Finally got the exhaust off and disassembled...after soaking in rust penetraint for a month!.. Anyhow...in assessing what I have, I believe the secondary pipes to be original (due to thier squared off shape) but obviously hacked for the addition of aftermarket mufflers. My question is this...are the primary exhaust pipes original (manifold to trans crossmember)? Their shape is round with no relief ridges at the bends. I have included a photo.
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another pic
Here is a part number on the end of one of the primary exhaust pipes. Too short for GM number....right? Looks like N384986 or N384980 to me.
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Re: another pic
Jim------
The front pipes are original based on several things:
1) They look to be original front pipes; original front pipes were not "flattened" in any way;
2) Front pipes rarely have to be replaced unles they are damaged by striking something;
3) The part number shown is most of the part number for the 1965 2-1/2" front pipes. These pipes were GM #3849861, left, and 3849862, right. It looks like the "1" or the "2" have been "chopped off".
The rear pipes look to be original, too, from what I can see of them.
By the way, the rear pipes are ALWAYS shortened when SERVICE mufflers are installed, whether the SERVICE mufflers are GM or aftermarket. SERVICE mufflers have an extension on the forward (inlet) end. The extension is designed to mate with a SHORTENED rear pipe. There would be no PRACTICAL way to install a SERVICE muffler if the rear pipe was not shortened. Also, GM SERVICE rear pipes were "pre-shortened" to work with SERVICE mufflers.In Appreciation of John HinckleyComment
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thks Joe...
Any tips on preserving these things short of moving to AZ like.....paint....prelube6...?Comment
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Re: thks Joe...
Along time ago on my 65 pipes, I had them lightly sandblasted with a fine sand, then applied OSPHO which is a rust converter for down in the pits, then applied VHT brand high temp clear. They stayed rust free for years.Comment
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Preserving orig. underbody exhaust
Thanks Robb. What is OSPHO? The rustconverter I have used in the past seems to color the part black. What that the case with OSPHO? Suppose I am concerned with both preservation and a somewhat original looking appearance as well.Comment
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Re: Preserving orig. underbody exhaust
OSPHO is a phosphoric acid that converts iron oxide (rust) to phosphoric oxide if I remember right. It is black and hard so part doesn't continue to rust. I used it to prevent any rust left in the bottom of pits from causing larger rusting. OSPHO is green in color and very thin. A little bit goes a long ways. You want to put it on very thinly. Used it also on my exhaust manifolds and VHT high temp clear and they remained like new for years.Comment
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Re: Preserving orig. underbody exhaust
Used the POR-15 metal prep in the past which, I believe, is also phosphoric acid. I suspect there are multiple brands all providing phosphoric acid as a metal etch/rust converter. So...did the OSPHO turn your manifold and exhaust black? This would'nt look very original.Comment
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Re: Preserving orig. underbody exhaust
The exhaust pipes didn't turn black but stayed natural color as there wasn't any rust on then other than what might be at the bottom of a very small pit. so it wouldn't show up. Done jsut as a preventative measure. On the manifold they turned a natural looking color that really looked like they were when new. Again wasn't really any rust as the snadblast had removed it from surface. Judges liked them.Comment
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thnks Rob! n/m *NM*
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Sorry....meant thanks KEN!!!! N/M *NM*
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