I found this on the Pontiac Forum and thought some here might like to see it. Some of the fakes area pretty obvious but it still might help some of us from getting taken.
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Re: Real or fake Q-Jets??
One statement I would take issue with is regarding the casting, they were die cast, not sand cast, and die cast parts can have a relatively smooth finish. Some folks try to know more than they know.Bill Clupper #618 -
Re: Real or fake Q-Jets??
One statement I would take issue with is regarding the casting, they were die cast, not sand cast, and die cast parts can have a relatively smooth finish. Some folks try to know more than they know.Bill Clupper #618Comment
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Re: Real or fake Q-Jets??
Regardless, it's great info. to know. Thanks for posting it.Comment
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Re: Real or fake Q-Jets??
Regardless, it's great info. to know. Thanks for posting it.Comment
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Re: Real or fake Q-Jets??
Jim-----
This sort of "re-stamping" has been going on for quite awhile for not only carburetors, but other components as well. I've seen much better jobs than the ones pictured for carbs, though. A machined surface on the carb for the stamped number is a dead giveaway for a re-stamp. I've seen some much better re-stamps in which someone was able to remove the original numbers and re-stamp without machining the surface. I don't know how they did it, though. But, I know they did it.
Then, there's the situation with a SERVICE float bowl assembly. With these, one has a fresh, clean, unstamped surface to begin with. So, assuming that one has the correct stamping dies, one can create a virtually fool-proof "clone" of any carburetor part number.In Appreciation of John HinckleyComment
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Re: Real or fake Q-Jets??
Jim-----
This sort of "re-stamping" has been going on for quite awhile for not only carburetors, but other components as well. I've seen much better jobs than the ones pictured for carbs, though. A machined surface on the carb for the stamped number is a dead giveaway for a re-stamp. I've seen some much better re-stamps in which someone was able to remove the original numbers and re-stamp without machining the surface. I don't know how they did it, though. But, I know they did it.
Then, there's the situation with a SERVICE float bowl assembly. With these, one has a fresh, clean, unstamped surface to begin with. So, assuming that one has the correct stamping dies, one can create a virtually fool-proof "clone" of any carburetor part number.In Appreciation of John HinckleyComment
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Re: Real or fake Q-Jets??
Bill------
Yes, there haven't been too many sand cast carburetor components in modern times. I can think of no zinc or aluminum sand castings used in carburetors. In fact, as far as zinc is concerned (which is what the Q-Jet float bowl in question is manufactured from), I don't think that material was ever sand-cast. Carburetor components are almost always die or permanent mold castings.
I believe that some throttle body assemblies for Rochester 4GC were cast iron sand-castings, though.In Appreciation of John HinckleyComment
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Re: Real or fake Q-Jets??
Bill------
Yes, there haven't been too many sand cast carburetor components in modern times. I can think of no zinc or aluminum sand castings used in carburetors. In fact, as far as zinc is concerned (which is what the Q-Jet float bowl in question is manufactured from), I don't think that material was ever sand-cast. Carburetor components are almost always die or permanent mold castings.
I believe that some throttle body assemblies for Rochester 4GC were cast iron sand-castings, though.In Appreciation of John HinckleyComment
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Re: Real or fake Q-Jets??
Joe
You want to know how they do it? I thought of all kinds of ways, the one I found that works and is undetectable is just good old elbow grease and some sandpaper and a few minutes you can wipe the numbers off. When I found out that people were re stamping I started my own investigation to find out and educate me on the process so that I could learn the dark secrets of carburetor re stamping on Q-jets. Took a bunch of cores and went to school on them. Turns out the simplest way is the best way. And I had thought of all kinds of ways from milling to rolling the numbers out. But they are so easy they just almost wipe off. Then put them in the cabinet give them a quick bead blast and presto, your new numbered carburetor. Then send it out to get dichromate and your good to go. The real scary part is that some people you send to have your real numbered carburetor out to restored might not be that honest and send you back a carburetor that they re stamped! It has happened to some people.
KellyComment
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Re: Real or fake Q-Jets??
Joe
You want to know how they do it? I thought of all kinds of ways, the one I found that works and is undetectable is just good old elbow grease and some sandpaper and a few minutes you can wipe the numbers off. When I found out that people were re stamping I started my own investigation to find out and educate me on the process so that I could learn the dark secrets of carburetor re stamping on Q-jets. Took a bunch of cores and went to school on them. Turns out the simplest way is the best way. And I had thought of all kinds of ways from milling to rolling the numbers out. But they are so easy they just almost wipe off. Then put them in the cabinet give them a quick bead blast and presto, your new numbered carburetor. Then send it out to get dichromate and your good to go. The real scary part is that some people you send to have your real numbered carburetor out to restored might not be that honest and send you back a carburetor that they re stamped! It has happened to some people.
KellyComment
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Re: Real or fake Q-Jets??
Kelly------
Believe me, if they did it the way you described, then I would know how they did it. I wouldn't be wondering, at all.In Appreciation of John HinckleyComment
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Re: Real or fake Q-Jets??
Kelly------
Believe me, if they did it the way you described, then I would know how they did it. I wouldn't be wondering, at all.In Appreciation of John HinckleyComment
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Re: Real or fake Q-Jets??
Joe
you really don't get it. If you mill the carb body you will have a ridge that you can feel. When you wipe one with fine sand paper you will more or less just erase the numbers they are stamped so light into the carb body and not leave a ridge. then to knock down the slick shine after you stamp the numbers just lightly bead blast the numbers and the pad and YOU would not tell it. The other ways leave to many tell tell signs. I am telling you this is how they do it with the cores. would you like me to email a photo of one?
KellyComment
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Re: Real or fake Q-Jets??
Joe
you really don't get it. If you mill the carb body you will have a ridge that you can feel. When you wipe one with fine sand paper you will more or less just erase the numbers they are stamped so light into the carb body and not leave a ridge. then to knock down the slick shine after you stamp the numbers just lightly bead blast the numbers and the pad and YOU would not tell it. The other ways leave to many tell tell signs. I am telling you this is how they do it with the cores. would you like me to email a photo of one?
KellyComment
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