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By Tough55 - 17 Years Ago
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I done a search on PVC setups and didn't find exactly what I was looking for to do with my '312 Merc. I have a Holley #4160, 600cfm-Four Barrel Carb. It has a Full Manifold Vacuum Port for Power Brake or PCV. I currently have it plugged off. Can I drill a hole in the Right Valve Cover (next to the port on carb), insert a PVC Grommet, Valve and Rubber Hose to the Vacuum Port? Than go around on the drivers side and discard the original Road Draft Tube setup with a block off plate. Will this setup work right? Does it matter where I cut the hole for the PVC Valve in the Valve Cover? I appreciate any and all comments on this setup!!!!! Thanks~~~~~Ron
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By 55Birdman - 17 Years Ago
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Yes you can. Thats the way mine is on my 55 bird. I have had it for several years and it seems to do well.
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By Tough55 - 17 Years Ago
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Hey Birdman: Does it matter where the hole is drilled (rocker location underneath etc)? What's the part number or car that used the PVC Valve you are using? Thanks~~~~~Ron 
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By charliemccraney - 17 Years Ago
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If you put the hole in the center of the valve cover it will be between the middle 2 pairs of rocker arms. This should avoid any clearance issues with the rocker arms and position the valve so that oil is not being flung directly at it, off of the rocker arms. You could also position it between the front or rear pairs of rockers, wherever it is easiest for you.
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By Tough55 - 17 Years Ago
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I got to thinking after I posted my question.............The only reason I'm considering this is because I get alittle bit of smoke out the oil fill tube after I shut the engine down. I know I must have some ring problems with blowby. Even if I put in a PCV and block off the factory downdraft, I'm still going to have the problem I'm trying to eliminate..........Am I Right???? There's nothing wrong with the original downdraft setup (oil drip and etc.) It works perfect!!! Thanks~~~Ron
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By charliemccraney - 17 Years Ago
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I think a little bit of smoke is expected, even on a good engine, because it is an open system.
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By PF Arcand - 17 Years Ago
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Tough: First, is your drain back tube in the back of the canister clear? If not oil will drip out. Take the cover off & with a soft wire try to clear it.( an air gun might work also but could be messy) Failing that the canister base will have to be removed to clean it. In any case, for the crankcase to vent properly (PVC or not) the air intake which on a stock engine is the screened Oil Filler Cap, must be clear. It's very common for the screen to be plugged with oil residue & dirt, coming in thru the radiator, resulting in no proper crank case ventilation.
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By Tough55 - 17 Years Ago
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As I stated in an earlier post....The original system works perfect!!!! No oil drips etc. I guess the bottom line is if it ain't broke....don't fix it!!!! I'll just have to leave the hood down for about 5 minutes after I arrive at a cruise or show and let the smoke disappear. That's what I do now!!!! An earlier post by a member stated.....it is an open system and a little smoke is to be expected after shutdown. Sounds logical!!!!! Thanks to all for your input~~~~~~~~~~~~~~~~Ron
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By HoLun - 17 Years Ago
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I installed some gapless rings when I rebuild my engine and not only it did not smoke thru the filler, I can acutally feel noticable vacuum thru the filler at idle.
if you are going to use the valve covers for pcv vent, make sure you make a baffle for the pipe or valve, so that you wont pull excessive oil thru the pcv system.
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By yehaabill - 17 Years Ago
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Y-Guy My 2 cts: the pvc system should keep a lot of moisture out of the system.(and that white crud out of the oil cap) Secondly, I went to parts store and got a grommet to fit the hole in the valley pan where the draft tube came off, drilled out the threaded part in the valley pan to give the pcv valve clearance, hooked up a hose to the pvc port on the carb, it works great and a lot less "fumes" in the cab when idling around.. Hope this helps, Bill
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By miker - 17 Years Ago
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Moroso sells a grommet that has baffle, which will work well in the valley cover on a relatively stock motor. The PVC valve plugs right into it. You can also find oil filler caps which are sealed, with a tube out the side to run to the air cleaner side. It gives you a closed system with little more work.
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