Silverado Desperado

Will a ZR1 stock air filter fit in a stock LS3 housing?


Are the ZR1 and LS3 air filters interchangeable?


Does the ZR1 stock air filter flow as well as a K&N LS3 air filter kit that comes with the K&N air filter housing?

HOXXOH

No, No, and No.
K&N flows good, but filters poorly.

Silverado Desperado

Are the ZR1 and Z06 air filters interchangeable?


Does the ZR1 air filter only fit a ZR1?

RicK T

I hate to contradict HOXXOH but.......:

This is a heck of a discussion and I encourage you to read all of it:

http://forums.corvetteforum.com/c6-t...same-pics.html

HOXXOH

No, and Yes.

No need to hate there Rick. I based my answer primarily on post #80 and that the PN's changed along with the pricing. Initially the LS3 and LS7 filters were different, but after the LS9 was introduced, GM settled on the same one for both and a slightly different one for the LS9.

Steve_R

The more salient question is whether changing from the stock LS3 filter to the ZR1 or K&N filter will yield any real advantage for a stock LS3 motor. The answer is no.

CaryBob

HOXXOH

If changing from a LS3 filter to a K&N and the quest is to introduce more dirt into the engine, then the answer is yes. The Donaldson filter is far better at filtering out dirt.

Steve_R

Yup, no way I'd put a K&N on mine.

RicK T

Oh boy. I guess I messed that up.

My comment wasn't directed AT YOU, HOXXOH. But I can see now how it could be interpreted that way. I guess I should have written something like "I hate to contradict what HOXXOH says, but".

Oh well. One more lesson about thinking and typing. Thanks for taking it the right way.

C7/Z06 Man

The truth will set you free.

I for one will aways stand up for what "I" believe. If the "facts" show me to be wrong than I will "finally" admit it.

HOXXOH does not agree with you Rick, he agrees with post #80 in the thread that you posted from what I gather here. I now have read the thread you posted Rick and it looks to me that the ZR1 filter will work from what I have read although the sealing of the ZR1 filter does not seal to the housing in the same way as an LS3/7 filter would.

Someone send me a new ZR1 filter to try and I will give you my insight!

HOXXOH

I knew what you meant, but I was just kidding with you, as shown by the

HOXXOH

Maybe I needed to qualify my "No". When I meant those filters aren't interchangeable and/or don't fit, I mean they aren't 100% physically the same size. Yes, you can force a LS9 filter in a LS3/LS7 housing and a LS3/LS7 filter will fall loosely into a LS9 housing, but neither fit correctly. Same difference applies to us swapping wheels. Your GS and my base have the same bolt pattern and diameter, but they're not interchangeable.

C7/Z06 Man

From what "I" understood from that thread is that an LS3/7 filter "cone/paper" (need to check mine) is not really a tight fit in its own housing much less the ZR1 housing; but the ZR1 filter cone is a tight fit in a LS3/7 housing and the ZR1 filter cone/paper is not really being compressed in the LS3/7 housing according to the thread.

I'm still open to that ZR1 filter donation.

Silverado Desperado

So...eventhough they are different...

Does the ZR1 air filter fit well, and seal properly in a LS3 & LS7 air filter housing?


Does it result in better performance and filter dirt better?



.

TLS_Addict

How much power are you making?

If not more than 600 I would say stay with what you have.

C7/Z06 Man

Good point.

What I would of liked to see in post#80, etc. is the ZR1 filter next to or being inserted into a LS3/7 housing. Bringing the two together would of really helped to decide i.e. depending on what it looked like.

EDIT: Another point that I would like to make from my track experience. I have seen cars at the track running air filters that are rated way above what their carburetor will flow yet "a lot" of the time they will pick up if the air filter is removed. Using common sense it would tell most that the picture is not always as simple as flow ratings. That is why testing is a good thing. Hell I read that the educated "knew" the world was flat and if you believed otherwise you were an "IDIOT". Is someone sending me a filter yet!

C7/Z06 Man

I wanted to see what the ZR1 Air Filter Part# 25940997 was going for on GMPARTSHOUSE.COM and to my surprise they have that number listed as fitting the LS3/7 & LS9/ZR1; WOW! It looks like a good bet that it will fit the LS3/7. Check it out.

rgeorge33

I've noticed the same thing on both GM Parts House and Parts Taxi. I can't remember where I read it, but I recall reading something that stated GM changed the filter for the LS3 and LS7 to the same element as the LS9 for model year 2012. The reasoning was supply chain uniformity and the slight increase in effeciency of the LS9 filter helped offset the additional set of cats in the exhaust for the 2012s (total of 4 in 2012). According to the source, which I can't remember or confirm right now, that was one of the reasons that the 2012 LS3 is still rated at a base 430 HP despite the extra cats. I haven't had a chance to pull the stock filter on my 2012 GS (still in Afghanistan), but I'll confirm when I get home in a couple months.

C7/Z06 Man

Stay safe & GOD speed.

Keep that head on a swivel.