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Looking for stainless steel y pipe for small block Chevy. #5239614 10/14/19 05:44 PM
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joegreen Offline OP
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I was driving my 78 chevy k20 today and it got loud all of the sudden. The y pipe rotted out right where the pipe connects to the manifold. I need a new y pipe. Basically i can get a walker aluminized steel y pipe for $110 but i was looking for a stainless steel y pipe. I am surprised for as many sbc engines made i can't find any aftermarket stainless y pipes. So basically i am looking for either a stainless steel y pipe or a cheap aluminized steel y pipe. I can weld it all together myself and would prefer not to spend $110 on an aluminized steel y pipe. I would be more comfortable paying $50 for an aluminized steel y pipe if possible but would prefer some stainless options if anyone can point some out to me. Thanks

Last edited by joegreen; 10/14/19 05:45 PM.

1978 Chevrolet k20
Engine: Delo 10w30xle
Transmission: Castrol transmax dex/merc

1984 Mercedes-Benz 300 turbo diesel
Engine: Delo 400 15w40le
Re: Looking for stainless steel y pipe for small block Chevy. [Re: joegreen] #5239711 10/14/19 07:09 PM
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Kira Offline
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There's got to be stainless fabricators around. Ask at a speed shop if you're near any.

Re: Looking for stainless steel y pipe for small block Chevy. [Re: Kira] #5239768 10/14/19 08:22 PM
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joegreen Offline OP
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Originally Posted by Kira
There's got to be stainless fabricators around. Ask at a speed shop if you're near any.

I didnt want to spend a lot of money. I am just looking for something i can bolt up. The truck rarely gets driven and is mostly used to plow my driveway


1978 Chevrolet k20
Engine: Delo 10w30xle
Transmission: Castrol transmax dex/merc

1984 Mercedes-Benz 300 turbo diesel
Engine: Delo 400 15w40le
Re: Looking for stainless steel y pipe for small block Chevy. [Re: joegreen] #5239857 10/15/19 02:25 AM
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Stainless Steel exhaust, and not spending a lot of money don't go hand in hand very often. I would check some exhaust shops in the area. While it's going to be more expensive, it might not be as bad as you think. Depending on the number of bends and welds, amount of tubing involved, etc. And it will solve your problem once and for all. Why put another part on that's only going to rust out the same as the last one did?

Re: Looking for stainless steel y pipe for small block Chevy. [Re: joegreen] #5239881 10/15/19 04:32 AM
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If you can weld it all together then just get some bends from summit and go to town...

Plan b (also not cheap) have the walker Y pipe ceramic coated...


Robert
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Re: Looking for stainless steel y pipe for small block Chevy. [Re: joegreen] #5239883 10/15/19 04:34 AM
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joegreen Offline OP
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Thanks for the input guys. The more i think about it the more i don't think stainless is for me. The reason i asked is because for my Honda it was easy to find a relatively cheap stainless exhaust but not so much for this truck. I am now looking for the cheapest aluminized steel y pipe that will fit without hitting anything or hang to low. Today i an going to take the exhaust off and clean up my manifolds.


1978 Chevrolet k20
Engine: Delo 10w30xle
Transmission: Castrol transmax dex/merc

1984 Mercedes-Benz 300 turbo diesel
Engine: Delo 400 15w40le
Re: Looking for stainless steel y pipe for small block Chevy. [Re: joegreen] #5239892 10/15/19 05:03 AM
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Kestas Offline
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For the 22 years I owned my 91 Grand Marquis, it consumed 7 exhaust systems. If I had the foresight, I would have switched to stainless early on.

Re: Looking for stainless steel y pipe for small block Chevy. [Re: Kestas] #5239955 10/15/19 07:09 AM
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andyd Offline
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Originally Posted by Kestas
For the 22 years I owned my 91 Grand Marquis, it consumed 7 exhaust systems. If I had the foresight, I would have switched to stainless early on.

Or Midas grin2 Wye pipes are the most durable piece of the exhaust. How old is the current pipe?


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Re: Looking for stainless steel y pipe for small block Chevy. [Re: andyd] #5239980 10/15/19 07:24 AM
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joegreen Offline OP
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Originally Posted by andyd
Originally Posted by Kestas
For the 22 years I owned my 91 Grand Marquis, it consumed 7 exhaust systems. If I had the foresight, I would have switched to stainless early on.

Or Midas grin2 Wye pipes are the most durable piece of the exhaust. How old is the current pipe?

I bought the truck in 2012 and whatever y pipe that was in it is what it has. So the old one lasted at least 7 years which is pretty good to me considering the truck got driven in the salt and sits a lot


1978 Chevrolet k20
Engine: Delo 10w30xle
Transmission: Castrol transmax dex/merc

1984 Mercedes-Benz 300 turbo diesel
Engine: Delo 400 15w40le
Re: Looking for stainless steel y pipe for small block Chevy. [Re: joegreen] #5240356 10/15/19 02:51 PM
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I don't have the Grand Marquis anymore. It was my winter car, and I needed to give it up for something more reliable for daily and long distance driving.

The Y-pipe may have looked better than the tailpipe or exhaust, but my experience tells me when the rear two pieces are used up, the Y-pipe is not far behind. Plus it's a lot easier to replace the whole system than separating horribly corroded pieces.

Re: Looking for stainless steel y pipe for small block Chevy. [Re: joegreen] #5240680 10/15/19 07:39 PM
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joegreen Offline OP
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I managed to get the drivers side exhaust manifold off but I cannot get the passenger side off. On the drivers side all of the bolts came out so the manifold came off easy. On the passenger side 3 of the bolts snapped off. I cannot even get the passenger side manifold to budge. I tried hitting it with a 3lb hammer, heating it with a propane torch, prying on it with a breaker bar, and using an air hammer around the broken bolts to break the rust free. Any ideas on how to get this off? I just remembered while typing this i have a really long crow bar I will try tomorrow. Below is picture of snapped bolts circled in red, the drivers side manifold, and the reason i took the manifold off to remove the 3 studs holding the pipe to the manifold.

[Linked Image]
[Linked Image]
[Linked Image]


1978 Chevrolet k20
Engine: Delo 10w30xle
Transmission: Castrol transmax dex/merc

1984 Mercedes-Benz 300 turbo diesel
Engine: Delo 400 15w40le
Re: Looking for stainless steel y pipe for small block Chevy. [Re: joegreen] #5240704 10/15/19 07:58 PM
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Rust isn't the only issue.....Those manifolds tend the shrink, There is a tool to spread it back out......Lisle part#13000. You'll probably need one to reinstall them anyway!

Replacement of both may be the best option.....They didn't use gaskets at the cylinder head from the factory, Those will definitely need surfacing & it's probably not worth it.

I'm aware gaskets are available & everyone uses them, But it's incorrect & causes issues with blown out gaskets.


2001 Chevy Camaro L92/4L80E
2006 Chevy 2500HD LBZ/Allison 1000
2010 Toyota Corolla 2ZR-FE/U341E
2000 Toyota Avalon 1MZ-FE/A541E
Re: Looking for stainless steel y pipe for small block Chevy. [Re: clinebarger] #5240838 10/15/19 10:15 PM
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joegreen Offline OP
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Originally Posted by clinebarger
Rust isn't the only issue.....Those manifolds tend the shrink, There is a tool to spread it back out......Lisle part#13000. You'll probably need one to reinstall them anyway!

Replacement of both may be the best option.....They didn't use gaskets at the cylinder head from the factory, Those will definitely need surfacing & it's probably not worth it.

I'm aware gaskets are available & everyone uses them, But it's incorrect & causes issues with blown out gaskets.

Interesting i didn't know that. When i get the other manifold off i will figure out what to do. This truck is pretty ratty and it mainly sits. Its more of a play toy/plow truck. I don't mind if it's not a perfect seal between the head and manifold.


1978 Chevrolet k20
Engine: Delo 10w30xle
Transmission: Castrol transmax dex/merc

1984 Mercedes-Benz 300 turbo diesel
Engine: Delo 400 15w40le
Re: Looking for stainless steel y pipe for small block Chevy. [Re: joegreen] #5241838 10/16/19 08:55 PM
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joegreen Offline OP
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Currently I am at the point where I cannot get the passenger side manifold off so I think I am going to cut it off. I tried my crow bar on it and it does not budge one bit. Only the truck shakes back and forth. Time is getting short and its starting to get colder out. Also I saw this rusty looking spacer attached between the passenger manifold and the pipe. It turns out it is the heat riser. I did some googling to discover what it was. Mine is missing the whole weight and spring section. So I will buy new manifolds, heat riser, and aluminized pipes and just be done with it. I will be finished with school in a few years and once I have a real job with real money I can deal with it the next time it needs something exhaust related. My old manifolds are so rusty and there are not even threads anymore for the three studs that hold the pipe to the manifold.


1978 Chevrolet k20
Engine: Delo 10w30xle
Transmission: Castrol transmax dex/merc

1984 Mercedes-Benz 300 turbo diesel
Engine: Delo 400 15w40le
Re: Looking for stainless steel y pipe for small block Chevy. [Re: joegreen] #5242697 10/17/19 07:21 PM
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P10crew Online Content
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Around here almost every exhaust shop does stainless and y pipes are and have been normal every day deals.
Only down dude is that they do mig welding at the joint and it’s steel mig. And no purging

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