68 bb exhaust part numbers and questions??

[Terry F.]

Re: Here's the exhaust system table for 1968

Any other details about the pipes would be helpful. As I recall, either one or both of my pipes looked like two pieces were welded together to make one pipe, possibly the bend was too sharp. I believe it was near the front of the pipe. If someone happens to have a picture of them, that would be great. Thanks for all the interest and help! Terry

[Terry F.]

Re: Here's the exhaust system table for 1968

Would these be the same part numbers as used in the factory? I found a 3869583 which is one digit off from the 584. Terry

[Joe L.]

Re: Here's the exhaust system table for 1968

Terry--

The only commonality between 1968 and 1969 exhaust systems was the tips. Actually, even these were different but they are functionally equivalent. ALL 1968's used 2-1/2" systems; ALL 1969's used 2" systems.

There are no welds that I know of on a 1968 big block exhaust system except the weld at the muffler.

[Terry F.]

Re: Here's the exhaust system table for 1968

I have seen pipes that were welded near the front as they come down from the exhaust manifold. If you look at the drawings in the assembly manual, they actually attempted to draw this feature (I think that is what they were up to). Joe, is there a chance you can tell me the application of these two oil pumps GM 475906 and 3964260. They have identical housings, only the pick-ups are different. I believe 260 may be correct for my 427/390. Thanks, Terry

[Joe L.]

Re: Here's the exhaust system table for 1968

Terry-----

When I get home I'll be able to look them up.

As far as the exhaust pipes go, I cannot imagine why there would be a welded section at the point that you describe for a big block for 1968 and I certainly don't recall any such welded section. I have an NOS set of 2-1/2" 68 big block pipes at home [not for sale], so I can check them when I get home.

[Terry F.]

Re: Here's the exhaust system table for 1968

I would appreciate it if you looked at your pipes. I always get a kick when I read your posts and you say "not for sale." Don't take this wrongly but I laugh to myself because every time I see that written I say to myself, "Ever thing has a price, we just haven't found out what it is yet..." Take care, Terry

[Joe L.]

Re: Here's the exhaust system table for 1968

Terry-----

The GM #475906 is the correct SERVICE replacement pump for your application. It replaced the original pump, GM #3904827. I don't think that the original pump was supplied in SERVICE with an attached pick-up tube. The "475" series replacement pumps have the tubes.

The GM #3964260 is a truck pump and has an attached pick-up for the truck pan. Otherwise, the pumps are the same.

I can't get at the 68 pipes without moving a lot of stuff I don't feel like moving. However, I still can't understand why there would be any welded section on the forward pipes. There might be, but I can't understand why there would be.

As far as "[not for sale]" is concerned, all I can say is that I have had quite a few offers for certain parts that I have. In some cases, the offers were FAR more than the parts are worth (i.e. they could be found and purchased elsewhere for less). I've never accepted an offer yet; not a single one.

[Terry F.]

Re: Here's the exhaust system table for 1968

I believe you when you say you haven't sold a single part. It might not be money that will pry it out of your hands though??? I am only joking with you. I looked at some take off pipes and they both had a section welded onto them near the front end. It looked like they were unable to bend the heavy pipe at 90 degrees coming off the exhaust manifold. Originally, when I got my car, I tossed my front pipes. At the time, I think I believed they were not original because they had a section welded onto them. They had all the bends and stuff also but I assumed they weren't original. So, that is where this all started. Now, I am wondering about this observation. So, I will make a few call. I am on the trail of some nos pipes I have both oil pumps, as you say, they are physically the same except for the pick-up section. As usual, your input and information is enormously appreciated. Trying to find a reliable place to rebuild my harmonic dampener. I think I am close. Thanks, Terry

[Terry F.]

Re: Here's the exhaust system table for 1968

I meant to say, "weren't able to bend it 90 degrees." Terry