pcv reroute? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

70inbville · 01-01-2016, 12:46 PM

will the fit/work on a 04 6.0 iron block?

http://www.summitracing.com/parts/nal-12568002

my engine is not rebuilt yet and the intake has a lot of oil in it, not sure where it came from, I don't have the original heads. I am looking for an alterative to a catch can. it is not going to be a "drag" truck but a healthy/ fun DD.

Thanks,

Chip

homemade87 · 01-01-2016, 04:57 PM

Chip, That is exactly what you want . Most will call it a ls6 valley cover . Also you will need to put 2 small 2" round filters on the valve covers . What this does is pull air out from the valley where the oil is not suspended in the air like it is in the valve covers . The small filters is for air intake on the valve covers . Air in , air out .

The problem with the ls system is , it pulls air out the valve covers where the oil is being slung all around and suspended in the air . If you are pulling air from the valve cover you are also pulling oil along with it .

I have this on 2 engines with great success .

70inbville · 01-01-2016, 06:28 PM

Thanks for the response, that is what I was thinking. now I just need to find a dishwasher that I can wash the intake in ( the Wife says no to the one in the house)

solidaxel · 01-02-2016, 12:45 AM

Following this one

aknovaman · 01-02-2016, 09:02 AM

Take it to a car wash or the local transmission shop and have them throw it in their hot washing machine. My local guy does that for free and it cleans at about 195 degrees using hot water. Removes every bit of oil residue.

70inbville · 01-02-2016, 11:22 AM

Quote:

Originally Posted by aknovaman

Take it to a car wash or the local transmission shop and have them throw it in their hot washing machine. My local guy does that for free and it cleans at about 195 degrees using hot water. Removes every bit of oil residue.

I'll give one a call Monday and check that out great idea, Thanks

70inbville · 01-02-2016, 01:43 PM

Quote:

Originally Posted by homemade87

I have this on 2 engines with great success .

any pics of this setup?

homemade87 · 01-02-2016, 02:53 PM

Quote:

Originally Posted by 70inbville

any pics of this setup?

My 82 is apart right now doing a cam and head upgrade . It will be a month or so before I get it back together . The other is on a carbed ls2 in a 67 camaro . The concept is the same . Vacuum is pulled from the valley cover from the intake , and filters on the valve covers for clean air in . In my eyes this gives a good air flow from the heads on both sides , down thru into the crank case up into the valley , out the valley cover to the intake .

I will get a couple pictures .

homemade87 · 01-02-2016, 06:19 PM

Here you go 70 . On this carb engine the valley hose works it way to the back of the intake . As you can see the pass side filter on the valve cover . I mounted my filter to the head and run a hard line to it . You can add the filter any way you want . Its just what I did . The drivers side I run a hose to the filter from the valve cover . I fastened it with a strap to the back of the head . This has been working great for me .

On the FI intake you will attach the valley hose to the top of the intake about center where the pcv hose was originally . I will not have my 82 engine mods together for a while so I will not have pictures of it .

70inbville · 01-03-2016, 10:23 AM

I like it! thank homemade, looks great.

NotMyMojo · 01-03-2016, 11:18 PM

I just installed the LS6 valley cover on my L33 following this guide, and I'm using the original truck intake with EFI (unlike the carbed example above). I decided to go the route of the LS6 valley cover rather than use a catch can as I believe the LS6 valley cover will eliminate any oil from being sucked up into the intake. When I first removed my intake to change the gaskets, I was amazed at the amount of oil that had caked the inside of it, and that's what led me down the path to exploring a solution.

My engine is a truck engine, so its original PCV system is different than the LS1 that is used in the guide (and thankfully didn't require any part of the block to be notched with a dremel!). I plugged off the PCV port on the rear of the driver's side valve cover using a 5/16 vacuum cap, and then kept the fresh air intake line from the passenger side valve cover which plugs into the intake behind the throttle body (there did not appear to be any oil being sucked up in this hose). The original hose that runs from the PCV port on the driver's rear valve cover connects to the truck intake on the very top of the intake unlike on the LS6 intake where it is on the bottom passenger side directly behind the throttle body, so I will have to make a custom hose from the LS6 PCV valley cover port to the top of the truck intake.

Also, you want the valley cover part # 12577927 as this is the updated LS6 valley cover with a built-in PCV. If you use the one you linked to (the older style), you will have to run an external PCV valve. Even though part # 12577927 is the updated version with built in PCV, it is cheaper than the older version without the PCV (bonus!). I picked up the valley cover from GM Parts Direct, but you do have to pay shipping. Link to part # 12577927

homemade87 · 01-04-2016, 07:57 AM

Notmymojo , Good catch .The valley cover 12577927 is what you want if you have valley knock sensors . I did not catch the part # of the other .

Also my opinion on the set up in the link . If you hook a hose from a valve cover to any part of your intake system expect to still get some oil in the intake . The hose that hooks to the throttle body from the valve cover is supposed to be before the the throttle body for filtered air . It will still have a small amount of vacuum that will pull oil . Take it off and put a small filter on it . It does the same thing ( filtered air ) but gets rid of the chance of oil getting into the intake .

Another piece of info . The ls6 valley cover does not have a pcv valve . It is designed with a orifice hole instead .

LeesTruk · 01-05-2016, 09:16 AM

Here's an idea. Why not bore a hole in an original valley cover that would accept a PCV grommet and install a fixed orifice PCV valve (GM #12572717), then route a line from that to an existing PCV line? Might save you a few bucks. There seems to be ample room beneath a truck type plenum, but I'm not sure on a car type plenum. If you visit boneyards at all, look for GM intermediate cars that are equipped with 3.1/3.4L engines and snag the PCV line from them. It has a nice 90* elbow that attaches to the PCV nipple, and a good section of hard line that can be grafted onto

homemade87 · 01-05-2016, 09:50 AM

Leestruk,This is a good idea and be more effective that what oem does now . I have seen some add a pcv to the valley on carb engines ( dont know the results). There is no baffle to catch what little oil there is suspended but I am sure there is some , but it would still be better than pulling vacuum from a valve cover if it could be added .

I would suspect it would have to be strategically placed if it would fit .

ls6 valley cover still gets my vote .

Custom 68 · 01-05-2016, 10:05 AM

wow guys great information for the new year!

solidaxel · 01-05-2016, 10:10 AM

Does it make a difference if it comes from the front or the rear of the valley cover?

LeesTruk · 01-05-2016, 11:02 AM

I wouldn't think so, seeing as the valley is just a void subject to internal pressures, but I'm sure some engineer type could quantify this. Making a simple strainer/shield beneath the valve shouldn't be too hard, to ward off any splashing. Personally, I'd put the valve either side of center to avoid interference with knock sensor wiring. Back in the day, 231/3.8 V6 Buicks put their PCV's into the pass. side rear of the intake manifolds, and they weren't shielded from splash

BR3W CITY · 01-05-2016, 04:20 PM

The catch can is still popular for that reason. You'll never 100% prevent some oil in the intake, but you can limit it. If you go boosted, its the easiest solution to deal with the amount of oil blowby that occurs under the pressure.

slotard · 01-05-2016, 04:25 PM

Any suggestions for a basic catch can? I just put a PCV on my '73 C20 (before it just had breathers) and think it would be a good idea.

67chevy1series · 01-06-2016, 04:52 PM

I'm going to run a carburetor on my 5.3, what is the benefit of having the ls6 style valley cover with the breather in it? For a carbureted set up is the PCV on the rear driver valve cover and the breather on the front passenger valve cover not sufficient?

70inbville · 01-06-2016, 04:58 PM

found this in another build thread

http://67-72chevytrucks.com/vboard/s...=563712&page=5

looks like I am going to try this save where I can.(post 103)

01-01-2016, 04:57 PM	#2
homemade87 Registered User Join Date: Apr 2010 Location: Guntersville Alabama Posts: 1,073	Re: pcv reroute? Chip, That is exactly what you want . Most will call it a ls6 valley cover . Also you will need to put 2 small 2" round filters on the valve covers . What this does is pull air out from the valley where the oil is not suspended in the air like it is in the valve covers . The small filters is for air intake on the valve covers . Air in , air out . The problem with the ls system is , it pulls air out the valve covers where the oil is being slung all around and suspended in the air . If you are pulling air from the valve cover you are also pulling oil along with it . I have this on 2 engines with great success .

01-01-2016, 06:28 PM	#3
70inbville Registered User Join Date: Oct 2011 Location: bartlesville ok Posts: 143	Re: pcv reroute? Thanks for the response, that is what I was thinking. now I just need to find a dishwasher that I can wash the intake in ( the Wife says no to the one in the house)

01-02-2016, 12:45 AM	#4
solidaxel Registered User Join Date: Dec 2002 Location: Cactus Patch So. Az Posts: 4,749	Re: pcv reroute? Following this one __________________ 53 TuTone Extended Cab 350 4-Spd 3:08 (SOLD) 53 Chevy Moldy pearl green ZZ-4 4L60E 9" 3:25 55 GMC 1st Black Mll (ZZ4) ZZ6 TKO 600 5 sp 3:73 62 Solidaxle Corvette Roman Red (327 340hp 4spd 3:36) C4 & C5 suspension tube chassis LS 3 4L70E 65 Corvette Coupe 327 350hp 4spd 4:11 78 Black Silverado SWB (350/350) 5.3 & 4L60E 3:42 2000 S-Type 3.0 (wife cruiser) 2003 GMC SCSB 5.3 4L60E 3:42

01-02-2016, 09:02 AM	#5
aknovaman Registered User Join Date: Aug 2013 Location: Tecumseh Posts: 355	Re: pcv reroute? Take it to a car wash or the local transmission shop and have them throw it in their hot washing machine. My local guy does that for free and it cleans at about 195 degrees using hot water. Removes every bit of oil residue. __________________ Current project 1959 Willys = GEZR TRUK Geezer is a Latin compound word made up of two roots. Gee meaning Urine Stain and Zer meaning your pants are open! FMCDH GBU and GBA http://www.youtube.com/user/aknovaman/videos

01-02-2016, 06:19 PM	#9
homemade87 Registered User Join Date: Apr 2010 Location: Guntersville Alabama Posts: 1,073	Re: pcv reroute? Here you go 70 . On this carb engine the valley hose works it way to the back of the intake . As you can see the pass side filter on the valve cover . I mounted my filter to the head and run a hard line to it . You can add the filter any way you want . Its just what I did . The drivers side I run a hose to the filter from the valve cover . I fastened it with a strap to the back of the head . This has been working great for me . On the FI intake you will attach the valley hose to the top of the intake about center where the pcv hose was originally . I will not have my 82 engine mods together for a while so I will not have pictures of it . Attached Images

01-01-2016, 12:46 PM	#1
70inbville Registered User Join Date: Oct 2011 Location: bartlesville ok Posts: 143	pcv reroute? will the fit/work on a 04 6.0 iron block? http://www.summitracing.com/parts/nal-12568002 my engine is not rebuilt yet and the intake has a lot of oil in it, not sure where it came from, I don't have the original heads. I am looking for an alterative to a catch can. it is not going to be a "drag" truck but a healthy/ fun DD. Thanks, Chip

01-03-2016, 10:23 AM	#10
70inbville Registered User Join Date: Oct 2011 Location: bartlesville ok Posts: 143	Re: pcv reroute? I like it! thank homemade, looks great.

01-03-2016, 11:18 PM	#11
NotMyMojo Registered User Join Date: Aug 2014 Location: Gainesville, GA Posts: 51	Re: pcv reroute? I just installed the LS6 valley cover on my L33 following this guide, and I'm using the original truck intake with EFI (unlike the carbed example above). I decided to go the route of the LS6 valley cover rather than use a catch can as I believe the LS6 valley cover will eliminate any oil from being sucked up into the intake. When I first removed my intake to change the gaskets, I was amazed at the amount of oil that had caked the inside of it, and that's what led me down the path to exploring a solution. My engine is a truck engine, so its original PCV system is different than the LS1 that is used in the guide (and thankfully didn't require any part of the block to be notched with a dremel!). I plugged off the PCV port on the rear of the driver's side valve cover using a 5/16 vacuum cap, and then kept the fresh air intake line from the passenger side valve cover which plugs into the intake behind the throttle body (there did not appear to be any oil being sucked up in this hose). The original hose that runs from the PCV port on the driver's rear valve cover connects to the truck intake on the very top of the intake unlike on the LS6 intake where it is on the bottom passenger side directly behind the throttle body, so I will have to make a custom hose from the LS6 PCV valley cover port to the top of the truck intake. Also, you want the valley cover part # 12577927 as this is the updated LS6 valley cover with a built-in PCV. If you use the one you linked to (the older style), you will have to run an external PCV valve. Even though part # 12577927 is the updated version with built in PCV, it is cheaper than the older version without the PCV (bonus!). I picked up the valley cover from GM Parts Direct, but you do have to pay shipping. Link to part # 12577927

01-04-2016, 07:57 AM	#12
homemade87 Registered User Join Date: Apr 2010 Location: Guntersville Alabama Posts: 1,073	Re: pcv reroute? Notmymojo , Good catch .The valley cover 12577927 is what you want if you have valley knock sensors . I did not catch the part # of the other . Also my opinion on the set up in the link . If you hook a hose from a valve cover to any part of your intake system expect to still get some oil in the intake . The hose that hooks to the throttle body from the valve cover is supposed to be before the the throttle body for filtered air . It will still have a small amount of vacuum that will pull oil . Take it off and put a small filter on it . It does the same thing ( filtered air ) but gets rid of the chance of oil getting into the intake . Another piece of info . The ls6 valley cover does not have a pcv valve . It is designed with a orifice hole instead .

01-05-2016, 09:16 AM	#13
LeesTruk Registered User Join Date: Mar 2015 Location: Manchester, CT Posts: 433	Re: pcv reroute? Here's an idea. Why not bore a hole in an original valley cover that would accept a PCV grommet and install a fixed orifice PCV valve (GM #12572717), then route a line from that to an existing PCV line? Might save you a few bucks. There seems to be ample room beneath a truck type plenum, but I'm not sure on a car type plenum. If you visit boneyards at all, look for GM intermediate cars that are equipped with 3.1/3.4L engines and snag the PCV line from them. It has a nice 90* elbow that attaches to the PCV nipple, and a good section of hard line that can be grafted onto

01-05-2016, 09:50 AM	#14
homemade87 Registered User Join Date: Apr 2010 Location: Guntersville Alabama Posts: 1,073	Re: pcv reroute? Leestruk,This is a good idea and be more effective that what oem does now . I have seen some add a pcv to the valley on carb engines ( dont know the results). There is no baffle to catch what little oil there is suspended but I am sure there is some , but it would still be better than pulling vacuum from a valve cover if it could be added . I would suspect it would have to be strategically placed if it would fit . ls6 valley cover still gets my vote .

01-05-2016, 10:05 AM	#15
Custom 68 Registered User Join Date: Nov 2001 Location: Springfield, MO Posts: 2,939	Re: pcv reroute? wow guys great information for the new year! __________________ Dave 1968 Custom Chevy with turbo charged 5.3 gen III 4l80e swap 1967-71 GMC 3/4 ton long step 4x4 (not sure what year exactly?) "A good friend will bail you out of jail...but a true friend will be sitting next to you saying "that was frekin awesome". "If it doesn't fit force it...If it breaks then it needed to be replaced anyway!"

01-05-2016, 10:10 AM	#16
solidaxel Registered User Join Date: Dec 2002 Location: Cactus Patch So. Az Posts: 4,749	Re: pcv reroute? Does it make a difference if it comes from the front or the rear of the valley cover? __________________ 53 TuTone Extended Cab 350 4-Spd 3:08 (SOLD) 53 Chevy Moldy pearl green ZZ-4 4L60E 9" 3:25 55 GMC 1st Black Mll (ZZ4) ZZ6 TKO 600 5 sp 3:73 62 Solidaxle Corvette Roman Red (327 340hp 4spd 3:36) C4 & C5 suspension tube chassis LS 3 4L70E 65 Corvette Coupe 327 350hp 4spd 4:11 78 Black Silverado SWB (350/350) 5.3 & 4L60E 3:42 2000 S-Type 3.0 (wife cruiser) 2003 GMC SCSB 5.3 4L60E 3:42

01-05-2016, 11:02 AM	#17
LeesTruk Registered User Join Date: Mar 2015 Location: Manchester, CT Posts: 433	Re: pcv reroute? I wouldn't think so, seeing as the valley is just a void subject to internal pressures, but I'm sure some engineer type could quantify this. Making a simple strainer/shield beneath the valve shouldn't be too hard, to ward off any splashing. Personally, I'd put the valve either side of center to avoid interference with knock sensor wiring. Back in the day, 231/3.8 V6 Buicks put their PCV's into the pass. side rear of the intake manifolds, and they weren't shielded from splash

01-05-2016, 04:20 PM	#18
BR3W CITY meowMEOWmeowMEOW Join Date: Sep 2009 Location: MKE WI Posts: 7,128	Re: pcv reroute? The catch can is still popular for that reason. You'll never 100% prevent some oil in the intake, but you can limit it. If you go boosted, its the easiest solution to deal with the amount of oil blowby that occurs under the pressure. __________________ *'66 Short Step / SD Tuned / Big Cam LQ4 / Backhalfed /Built 4l80e / #REBUILDEVERYTHING* MY BUILD THE H8RDCPTR //\\ MY YOUTUBE CHANNEL REV J HD



Register or Log In To remove these advertisements.

01-05-2016, 04:25 PM	#19
slotard Registered User Join Date: Nov 2014 Location: Alameda, CA Posts: 877	Re: pcv reroute? Any suggestions for a basic catch can? I just put a PCV on my '73 C20 (before it just had breathers) and think it would be a good idea. __________________ 1973 C20, 350/350

01-06-2016, 04:52 PM	#20
67chevy1series Registered User Join Date: Mar 2010 Location: a t w a t e r cali 95301 Posts: 10,713	Re: pcv reroute? I'm going to run a carburetor on my 5.3, what is the benefit of having the ls6 style valley cover with the breather in it? For a carbureted set up is the PCV on the rear driver valve cover and the breather on the front passenger valve cover not sufficient?

01-06-2016, 04:58 PM	#21
70inbville Registered User Join Date: Oct 2011 Location: bartlesville ok Posts: 143	Re: pcv reroute? found this in another build thread http://67-72chevytrucks.com/vboard/s...=563712&page=5 looks like I am going to try this save where I can.(post 103)

Register or Log In To remove these advertisements.