Deadpurpledog Posted September 1, 2023 Share Posted September 1, 2023 67 Riv missing passenger side breather. Looks to me like 7/8”. Couldn’t find so tried 1” and way too big. Believe they are originals. Please help with correct size and, if possible, where best to look, please? Thanks for your continuing assistance. . . . You may not know how much it means. Link to comment Share on other sites More sharing options...
EmTee Posted September 2, 2023 Share Posted September 2, 2023 Passenger side? My '67 doesn't have anything on the passenger side valve cover. Does the driver's side (or maybe your passenger side) look like this? CA emission cars would have a hose to the air cleaner housing installed in place of the forward plug. CARS lists both painted and chrome versions of the twist-on breather/oil cap. https://oldbuickparts.com/product/oil-cap-black/ https://oldbuickparts.com/product/oil-cap-chrome-plated/ Link to comment Share on other sites More sharing options...
Deadpurpledog Posted September 3, 2023 Author Share Posted September 3, 2023 Nothing like that. On vacation. Will take pictures in a week and perhaps you’ll recognize what I have. Who knows, perhaps not original. 1 Link to comment Share on other sites More sharing options...
LARRY70GS Posted September 3, 2023 Share Posted September 3, 2023 Probably 3/4". Maybe this, https://www.summitracing.com/parts/sum-g3418 Link to comment Share on other sites More sharing options...
Smartin Posted September 4, 2023 Share Posted September 4, 2023 Post a photo of the passenger side cover so we know what we are looking at. Link to comment Share on other sites More sharing options...
Deadpurpledog Posted September 4, 2023 Author Share Posted September 4, 2023 Thanks! Seemed to measure 7/8 & that doesn’t seem to exist. Need to have main seal replaced and I’m hoping they can figure it out. Until then, I have a 7/8 hole as a breather. Can you believe someone could sell a vehicle as a 1-2 with a hole in the engine?! Link to comment Share on other sites More sharing options...
EmTee Posted September 4, 2023 Share Posted September 4, 2023 2 hours ago, Deadpurpledog said: Can you believe someone could sell a vehicle as a 1-2 with a hole in the engine?! Well, at least it's at the top... 1 Link to comment Share on other sites More sharing options...
Deadpurpledog Posted September 13, 2023 Author Share Posted September 13, 2023 Here are pictures, EmTee. The hole does not have two “wing” slots for many breathers and does not appear to be threaded. What are you thoughts, please? Link to comment Share on other sites More sharing options...
EmTee Posted September 13, 2023 Share Posted September 13, 2023 Well, I personally have never seen covers like those before. The hole on the right cover looks like the one typically punched into that flat circle at the forward end of your left cover. On my '67, that hole has a rubber plug in it since it is a 49-state car. CA cars would have a hose attached there that connects to the air cleaner housing. The right cover on my '67 has no holes. Looking on the internet, I did find pictures of a GS with covers like yours. That car has the hole plugged, as I would expect for a 49-state car. The left cover, however, has a closed cap like yours (but chrome) which I believe is incorrect. If the PCV vent port is plugged, the oil filler needs a breather cap to provide fresh air intake for the PCV system. Maybe @JZRIV or others can comment, but if this were my car, I'd plug the hole in the passenger side cover and install a breather cap on the driver's side cover like the one I posted above from CARS. Hey, wait --- are the pictures I posted from the internet actually YOUR car??? Link to comment Share on other sites More sharing options...
EmTee Posted September 13, 2023 Share Posted September 13, 2023 Just found this photo of an A-Body GS-400: This has a closed cap, but there is a breather in the other hole. I don't know whether this is correct for a 400, but it looks like the driver's side cover on my 430. Point is, there needs to be a breather somewhere to allow for air into the crankcase... 1 Link to comment Share on other sites More sharing options...
Deadpurpledog Posted September 13, 2023 Author Share Posted September 13, 2023 Here are pictures, EmTee. The hole does not have two “wing” slots for many breathers and does not appear to be threaded. What are you thoughts, please? Link to comment Share on other sites More sharing options...
Deadpurpledog Posted September 13, 2023 Author Share Posted September 13, 2023 You’re so smart! Didn’t think about placing breather on driver side. How would you seal the hole on passenger side. . . Seems there is no way of attaching. Really don’t like having an open hole. Would you try to find a different cover, EmTee? Link to comment Share on other sites More sharing options...
dship Posted September 13, 2023 Share Posted September 13, 2023 Measure the diameter of the open hole and go to a box store, auto store, etc., to find a rubber cap/stopper the same size. 1 Link to comment Share on other sites More sharing options...
JohnD1956 Posted September 13, 2023 Share Posted September 13, 2023 15 hours ago, Deadpurpledog said: Here are pictures, EmTee. The hole does not have two “wing” slots for many breathers and does not appear to be threaded. What are you thoughts, please? Those look like 69 or later covers. On my 69 there is a tube that is preformed that goes from there to the aircleaner. 2 Link to comment Share on other sites More sharing options...
EmTee Posted September 13, 2023 Share Posted September 13, 2023 (edited) Thanks @JohnD1956 - I think you've solved the mystery! The covers on your 400 look just like the ones on @Deadpurpledog's 430. I think someone has installed a set of 400 valve covers on this Riviera. That said, there are a couple of options to solve the breather dilemma: 1) Get a rubber plug to fill the small hole and replace the solid oil fill cap with a twist-on breather cap or, 2) Leave the solid filler cap and find a push-in breather with grommet to put in the small hole (like the picture I posted above). From CARS: https://oldbuickparts.com/wp-content/uploads/2022/08/catriv.pdf Look here for a push-in breather to fit the hole in the valve cover: https://www.summitracing.com/search?SortBy=BestKeywordMatch&SortOrder=Ascending&keyword=push-on breather Edited September 13, 2023 by EmTee (see edit history) 1 Link to comment Share on other sites More sharing options...
Deadpurpledog Posted September 14, 2023 Author Share Posted September 14, 2023 Incredible! How do you find all these providers?! Believe one of these will be perfect and one of the breathers which didn’t fit may replace solid on driver’s side. Hope some time I will best able to return the generosity I’ve found on this site. Thank you. 1 Link to comment Share on other sites More sharing options...
EmTee Posted September 15, 2023 Share Posted September 15, 2023 For Buick stuff I usually check CARS and Bob's Automobilia. https://oldbuickparts.com/ https://bobsautomobilia.com/ If I still can't find what I'm looking for, There's Kanter and Fusick. https://www.kanter.com/ https://www.fusickautomotiveproducts.com/ Join AACA, BCA and or the GSCA. Then you'll get their magazine(s) with more specific parts and service vendors. Places like Summit and Jegs are good places to look for parts that are not specific to classic or antique cars (like the valve cover breather). When all else fails, post your question on this forum! Link to comment Share on other sites More sharing options...
Ben Bruce aka First Born Posted September 15, 2023 Share Posted September 15, 2023 11 hours ago, Deadpurpledog said: Incredible! How do you find all these providers?! Believe one of these will be perfect and one of the breathers which didn’t fit may replace solid on driver’s side. Hope some time I will best able to return the generosity I’ve found on this site. Thank you. Helpful websites, vendor and services, under Buick General in this Forum. Ben 1 Link to comment Share on other sites More sharing options...
Deadpurpledog Posted September 15, 2023 Author Share Posted September 15, 2023 Hmmmmm. . . who knew? I'm sure other "newbies" and I appreciate all the help shared by you and the other experienced members. Thank you, Ben. Link to comment Share on other sites More sharing options...
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