When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
I have this crankcase vent thing setup on my 1971 360 and it's soaked with oil and making a mess so I'm trying to figure out how it should be plumbed. I've seen some diagrams that look like this vent in the valve cover originally went to the air filter housing which I no longer have of course. I've also seen a PCV system that fits into the oil filler cap which I also don't have, the oil filler cap is a solid stamped steel piece. I'm thinking that the lack of a PCV system is causing all blow-by gasses out of this filter and soaking it with oil so the solution might be to add a PCV system. Can I use this port for a PCV valve or should it remain as is and I need to install a PCV system somewhere else on the engine?
I have this crankcase vent thing setup on my 1971 360 and it's soaked with oil and making a mess so I'm trying to figure out how it should be plumbed. I've seen some diagrams that look like this vent in the valve cover originally went to the air filter housing which I no longer have of course. I've also seen a PCV system that fits into the oil filler cap which I also don't have, the oil filler cap is a solid stamped steel piece. I'm thinking that the lack of a PCV system is causing all blow-by gasses out of this filter and soaking it with oil so the solution might be to add a PCV system. Can I use this port for a PCV valve or should it remain as is and I need to install a PCV system somewhere else on the engine?
My '68 360 had some funky stuff going on also which I am currently fixing... The passenger side breather goes by hose to the back of the carb spacer on the intake and the driver's side goes to the air cleaner (oil bath on mine). Might be changes by '71 though...
Lahti35 is correct. See below pictures of my 71' FE360. Excuse the wiring mess...in the middle of reconfiguring and painting engine components. Have the valve covers to do next.
PCV Valve going to the back of the carburetor port. The Holley 4 barrel has the port versus using the carb spacer.
Notice the oil filler cap has the hose that goes to the factory air breather.
When I went to a HEI distributor, I removed the PCV valve and had to switch to a different air filter because the HEI is so tall. I am going to put original dist. and PCV back on one of these days and add petronix instead. I like the original look and cleaner valve covers. Ive seen people add an oil trap as well.
You need to duplicate the PCV plumbing of @Eric Hamilton’s engine. You will connect the hose from the chrome breather hose on the driver’s side to a fitting after punching a hole in the bottom of your chrome air filter housing.
I ordered a chrome vented cap for the drivers side opening so I wouldn't have to punch a hole in the breather. I also ordered a preformed PCV hose and will source the PCV valve locally. I'm hoping the grommet is not stretched too far out of shape as there were several different size options and I wasn't sure which one to order.
Yet another version...lol. I am seeing some consistency with the driver's side opening going to the air filter. I can't do that because I don't have the original air filter but I think the breather cap I've ordered will work there. The passenger side seems to vary a bit but most seem to be a PCV system of some sort either plugged directly into the valve cover or into a filter/breather thing like yours. My plan is to use a breather cap on the driver's side and a PCV system directly into the valve cover grommet on the passenger side and hope that's better that the mess I have now.
Thanks all for the pictures and comments, that really helped.
I think if you dont use the whole system as the diagram above, you might as well not put a PCV valve on it. The PCV wont draw the gasses out of the crank case without being connected to the air filter. The other side that is also connected is where the fresh air draws into the crank case as the gasses are pulled out. Here is a video of how it works. https://video.search.yahoo.com/yhs/s...1&action=click .
Last edited by 1browski; Aug 19, 2021 at 08:46 PM.
Reason: spell check
I think if you dont use the whole system as the diagram above, you might as well not put a PCV valve on it. The PCV wont draw the gasses out of the crank case without being connected to the air filter. The other side that is also connected is where the fresh air draws into the crank case as the gasses are pulled out. Her is a video of how it works. https://video.search.yahoo.com/yhs/s...1&action=click .
You do not need to connect to an air cleaner housing. The PCV side creates a vacuum in the crankcase. Air will be drawn in from the breather on the other side, regardless of the source. These were routed to the aircleaner to provide cleaner air, and a place for the little filter for the air going into the crancase, and to enclose the little bit of backflow crankcase fumes after shut down.
As llong as the breather has some kind of decent filter on it, clean air will be drawn into the crankcase. K&N sells breathers for a variety of engines in a number of sizes for example.
Yet another version...lol. I am seeing some consistency with the driver's side opening going to the air filter. I can't do that because I don't have the original air filter but I think the breather cap I've ordered will work there. The passenger side seems to vary a bit but most seem to be a PCV system of some sort either plugged directly into the valve cover or into a filter/breather thing like yours. My plan is to use a breather cap on the driver's side and a PCV system directly into the valve cover grommet on the passenger side and hope that's better that the mess I have now.
Thanks all for the pictures and comments, that really helped.
Yes a breather cap would still draw in the clean air. If the PCV isnt connected to the air filter then there is no vacuum to draw out of the crank case. The OP mentioned adding PCV valve into the valve cover grommet going to nowhere. Might as well just put a cap on it.
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.
