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Old 10-23-2020, 02:29 PM
GoMopar440 GoMopar440 is offline
230 Tornado
 
Join Date: Jun 01, 2020
Location: Montana
Posts: 12
360 PCV mods?

I have a mostly stock 360 in my 75 J10, but will soon be swapping in a Performer intake and 4150 style 4bbl carb. So far my Google-fu has been too weak to find a how-to on how to keep the PCV system functioning properly with an aftermarket intake, carb and air cleaner. I don't mind modifying the valve covers and other parts, I just need to know the best way to go about it.
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'75 J10 Thriftside, 360, TH400, BW1339 (recent acquisition/work in progress to turn it into my DD)

'75 W300 Power Wagon C&C flat bed, 440, NP435, full time NP203, DRW, D60'S F&R W/4.88 ratio (getting MS3/3X for full seq. fuel and spark)
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Old 10-23-2020, 04:32 PM
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SC/397 SC/397 is offline
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Just like the normal stock one. Put a baffle under the pcv valve on the intake manifold and use a steel valley pan gasket.
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Old 10-23-2020, 04:50 PM
GoMopar440 GoMopar440 is offline
230 Tornado
 
Join Date: Jun 01, 2020
Location: Montana
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I'm mostly referring to doing something like this.

https://www.google.com/search?sxsrf=...6OtQqe_P1DmCtM
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'75 J10 Thriftside, 360, TH400, BW1339 (recent acquisition/work in progress to turn it into my DD)

'75 W300 Power Wagon C&C flat bed, 440, NP435, full time NP203, DRW, D60'S F&R W/4.88 ratio (getting MS3/3X for full seq. fuel and spark)
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Old 10-24-2020, 10:44 AM
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DarkMonohue DarkMonohue is offline
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Location: PNW
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If the new carb has a PCV fitting on the back, I'd use the stock setup. Valve with grommet in the manifold and a hose to the carb. Nice and simple.
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'85 J20 Old Man Truck, bought @ 65K miles - not great, but better than walking.
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High quality junk here: intro thread and slow build thread

Did you know? Willys is just Willis spelled differently, but pronounced the same. Neither Willy nor his apostrophe are involved.
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Old 10-24-2020, 08:26 PM
GoMopar440 GoMopar440 is offline
230 Tornado
 
Join Date: Jun 01, 2020
Location: Montana
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The aftermarket air cleaner has nowhere for the oil fill breather cap hose to go to. Given how much oil was all over the engine when I got the truck, I was hoping to make some improvements to the existing PCV system to keep more of the oil IN the engine.

Edit: I've got an idea how to go about it using a catch can (3 port in, 1 port out). I was thinking of routing the existing PVC hose to the can, plugging the oil fill tube like in the video and then adding two extra PCV holes, one on each valve cover that also go to the can. Plugging the intake oil tube hole means I'd also have to add an oil fill hole, cap and grommet to one of the valve covers. To keep the PCV air flowing in the correct direction, the can outlet port would be routed to the carb port that the original PCV went to.

Does this sound like it might work?
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'75 J10 Thriftside, 360, TH400, BW1339 (recent acquisition/work in progress to turn it into my DD)

'75 W300 Power Wagon C&C flat bed, 440, NP435, full time NP203, DRW, D60'S F&R W/4.88 ratio (getting MS3/3X for full seq. fuel and spark)

Last edited by GoMopar440 : 10-24-2020 at 08:40 PM.
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Old 10-24-2020, 08:34 PM
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DarkMonohue DarkMonohue is offline
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Gotcha. Not sure what to suggest there. My system is all stock and works really well after replacing the original hose with one that wasn't kinked shut. The original formed hose is NLA, and the run was too short to bend bulk hose smoothly, so I used a big loop of hose instead. Having a working PCV system immediately cured my leaking rear main seal.

As for the inlet side, maybe you could drill or punch a hole in the bottom piece of your air cleaner to accept a hose fitting. Just a thought.
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'85 J20 Old Man Truck, bought @ 65K miles - not great, but better than walking.
Member, FSJ Prissy Restoration Association
High quality junk here: intro thread and slow build thread

Did you know? Willys is just Willis spelled differently, but pronounced the same. Neither Willy nor his apostrophe are involved.

Last edited by DarkMonohue : 10-25-2020 at 12:26 PM. Reason: typo
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  #7  
Old 10-25-2020, 07:59 AM
wiley-moeracing wiley-moeracing is offline
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If your having this much of an issue with blow by, it may be time for a rebuild instead of a patch job?
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  #8  
Old 10-25-2020, 11:47 AM
GoMopar440 GoMopar440 is offline
230 Tornado
 
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Location: Montana
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Possibly, but as of yet I haven't gotten it running for more than a few seconds at a time. Once I have it starting and running without needing assistance from ether or pouring gas directly into the carb I'll have a better idea of what it needs.

I bought it in non-running condition with the infamous "ran when parked" story. The price was right ($500) to take a chance on it as I've always liked the J truck body style. I'm not too worried about relatively small issues like the PCV system. Those issues can be sorted by asking the right questions, educating myself about it and applying a sound solution. I realize that the factory engineers already applied the time and effort to design a perfectly functional system. That is for the stock engine though. Once I start making changes to the engine components, it's then on me to make those parts coexist with the stock parts.
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'75 J10 Thriftside, 360, TH400, BW1339 (recent acquisition/work in progress to turn it into my DD)

'75 W300 Power Wagon C&C flat bed, 440, NP435, full time NP203, DRW, D60'S F&R W/4.88 ratio (getting MS3/3X for full seq. fuel and spark)
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  #9  
Old 10-25-2020, 02:46 PM
johnsonic johnsonic is offline
258 I6
 
Join Date: Mar 12, 2015
Location: Oregon
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PCV from the performer intake to the back of the carb - there's a hole for it. I'm using this valve:

https://www.amazon.com/Standard-Moto.../dp/B000C8042Y

And and pretty sure this grommet:
https://www.google.com/search?q=NOE+...o me&ie=UTF-8

For the fill tube, just get a breather cap, like this:
https://www.edelbrock.com/chrome-sig...ther-4405.html
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1984 GW
360
Comp 260H
Magnum Roller Rockers
Wiseco -21cc Forged Pistons
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Holley SA 670
MSD 8523
Dakota Digital custom cluster
Serehill headlamp harness
NWMP aux tank

1987 GW deceased
...but the parts live on
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  #10  
Old 11-02-2020, 12:56 AM
Bob Barry Bob Barry is offline
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Quote:
Originally Posted by johnsonic
PCV from the performer intake to the back of the carb - there's a hole for it. I'm using this valve:

https://www.amazon.com/Standard-Moto.../dp/B000C8042Y

And and pretty sure this grommet:
https://www.google.com/search?q=NOE+...o me&ie=UTF-8

For the fill tube, just get a breather cap, like this:
https://www.edelbrock.com/chrome-sig...ther-4405.html
^^^
This

No need to go re-engineering the entire system. The factory system draws in filtered air through the oil-fill cap, and draws it out through that PCV valve sitting in the grommet in the intake behind the carburetor. The filtering for that fill-cap takes place in the cap; for oil-control, you can draw from anywhere (even just an open port), but there is no need for a fancy catch-can.
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