Almost free-high flow GM truck air filter - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**PICKMUP** · 08-30-2006, 10:43 PM

I found a couple air filters off GM trucks that are a lot larger than ours and fit on 4bbl qjet & others.
The 2.25" small one is off our trucks up to 72. Notice how small the inlet hole is also.
Next 3.25" is off a 73+ GM truck. The inlet is also much bigger.
The last one is 5.25". I found one of these big ones in the back of a late 70s-early 80s truck in wrecking yard...no engine, so I am not sure of the application, but it was $5. Then I found another at a swap meet with a K&N filter all for $10. Still don't know exactly what they came on, but see, they are almost free, when you find them. My 79 454 dually only came with the medium sized one, but It is getting the bigger one!
I put the medium sized one off my 454 on a 402 I am driving.

**PICKMUP** · 08-30-2006, 10:52 PM

The medium & big ones had a flex hose that brought fresh air in from the radiator support area.
Look at the inside of the big one. Some of you smarter 73+ guys are going to have to explain this one. It looks like a double filter, but the inside one does not go all the way to the top lid???.
I thought someone added it and it may be restrictive, so I pryed it off on one of them. It was just glued in. It looked like it was metal screen on the outside with ground up charcoal inside. Make any sense? What is it? What does it do?

Bob Moore · 08-31-2006, 01:10 AM

Frank - IIR the tall one MAY be diesel. I have seen some of the tall ones and think they may be later model diesels.

Cheesewagon · 08-31-2006, 01:14 AM

That large one is what my '85 C10 had on it. That metal screen on the inside is some sort of spark arrestor. Your right it's glue on and when I took mine off it seemed to breath much better. I still like the looks of the early smaller ones for our trucks though.

Latter Tom

**Canadian694x4** · 08-31-2006, 01:40 AM

Could the larger one have been on the tall deck big block C50 and up trucks? Seems to me as tho that would look right at home on the top of those motors...

wibilly · 08-31-2006, 02:14 AM

the po already instaled one of the tall ones on my 71. i was thinking of going one step further and making it a duel snorkel. my guess on the inner element is that it was a silencer of some sort but just a guess

GREASEMONKEY72 · 08-31-2006, 02:36 AM

i have the middle one on mine but i fliped the lid upside down

**special-K** · 08-31-2006, 07:55 AM

I was thinking the big`un looked like a med.duty app.,like a 366.I like the idea of one of these on my 4wd.

Robert1970C20rstbukt · 09-01-2006, 12:13 AM

My Dad's all original 1985 Suburban has the big air breather on it. I have the stock type on my truck with the snorkel cut off about 1.5" from the breather. The diesel breathers are completely different if I remember right, been awhile since I've seen an 80's GM truck with a diesel.

08-30-2006, 10:43 PM	#1
PICKMUP "Trucks with Class" Join Date: Jul 2000 Location: OLYMPIA, WA, USA Posts: 8,144	Almost free-high flow GM truck air filter I found a couple air filters off GM trucks that are a lot larger than ours and fit on 4bbl qjet & others. The 2.25" small one is off our trucks up to 72. Notice how small the inlet hole is also. Next 3.25" is off a 73+ GM truck. The inlet is also much bigger. The last one is 5.25". I found one of these big ones in the back of a late 70s-early 80s truck in wrecking yard...no engine, so I am not sure of the application, but it was $5. Then I found another at a swap meet with a K&N filter all for $10. Still don't know exactly what they came on, but see, they are almost free, when you find them. My 79 454 dually only came with the medium sized one, but It is getting the bigger one! I put the medium sized one off my 454 on a 402 I am driving. Attached Images

08-30-2006, 10:52 PM	#2
PICKMUP "Trucks with Class" Join Date: Jul 2000 Location: OLYMPIA, WA, USA Posts: 8,144	Re: Almost free-high flow GM truck air filter The medium & big ones had a flex hose that brought fresh air in from the radiator support area. Look at the inside of the big one. Some of you smarter 73+ guys are going to have to explain this one. It looks like a double filter, but the inside one does not go all the way to the top lid???. I thought someone added it and it may be restrictive, so I pryed it off on one of them. It was just glued in. It looked like it was metal screen on the outside with ground up charcoal inside. Make any sense? What is it? What does it do? Attached Images

08-31-2006, 01:10 AM	#3
Bob Moore Registered User Join Date: Feb 2004 Location: Tacoma WA Posts: 1,365	Re: Almost free-high flow GM truck air filter Frank - IIR the tall one MAY be diesel. I have seen some of the tall ones and think they may be later model diesels. __________________ 67 C-20 LWB, tilt, speed alert, vac, 454, T400 67 C-10 SWB, factory air with more to follow

08-31-2006, 01:14 AM	#4
Cheesewagon Senior Member Join Date: Jan 2002 Location: Perrysburg, Ohio, USA Posts: 409	Re: Almost free-high flow GM truck air filter That large one is what my '85 C10 had on it. That metal screen on the inside is some sort of spark arrestor. Your right it's glue on and when I took mine off it seemed to breath much better. I still like the looks of the early smaller ones for our trucks though. Latter Tom __________________ '91 suburban 350 TBI - R 700 4 new daily driver '72 Cheyenne Super 49,000miles 350/350 frame up resto w/ matching numbers.

08-31-2006, 01:40 AM	#5
Canadian694x4 Born To Lose Club Join Date: Feb 2003 Location: Calgary, Alberta/Oxenden, Ontario, Great White North Posts: 13,308	Re: Almost free-high flow GM truck air filter Could the larger one have been on the tall deck big block C50 and up trucks? Seems to me as tho that would look right at home on the top of those motors... __________________ Brian Smith - "Born To Lose" 1969 Chevrolet K10 LWB Fleetside - Proud Owner For 22 Yrs - 1 of 208 Built & Sold In Canada!- 283 V8/350TH/NP208, 2" All Spring Lift, 32" Good Year MT/R's. 1972 GMC K2500 Custom LWB Fleetside - Proud Owner For 3 Yrs - 1 of 571 Built & Sold In Canada! - 350 V8/SM465/NP205, 4” Rough Country Lift, 33” Interco TSL Thornbirds 2007.5 GMC Sierra SLE 2500HD 4x4 - Proud Owner For 17 Yrs- 6.6L V8 Duramax Diesel/Allison 1000, 2" Lift, 33" Mickey Thompson MTZ's. 2008 Yamaha Raptor 700r - Proud Owner For 15 Yrs - ITP Mud Lites. 2015 John Deere 1025R - Proud Owner For 8 Yrs - 24HP Diesel/H120/54D/260B/SB1154.

08-31-2006, 02:14 AM	#6
wibilly Senior Member Join Date: Nov 2005 Location: northwestern wi Posts: 2,111	Re: Almost free-high flow GM truck air filter the po already instaled one of the tall ones on my 71. i was thinking of going one step further and making it a duel snorkel. my guess on the inner element is that it was a silencer of some sort but just a guess __________________ common sense isn't so common anymore

08-31-2006, 02:36 AM	#7
GREASEMONKEY72 Registered User Join Date: Aug 2006 Location: Bakersfield,CA Posts: 7,893	Re: Almost free-high flow GM truck air filter i have the middle one on mine but i fliped the lid upside down Attached Images __________________ -steven Alte Seele S.S. "Allison" '72 C/10 LWB 350SB/TH350 - DD PITBULL IS NOT A CRIME

08-31-2006, 07:55 AM	#8
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,852	Re: Almost free-high flow GM truck air filter I was thinking the big`un looked like a med.duty app.,like a 366.I like the idea of one of these on my 4wd. __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~

09-01-2006, 12:13 AM	#9
Robert1970C20rstbukt Registered User Join Date: Jun 2004 Location: Beeville, Texas Posts: 1,943	Re: Almost free-high flow GM truck air filter My Dad's all original 1985 Suburban has the big air breather on it. I have the stock type on my truck with the snorkel cut off about 1.5" from the breather. The diesel breathers are completely different if I remember right, been awhile since I've seen an 80's GM truck with a diesel. __________________ RJD 1984 Chevrolet C30 welding truck 454/SM465 1977 GMC C15 pickup 350/TH350 1970 Chevrolet C20 pickup 350/TH400 1970 Chevrolet K20 Suburban 454/TH350 1969 GMC 8500 478M V6/5 spd winch truck

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