Air filter/cleaner question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

71shortygray · 04-25-2013, 03:27 PM

I have a 71 P10 with an 250 inline 6. It originally came with an offset air cleaner that had a riser/connector tube that went from the carb to air filter house. A hose would run from the side of that connector and into the side of the valve cover (see pic of an example).

Mine is missing the offset air cleaner and connector but still has the hose coming out of the valve cover. So my question is would there be any issues with just taking that hose off and plugging the hole in the valve cover and then putting smaller air cleaner? Found one for that is 6" x 2.5" that will fit the space and carb.

Thanks!

SS Tim · 04-25-2013, 04:10 PM

The hose is the crankcase breather and it uses the carb. inlet to evacuate the crankcase.
While you could just use a breather you loose the positive vacuum effect.
Also the TAC function is lost for warming inlet air by not using the air cleaner assy.

The type of circular air filter that would fit in the space is really too small for the engine. Might want to look at fabricating an elbow similar to the factory rise and cross over the engine to the cold side. Then use a cone shape hose mount filter so popular on cold air inlet kits. In fact a universal kit might be a good start.

71shortygray · 04-25-2013, 04:23 PM

Thanks -- good advice

Rufton · 04-25-2013, 05:53 PM

My Dad ran a smaller filter that that on a 305 V6 for years and it didn't seem affect the mpg or power. It does need changing more often though. Some filters like Wix provides CFM rating on box.

Is there any 3/8" or larger ports on intake to run a PCV?

71shortygray · 04-25-2013, 10:00 PM

not sure -- i may have a line on an offset air cleaner -- will aim get one of those on it. thanks

Rufton · 04-25-2013, 10:46 PM

Quote:

Originally Posted by 71shortygray

not sure -- i may have a line on an offset air cleaner -- will aim get one of those on it. thanks

Pretty impressive you can find an offset breather!

**WIDESIDE72** · 04-26-2013, 12:06 AM

I bought an ofdset air cleaner off the parts board a few years back for $50. Post a WTB ad there.
Posted via Mobile Device

**70cst** · 04-26-2013, 12:23 AM

Hey 71shortygray ...

I luv your ride

71shortygray · 04-26-2013, 11:46 AM

thanks brother

04-25-2013, 03:27 PM	#1
71shortygray Registered User Join Date: Aug 2012 Location: Birmingham, AL Posts: 25	Air filter/cleaner question I have a 71 P10 with an 250 inline 6. It originally came with an offset air cleaner that had a riser/connector tube that went from the carb to air filter house. A hose would run from the side of that connector and into the side of the valve cover (see pic of an example). Mine is missing the offset air cleaner and connector but still has the hose coming out of the valve cover. So my question is would there be any issues with just taking that hose off and plugging the hole in the valve cover and then putting smaller air cleaner? Found one for that is 6" x 2.5" that will fit the space and carb. Thanks! Attached Images

04-25-2013, 04:10 PM	#2
SS Tim Registered User Join Date: Aug 2010 Location: Edwards, CA Posts: 7,503	Re: Air filter/cleaner question The hose is the crankcase breather and it uses the carb. inlet to evacuate the crankcase. While you could just use a breather you loose the positive vacuum effect. Also the TAC function is lost for warming inlet air by not using the air cleaner assy. The type of circular air filter that would fit in the space is really too small for the engine. Might want to look at fabricating an elbow similar to the factory rise and cross over the engine to the cold side. Then use a cone shape hose mount filter so popular on cold air inlet kits. In fact a universal kit might be a good start. __________________ Thanks, Tim * VIN/Model Decoders * Power Team Charts (engine/transmission/gear ratio) * Post Your Pickup SPID Blazer SPID Suburban/Panel SPID * RTFM ... Read The Factory Manuals... download 'em here Highlanders Do you have a 1972 Plaid Pickup? Plaid Blazer ** Plaid Suburban

04-25-2013, 04:23 PM	#3
71shortygray Registered User Join Date: Aug 2012 Location: Birmingham, AL Posts: 25	Re: Air filter/cleaner question Thanks -- good advice

04-25-2013, 05:53 PM	#4
Rufton Registered User Join Date: Apr 2013 Location: Knoxville TN Posts: 1,170	Re: Air filter/cleaner question My Dad ran a smaller filter that that on a 305 V6 for years and it didn't seem affect the mpg or power. It does need changing more often though. Some filters like Wix provides CFM rating on box. Is there any 3/8" or larger ports on intake to run a PCV?

04-25-2013, 10:00 PM	#5
71shortygray Registered User Join Date: Aug 2012 Location: Birmingham, AL Posts: 25	Re: Air filter/cleaner question not sure -- i may have a line on an offset air cleaner -- will aim get one of those on it. thanks

04-26-2013, 12:06 AM	#7
WIDESIDE72 Senior Member Join Date: Aug 2008 Location: Cedar Park, Texas Posts: 7,500	Re: Air filter/cleaner question I bought an ofdset air cleaner off the parts board a few years back for $50. Post a WTB ad there. Posted via Mobile Device

04-26-2013, 12:23 AM	#8
70cst Senior Member Join Date: Feb 2001 Location: New Madison, Ohio Posts: 21,373	Re: Air filter/cleaner question Hey 71shortygray ... I luv your ride __________________ A husband can be right...or...A husband can be happy. 67-72 Chevy and GMC Trucks...The Classic Truck for the Classic Folk. 1970 CST Two tone green, 402BB, 400 Automatic, Tach, Buckets, AC, AM-FM, Tilt, GM CB, GM 8 Tract, LWB, etc JOHN 17:3...The better side of "LIFE" Remember: Everyday is a good day...Some are just gooder!

04-26-2013, 11:46 AM	#9
71shortygray Registered User Join Date: Aug 2012 Location: Birmingham, AL Posts: 25	Re: Air filter/cleaner question thanks brother

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