Re: Project 68 k10 LWB..aka "The Hulk"
 

That's right you know this truck!!!

Re: Project 68 k10 LWB..aka "The Hulk"
 

I guess he won this weekend finally got things squared away I guess. He fought that suspension for a while

Re: Project 68 k10 LWB..aka "The Hulk"
 

Looked what I picked up today. It's a epoxy primed cab with all the rust repair done. It does have a dent in the driver rocker that may need to be replaced. But it is way better then the one I had. Going to get it off the trailer and set on the frame sometime this week and see how it looks
Happy Memorial Day everyone.

Re: Project 68 k10 LWB..aka "The Hulk"
 

Another picture

Re: Project 68 k10 LWB..aka "The Hulk"
 

Nice, is this the 72 cab you scored earlier?

Re: Project 68 k10 LWB..aka "The Hulk"
 

No this is a different one... The first cab I bought had a few bad spots in the roof. A paint and body friend said if you could find another cab that would be best as the first cab would take some work. The guy I picked this up from had all the rust repair performed over a year ago, but it has sat outside so the epoxy primer is like chalk. The best part is that I will have to repair the dent in the rocker and the rest should be good to go.
I am not a paint and body guy so this is not my strong suit.

Re: Project 68 k10 LWB..aka "The Hulk"
 

I have a question regarding exhaust after looking at DWilber's project.
Has anyone ran the header exits into a 3" exhaust pipe and run out the back on our model trucks?
I was thinking it would be different and should scavenge well but I am not an exhaust expert. The motor in the truck is a 4.8L LY2 with a XR259HR COMP cam.
Any comments?

Re: Project 68 k10 LWB..aka "The Hulk"
 

I never ran 3" pipe but i had 2 1/2 duals and my truck is estimated at 325hp, i went to get it re-dueled and both the performance places i went to said that with duals 2 1/4" pipe will flow fine up to 400HP any larger and your taking away bottom end, which tells me that 2 1/2" duals will probably accommodate about 5-550 HP.

Google this and you will find calculators for pipe size, maybe a page or tow that talks about the subject.

"exhaust pipe diameter and flow rate"

Re: Project 68 k10 LWB..aka "The Hulk"
 

Swamp thanks for the comments.
My sons 5.3 is 2-1/3" duels it's sounds and runs good. I was wondering if anyone had ran the headers into one 3" pipe? I haven't seen it. The never vehicles yes but not the older ones. I will check out the calculators. Other than deisel trucks dual exhaust are what most run on gas trucks

Re: Project 68 k10 LWB..aka "The Hulk"
 

If you find a flow chart and figure out what your engine flows via HP then you can come up with a single pipe size, dosn't really matter if its new or old, its all a matter of the flow rate ect., performance shops will probably know the answer off the top of their heads.

Re: Project 68 k10 LWB..aka "The Hulk"
 

How do you think it would sound? Would dual sound better?

Re: Project 68 k10 LWB..aka "The Hulk"
 

According to this a 3" pipe would handle 339 hp.

Re: Project 68 k10 LWB..aka "The Hulk"
 

probably sound a little deeper than a stock single exhaust due to diameter, but what mufflers of course is the variable.

Re: Project 68 k10 LWB..aka "The Hulk"
 

Magnaflow, flow master, those are the popular ones right? I looked on YouTube but really can't find anything but catback systems for single exhaust so that tells me true duals would be the best.

Re: Project 68 k10 LWB..aka "The Hulk"
 

Since I am at this point right now in my build I have done a lot of looking regarding pipe size/headers etc. One thing I have read and heard over and over is don't go too big or it will rob torque. Velocity is also a key factor and if pipes are too large velocity is lost. Outside of that each engine hp combo is different.
I will be using 2.5" pipes to accommodate upgrades to the motor in the future, but that is probably even a little big for my 6.0L with roughly 328hp. Just my 2 cents

Chris

Re: Project 68 k10 LWB..aka "The Hulk"
 

Chris thanks for the 2 cents...
On my sons 5.3 LC9 we went with 2.5" duals with 40 flowmasters. The stock motor was 320 HP before doing anything to it. Not sure if it would have been better to go with 2.25 or not. with the tune and upgrades it runs strong. What do you think on running two 2-1/2" in to one 3"? pros/cons???
Thanks
Scott

Re: Project 68 k10 LWB..aka "The Hulk"
 

Only one way to find out give it a try. I ran 3" duel exhaust 40 series Flow masters in my 84 Chevy 454 engine about 300 hp and it worked good at idle it was quite at full throttle I gat a couple of tickets. I installed 3" exhaust in my 73 Plymouth 390 stroker motor and it is way to loud at idle or full throttle. for my 71 Chevy I installed 2-1/2" duel exhaust with Magna Flow mufflers it will be a while before I get it running. Then theirs my Ram 2500 4" single exhaust straight pipe with tuner and it runs like a bat out of hell and quite at idle not bad at full throttle.

Re: Project 68 k10 LWB..aka "The Hulk"
 

Hey Scott.
It is my understanding that velocity increases as the passage way reduces in size. Seems logical to me anyway. Just like reducing pipe size to increase water pressure at the outlet. For headers, I have read that 1 5/8 primaries into 2.5 collectors and staying with 2.5" duals all the way is best. But sometimes headers combos that actually fit don't help. As long as 3" is reduced to to 2.5" velocity should be effected in a good way. Honestly I am not sure about dual 2.5" into single 3". That may have a negative effect on velocity in the form of scavenging or back pressure if the 3" doesn't have enough capacity for the cfm being jammed thru it. I think 3.5 or 4" would probably yield better results but I would look to a pipe calculator to get better numbers. In general I doubt if any of us would feel the difference in our seats. I think you do the best you can with budget and what will fit your rig while trying to apply common sense.

Re: Project 68 k10 LWB..aka "The Hulk"
 

The picture below is what I was thinking. Please don't. I know I can't draw lol.

I understand the idea of high velocity in a small pipe with back pressure verse larger size less back pressure and Low velocity. The above chart reads in cfm flow and hp. So single 3" can flow 747cfm and 339 hp. That would say that the 243 heads I have on the motor need to flow 373.5 cfm each. Which I don't think this motor can do NA. The hp number is what has me puzzled. My 08 Duramax has 3.5" after the turbo and before the cat and 4.5 after thru a single muffler (can't remember the brand of the catback system ) motor is 325 hp 600+ torque stock. Probably not the same since it's an oil burner.
I am just thinking it would be different. Maybe put a large nasty chrome tip on it. ;)

Re: Project 68 k10 LWB..aka "The Hulk"
 

OK so.....
This is what my mind comes up with(based on the above chart)
2.5 pipe = an area of .034ft2 at 509cfm = 14970.6 ft/min or 249.5 fps

3.0 pipe = an area of .049ft2 at 747cfm = 15244.9 ft/min or 237.4 fps

So bigger pipe more cfm but less velocity. 5% less velocity in the 3" then the 2.5"
now that we have had an algebra lesson.....it all comes down to sound! What to you guys think it will sound like? good or bad?

Re: Project 68 k10 LWB..aka "The Hulk"
 

Magnaflow gets my vote, deeper sound, Flowmasters are a more raspy sound, that said i run Magnaflows on the rat. My DD originally had dual Glass packs and the system ran side by side, the packs burned out but the forward pipes were still solid so i left them and had a 2 in 2 out 70 series Flowmaster installed, but also has 2 20" resonators installed so its deeper and not as raspy sounding.

Start combing Youtube and the MFG sites for sound clips.

I forget what mufflers i have but they are the largest body Magnaflows that were available, i wanted quiet after 20 years of headers and flowmaster 40's. :lol:

https://www.youtube.com/watch?v=ZyYm...ature=youtu.be

https://www.youtube.com/watch?v=wH4Qq3m7PPo

Re: Project 68 k10 LWB..aka "The Hulk"
 

The way I look at it is it's your sons truck make on the loud side that way you will hear him coming home late at night after party'n all night or nit

Re: Project 68 k10 LWB..aka "The Hulk"
 

Loud I get. The partying I don't think so!!!

Thanks guys I will check out videos on it. Not sure what I showing to but thanks for helping me think about it football practice is taking up a lot of time. Next week is no practice so hopefully I can get back on the truck.

Re: Project 68 k10 LWB..aka "The Hulk"
 

Hulk is coming along really nice ! :metal:

Re: Project 68 k10 LWB..aka "The Hulk"
 

Thanks sleepertruck72
I haven't been able to really work on it this past couple weeks hopefully I can get on it soon.

Re: Project 68 k10 LWB..aka "The Hulk"
 

It's gonna sound great and I like your idea for this truck. I've had a few people suggest this style exhaust for projects in the past and curious to see how you guys like it once done.

Re: Project 68 k10 LWB..aka "The Hulk"
 

Thanks Brett,

I am thinking it would be different to have a large pipe exhaust.

Scott

Re: Project 68 k10 LWB..aka "The Hulk"
 

I think this will look pretty cool. Large single pipe on the back. It will probably end up flowing better than duals. Lookin forward to seeing that one put together.
Chris

Re: Project 68 k10 LWB..aka "The Hulk"
 

It will be different for sure...
so what muffler would you recommend? Size? 3" or 3.5"?

Re: Project 68 k10 LWB..aka "The Hulk"
 

Also spent some money and bought HP Tuners. going to play with my others sons 5.3 LC9 truck...

Re: Project 68 k10 LWB..aka "The Hulk"
 

Same size as your extension pipe from header/manifold to muffler. Once you come off header and go to single pipe, it should stay the same the rest of the way. There is some info about stepping up, but none I've found that
shows proof of a performance gain. I am a flomaster guy so that's what I would get.

Let me know how tough the learning curve is with HP tuners. I use computers every day and have been thinking about buying and getting to know the ins and out of tuning the LS motors. Like anything, I'm sure it's a matter of understanding the user interface, but have never heard how difficult that is
self teaching.

Chris

Re: Project 68 k10 LWB..aka "The Hulk"
 

Chris thanks for the information that is what is great about this site a lot of info. I like the sound of flomasters also just not sure how a single muffler (of any kind) will sound so need to do some research.

I paid about 400$ on the C10 truck tune and it still needs some trans tuning so I don't want to spend anymore money to someone else. figure I will spend it on learning material....All the tuners on this site say read ,read, read, and read some more!!!
so now I just need to learn to read!!!

Re: Project 68 k10 LWB..aka "The Hulk"
 

I'm thinking about tuning the engine as well. I hear stories about guy and tuner blowing up engines tuning them. I'm installing wide band O2 sensor on my truck so I can keep an eye on fuel air mixture.

Re: Project 68 k10 LWB..aka "The Hulk"
 

Yes I figured I learned how to weld and do all the other mechanical stuff. It might take me a while but I should be able to get the computer stuff done. As for blowing up stuff I think that's people trying to do more with the tune then there abilities I am going to start with the easy stuff like trans shift points and such before I really start tuning anything on the k20. Understanding the terminology I think will be the toughest to learn and Understand

Re: Project 68 k10 LWB..aka "The Hulk"
 

It will sound great with a single, don't sweat the sound part too much, just run stock diameter pipes out of the headers or manifold to where they tie together, i don't know if there is a pre made collector out there or not.

Another option may be to find a dual in single out muffler, something to look into.

Re: Project 68 k10 LWB..aka "The Hulk"
 

This is a dual 2.5 to a single 3" collector
Magnaflow collector

I don't know of any dual input with a single discharge mufflers off the top of my head anyways...

I want to run SS so I will need to get bends and pipe. other than the normal places to get exhaust stuff any recommendations on fitting and pipe? I was thinking about SS process piping for exhaust pipe .063 wall in 2.5" and .083 in 3"
This will also give me a reason to buy a TIG welder!!! Darn!:devil:

Re: Project 68 k10 LWB..aka "The Hulk"
 

Magnaflow makes a singe/dual muffler that is reversible
anyone know anything about them?
not set on magnaflow but just checking their website for ideas...

magnaflow 13763 7" Round muffler

Re: Project 68 k10 LWB..aka "The Hulk"
 

After doing a little research. There a few reversible mufflers on the market. I didn't know that.

Borla Pro xs

Re: Project 68 k10 LWB..aka "The Hulk"
 

Sorry. Can't help you on the stainless pipe but i'm suresomeone on this forum can.

Re: Project 68 k10 LWB..aka "The Hulk"
 

no problem...

Anyone use these guys???

http://www.siliconeintakes.com/