some Denso Q16PR U-11 this morning for my prizm.

The ones I pulled out were K16R U-11 (???)

So I go onto Denso's website & look up for both cars.............

Sure enough..........Corolla gets the ones I pulled out & Prizm gets the "Q" series with the "P" in it.

What the heck is up with that??? (And, yes, they look different)

[redgtxdi]

Here's a pic...........



http://img307.imageshack.us/img307/3922/img31300mo.jpg

Notice how the core sits up higher on the K series than the Q....(on the Q you can hardly see any white at all) All in all I'd guess that the K's are maybe .050" to .100" taller end to end.

I don't know what the he// Toyota was doin' here. Obviously either spark plug will work, 'cuz the K's were obviously in this motor for a long time.

So why the he// would Toyota do this???

A 4A-FE is a 4A-FE, ain't it??