So am I correct in understanding this Cliff ----- get an OEM 4 hole gasket and trace out and cut an oversize metal "gasket ". Put the OEM gasket on the intake, then the metal gasket on top, then a gasket like pictured above ?
Yes, to effectively seal off the heat channel in the intake you need a stock gasket down first, thicker metal plate and longer to the front to cover the "U" channel in the later model Q-jet. At that point you can use nearly any gasket you want under the carb that was made for the 1971 and later Q-jets that had the "U" channel in the baseplate. A LOT of folks miss that deal and don't get things effectively sealed up using those later carburetors on early intakes......
I have roughly cut out this piece of cardboard for the metal piece to make sure I'm on the right path Cliff. Just to make sure ----- I make it with 4 holes or the open chamber option ? Then I can use the open chamber top gasket as shown ? Or is it the best advantage to use a 4 hole top gasket I know that I ask a lot of questions, but with the effort I want to make sure I get it correct , the first time. Thankyou.
Go back to the previous page and look at the stock intake for the Q-jet. It's "notched" between the secondaries. Your metal plate should be open like the factory gasket. Once effectively sealed off you can run whatever gasket you want on top of it. I'd use the thick open gasket as shown in your pic....
Like one of these three paper samples ? ( I still need to add the extension bit on ) Unfortunately I don't have an OEM gasket for the manifold. Feeling my way in the dark a bit here with a generic one. I've made plenty of gaskets before so this is not a problem as long as I get it down right.
You can use whatever you want above the metal plate provided you made it long enough in the front to seal off the "U" channel in the carburetor. I prefer to leave the divider intact on dual plane intakes and use one 1/4" thick open gasket on top of them.....
Here you go Cliff, what do you think ? Any improvements required. I made a paper base gasket then a brass metal gasket, open chamber thick gasket on order.
Thankyou. I'm happy with it , looking forward to see how it runs with the newer carb. And you were exactly right about sealing. The earlier 17057213 carb we talked about I had on there, was running rough at idle. I found out why , because it wasn't sealed. As we would say here down under ---- "you're a legend mate " So what do you think of this air cleaner for my set up ? OK for this carb / engine combo or too small ?
Cool! With a Quadrajet it is a MUST to make sure the air cleaner lid is at least 3" from the top of the airhorn to air cleaner gasket surface. I see so many folks buying aftermarket "high rise" intakes, and or using 1" spacers then having to use a drop-base air cleaner to get it all under the hood. Some move the air cleaner lid WAY too close to the carburetor....... Don't ever dyno one of those set-ups unless you want to get your feeling hurt!......
I've just received the "gasket" in the post. The seller's advertised picture clearly shows a 1/4" gasket with the nylon pieces in the four corners that are supposed to prevent over tightening. What I got is a hard gasket much like an insulating pad with no nylon pieces in the corners. And it's coated in a clear lacquer ? Don't know if that's supposed to be become some sort of sealant when heated. Should I be using it ?
I've been selling parts for these carburetors over 20 years and have never seen a gasket like that. Several "skinned" versions of that gasket are out there, but not a "coated" version that I've seen and all of the 1/4" thick varieties I sell have the thick nylon washers imbedded in all four corners. Where did that one come from?......
I bought it from an Ebay parts seller. A lot of their parts are knock-off most likely from China. I asked the question regarding the lack of nylon inserts as pictured in ad and his reply is " Yes that's how they come now , but made in a hard material. These are supplied by the Quadrajet maker so I presume they're good " Which I believe is highly unlikely. I hate that sort of BS ! So do I give it a go or throw straight in the bin ?
Ebay is a yard sale for junk for the most part. Folks end up there looking for the absolute cheapest price with "free shipping". I sell very few parts on Ebay, can't afford their sales fees right to start with, but I'm not a "home based" business and rely on parts sales to keep the doors open and provide "free technical" assistance to folks needing help with these things. Selling cheap parts isn't part of the equation for a real business because you put yourself on the endangered species list. For sure you'll get some sales, but you'll be extinct in a few years if not a few months. The Government is cracking down on all that Ebay yard sale chit and going to make sure they get their cut of that deal. This will knock most of the folks right off the pile anyhow......rant over......
