rockfangd
Contributor
Posts: 546
Age: 27
Loc: Utica ny
Reg: 04-13-10
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05-16-12 09:33 PM - Post#2226723
Well the time has come for me to replace my exhaust. My right manifold is bad at the flange.Very loud. 1990 k1500 5.0l manual
Anyway I have my mind set on headers with no crossover. I want 2 seperate pipes that come out just forward of the rear wheels. The mufflers if needed would be under the cab. Just a thought.
Another thought has crossed mine. I love the setup on the 96+ that has 2 pipes into the muffler and 2 pipes out to rear. Book shows 96-99.
Has anyone ever retrofitted a 96-99 ecxhaust on a 88-94. Please feel free to give me opinions.
I want to replace everything from the engine back.
thanks all
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 navygunner08
Silver Supporting Member
Posts: 611
Loc: New London, CT
Reg: 02-13-11
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05-17-12 07:02 AM - Post#2226796
In response to rockfangd
If you have some welding skills then you can fabricate an exhaust pretty easily from scratch. I would advise against the 2 separate pipes. It has been proven time and time again that a balance pipe (just a straight piece of pipe connecting both sides) or an X-pipe connecting the 2 sides together improves the exhaust flow capability substantially. You can still rout it the way you want to in front of the tires and still fit a balance pipe or X-pipe in there.
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rockfangd
Contributor
Posts: 546
Age: 27
Loc: Utica ny
Reg: 04-13-10
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05-17-12 10:23 AM - Post#2226842
In response to navygunner08
thank you for your advice. Has anyone here got a setup that comes out just front of the rear wheels.
I do welding but dont have a pipe bender.
I am stiill liking the 96-99 setup. am really curious if it would go onto my 90
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 someotherguy
Moderator
Posts: 23385
Age: 43
Loc: Texas
Reg: 08-01-03
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05-17-12 11:57 AM - Post#2226867
In response to rockfangd
If you grabbed an entire 96-up setup from a truck with the same wheelbase, you'd probably have to modify it at the manifold end as the Vortec manifolds are cast a little different, if I recall. Not the same exit orientation on the manifolds and possibly not the same seal style, but it's been a while since I had them side by side for comparison.
Richard
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nickmac
Frequent Contributor
Posts: 1040
Loc: Scandia, PA
Reg: 02-13-07
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05-17-12 05:58 PM - Post#2226967
In response to someotherguy
I have stock single exhaust with the pipe coming out in front of the rear tire. I took a 45° bend and short piece of straight pipe after the muffler. It improved the flow quite a bit over the old longer tailpipe.
Dan
'91 Chevy Ext. Cab 5.7 4x4
'05 Chevy TrailBlazer 4.2 4x4
'02 Pontiac Bonneville 3.8 |
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rockfangd
Contributor
Posts: 546
Age: 27
Loc: Utica ny
Reg: 04-13-10
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05-17-12 09:49 PM - Post#2227048
In response to nickmac
see I need manifolds anyway but I was thinking headers would improve flow and sound. But dont know if 96+ manifolds would blt up to my 90
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navygunner08
Silver Supporting Member
Posts: 611
Loc: New London, CT
Reg: 02-13-11
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05-18-12 01:38 AM - Post#2227063
In response to rockfangd
Richard, I dont think they are different. My friends '96 looks very similar to my '94. I am pretty sure the exhaust runners are in the same location, but the collector locations might have moved.
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someotherguy
Moderator
Posts: 23385
Age: 43
Loc: Texas
Reg: 08-01-03
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05-18-12 05:32 AM - Post#2227098
In response to navygunner08
That's exactly what I'm saying, the exit area (collector) is different, requiring modification to the head pipes.
Also, the driver's side 96-up manifold is going to have the EGR tube port which you'll need to block off. And, it won't have a bung for the O2, which the 90 would locate it there. Great opportunity to convert to a heated three-wire sensor further downstream, anyway.
Passenger side 96-up manifold will not have the sheetmetal ducting for the heat riser tube; not important to many people but in a lot of states with emissions test it will fail the visual inspection. I actually had an inspector in TX fail me simply for the flex hose being missing. (I "solved" this on my current truck by grinding the rivets off for the ductwork, and using the air cleaner housing from a 3/4 ton that had no heat riser at all - looks dead stock)
Richard
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rockfangd
Contributor
Posts: 546
Age: 27
Loc: Utica ny
Reg: 04-13-10
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05-18-12 09:03 PM - Post#2227395
In response to someotherguy
I compared the manifolds and they look different where they mate to the heads. But I wonder if the flanges are the same.
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rockfangd
Contributor
Posts: 546
Age: 27
Loc: Utica ny
Reg: 04-13-10
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06-16-12 07:34 PM - Post#2238023
In response to rockfangd
Update. My funding wont allow me to replace the exhaust this year but I have good news.
today I removed the flange from the rightt manifold. The studs are shot.So I pulled the manifold and am going to replace the studs. Ido have a question though.
are the manifold to head bolts metric of standard?
Can regular bolts be used instead of buying the set? Seems not many places carry the set around here and they list left side only. What is the difference in the bolts on the left side as to the right?
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someotherguy
Moderator
Posts: 23385
Age: 43
Loc: Texas
Reg: 08-01-03
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06-17-12 06:09 AM - Post#2238159
In response to rockfangd
Manifold to head? Pretty sure they're standard. Take one with you to the hardware store and use their bolt/pitch gauges or buy some.
Left side would be different because you have a couple studs up front to hold the power steering pump side support bracket. No harm in using those on the passenger side as well other than appearance.
Richard
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rockfangd
Contributor
Posts: 546
Age: 27
Loc: Utica ny
Reg: 04-13-10
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06-17-12 09:59 AM - Post#2238236
In response to someotherguy
thanks. I thought they looked standard. It is hard to tell. Are the manifold bolts any different than regular bolts?
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 jham0077
"2nd Year" Silver Supporting Member
Posts: 320
Age: 36
Loc: Greenville, Il.
Reg: 11-04-11
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06-17-12 12:17 PM - Post#2238286
In response to rockfangd
A good set of headers is gonna cost you some bucks. A cheap set will have you changing gaskets every month. I think manifold bolts maybe heat treated. The amount of time it takes them to corrode will be the difference. I'm pretty sure they're standard thread.
Keep throwing money at it, it'll get better...
95 Tahoe 5.7 w/5 spd
Gone but not forgotten,
87 LWB 4x4 5.0 w/3 spd granny,
84 SWB 4x4 5.7 w/3 spd granny,
93 Full Size Blazer 5.7 w/5 spd,
97 Step-side Vortec w/5 spd.
I like shifting gears. |
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rockfangd
Contributor
Posts: 546
Age: 27
Loc: Utica ny
Reg: 04-13-10
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06-18-12 11:35 PM - Post#2238985
In response to jham0077
well excellent news. I should have my truck running tomorrow. I cant wait. I love driving my truck.
I put my welding skills to good use and reinforced the manifold around the studs, I ended up welding the studs to the manifold because the threads werent too good after removing the old studs. It should definately be good for awhile.
I cant wait. Will post update tomorrow.
Thank god for welding. It is a huge money saver. I can weld like crazy and save alot
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rockfangd
Contributor
Posts: 546
Age: 27
Loc: Utica ny
Reg: 04-13-10
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06-19-12 10:24 PM - Post#2239332
In response to rockfangd
well it went well today. Back up and running. Too quiet now. But am very happy to be back in my truck. I love the fact that I installed the 91 only cluster with the tach. I love having tach.
Its funny I have 2 cadillacs but cant stand not driving my truck for more than a week. thanks for all the help.
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