Duramax Diesels Forum Truck of the Week
  #61  
Old 10-01-2018, 06:03 PM
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Originally Posted by NC-smokinlmm View Post
Long tubes are worth the money, shorties are no better than manifolds...

Kooks has a split the difference approach, I've been running a set for over a year and love them...
I tend to agree....I installed edelbrock shorties back in the day on my 2000 5.3 1/2 ton and didn't notice much of a gain. If your manifolds aren't shot and leaking I'm not sure if its worth the coin. What else are you planning in terms of exhaust? When i installed the LT's I had planned on removing the cats and running only some sort of highflow mufflers. I think the cats on those trucks are pretty damn restrictive. I had the Lt's through the cats and just had some local exhaust shop run some exhaust through some bullet mufflers.
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  #62  
Old 10-02-2018, 08:21 PM
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I agree the shortys lose the low end power but the big block should have plenty of that. The shortys or whatever will gain on the top end. The factory manifolds are total shit just like rest of the motor. The factory cats are pretty good. But if they burn the oil like most of them do then the cats could be full of crap. I will check them out. Plan on is headers back exhaust all new. Then go from there. It seams like a dog to me. But I'm just trying to figure out which route to take first.
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  #63  
Old 10-02-2018, 10:07 PM
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the 01 02 trucks still had frame mounted fuel filters under the driver door I believe. Have you changed it?
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  #64  
Old 10-03-2018, 06:50 PM
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Originally Posted by graystonelbz View Post
the 01 02 trucks still had frame mounted fuel filters under the driver door I believe. Have you changed it?
Yep fixing to change it. Forgot to mention it needs plugs bad also. After sitting for 8 months it ran like shit for 20 minutes. Cylinder 7 had 1800 misfires. And others had many also. But it's clearing up. I'll change the fuel filter and plugs Friday.
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  #65  
Old 10-05-2018, 06:15 PM
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Well wife loves the truck and took it over lol. Friday night and she wanted to clean on it lol. But that means I get my lbz back haha. It's been a fun project. Still want to hit rod it though. She's all in. Update is got a lot of new parts coming. All new pullys for the whole serpentine system and some kryptonite tie rods probably overkill. But it's been fun. And a lot more fun to come. Decided it needs cam and exhaust pronto.
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  #66  
Old 10-05-2018, 06:19 PM
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Also tune needs to happen. I've been wanting efi live so I may just play with it and see what happens. Here's some pics

Last edited by duramax on fire; 10-06-2018 at 07:35 AM.
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  #67  
Old 10-07-2018, 05:27 PM
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where are the pics?
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  #68  
Old 10-08-2018, 09:02 PM
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Shoot i was float Craigslist found couple 01-04 2500 suburban 4x4 with 8.1s and claiming to have Allison's behind them..

Truck looks nice
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  #69  
Old 10-09-2018, 08:26 AM
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Originally Posted by malibu795 View Post
Shoot i was float Craigslist found couple 01-04 2500 suburban 4x4 with 8.1s and claiming to have Allison's behind them..

Truck looks nice
Must be special ones lol. Some people think they have the allisons but they didn't come with them. 4l85s I believe. Wasn't enough tunnel room for the allisons.

Thanks
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  #70  
Old 10-09-2018, 09:39 AM
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Yep 4l85 behind the 8.1 and 6.6 in the Vans as well... all the 6.0 got 4l80

Actually thinking about buying one of them
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Last edited by malibu795; 10-09-2018 at 09:50 AM.
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  #71  
Old 10-09-2018, 10:25 AM
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I'm curious how the truck is running if you have changed the fuel filter and plugs....its been 11 or so years but I don't remember my 8.1's feeling like dogs at all.
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  #72  
Old 10-09-2018, 11:10 AM
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I put plugs and fuel filter in. Also cleaned up kn air filter. It had ngk plugs in it. Those 3 things definitely helped out some. I still have a feeling I'm dealing with a plugged up cat. Next chance I'm going to have a look at them. Or the o2 sensor is getting slow on bank 2.
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  #73  
Old 10-09-2018, 04:30 PM
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I'm no expert, but when i was messing with those trucks everyone told me to get rid of the cats if possible or get some aftermarket high flows.
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