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#1 |
Registered User
Join Date: Nov 2015
Location: Colfax California
Posts: 1,644
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Exhaust installation
Hey guys I have a 1970 C10 LWB and I'm getting ready to do 3" exhaust all the way back to the bumper. Should I wait until after I lower the truck so I don't run into clearance issues or will it be fine. Also is the some specific route the exhaust guys should be running the pipe? I'm going to do a 2/4 drop I think, nothing crazy.
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#2 |
Registered User
Join Date: Aug 2016
Location: Lake Forest, CA
Posts: 2,177
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Re: Exhaust installation
I am about to lower a 70 C10 i just picked up and from what I see, I'm gonna have to hack mine off at the mufflers. It already shows a witness mark of hitting on the passenger side at stock height. And it would hit solid at a 3" drop. I would wait.
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"Work hard, use your vacation days." 1970 C15 GMC Long Bed 1986 C20 Scottsdale 1983 K2500 Sierra Classic Suburban 6.2 Instagram: C10sofOC |
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#3 |
Registered User
Join Date: Jul 2016
Location: Olathe, KS
Posts: 267
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Re: Exhaust installation
I would wait and do it after the suspension mods. There will be unforeseen clearance issues with shock angles or brake lines or air lines.
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1970 GMC K2500 Dis-use is harder on a car than mis-use. |
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#4 |
Registered User
Join Date: Dec 1999
Location: Austin, TX, USA
Posts: 7,717
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Re: Exhaust installation
Wait. And I would seriously reconsider the 3". Loud. Not worth much power. Hard to route over rear axle. Expensive.
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44 Willys MB 52 M38A1 64 Corvette Coupe 68 Camaro 'vert LT1 & TH700 69 Z/28 355 12.6's @110 69 Chevy Short Step 4 1/2"/7" drop 72 Jimmy 4WD 4spd 4" & 35's 02 GMC 2500HD 4x4 Duramax |
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#5 |
Registered User
Join Date: Nov 2015
Location: Colfax California
Posts: 1,644
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Re: Exhaust installation
Is it easy to cut holes for the exhaust to run through the rear crossmember or whatever that peice is that the driveline goes through?
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#6 |
Senior Member
![]() Join Date: Jul 2015
Location: Warrenton VA
Posts: 1,048
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Re: Exhaust installation
Hard or easy is relative to your skill set. If you're already lowering it why not look into something like this https://www.brotherstrucks.com/63-72...tinfo/TAC72HD/ ?? What are you using to lower your truck and how far? But like the others have said, definitely wait to run the exhaust tell your suspension and ride height are figured out and installed.
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71 c-10 Long Bed, under the knife for a No Limit Engineering Wide Ride Chassis Pack and coil over static drop. 07 Silverado Classic 2wd 95 Camaro 427SBC/TH350 |
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#7 | |
Registered User
Join Date: Nov 2015
Location: Colfax California
Posts: 1,644
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Re: Exhaust installation
Quote:
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#8 |
Registered User
Join Date: Nov 2015
Location: Colfax California
Posts: 1,644
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Re: Exhaust installation
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#9 |
Senior Member
![]() Join Date: Jul 2015
Location: Warrenton VA
Posts: 1,048
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Re: Exhaust installation
Happy to help!!
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71 c-10 Long Bed, under the knife for a No Limit Engineering Wide Ride Chassis Pack and coil over static drop. 07 Silverado Classic 2wd 95 Camaro 427SBC/TH350 |
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#10 | |
Registered User
Join Date: Dec 1999
Location: Austin, TX, USA
Posts: 7,717
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Re: Exhaust installation
Quote:
Engine masters did a YouTube on a 2 1/2" vs 3" exhaust on a 650 hp 454. Even on that relatively high output built motor the gain was only 20 hp and that was at the highest rpm range. That test talked me out of 3" for my Camaro.
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44 Willys MB 52 M38A1 64 Corvette Coupe 68 Camaro 'vert LT1 & TH700 69 Z/28 355 12.6's @110 69 Chevy Short Step 4 1/2"/7" drop 72 Jimmy 4WD 4spd 4" & 35's 02 GMC 2500HD 4x4 Duramax |
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#11 |
Registered User
Join Date: Jul 2011
Location: strausstown pa
Posts: 3,394
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Re: Exhaust installation
I set my 67 up for 3" but came across a 2 1/2" "kit" dirt cheap
So to save a buck i used it. Its much louder than i thought it ever would be. Im glad its 2 1/2 cause going over the rear with 3" and a 7" drop wouldve been a huge pita even for a shop too do. I have 3" from headers too the mufflers on my car and 2 1/2 tail pipes and it sounds and flows good. I cant tell ya if it makes any differnce though. But its what fit well. I planned 3" for that too till the shop showed me the bends they would have too make and they came up with the smaller tailpipes idea. My suggestion is too keep it up in the frame though your plans may change on the amount of drop your considering. the last thing you want is knocking off a pipe or huge dents in it. Besides the way your going ya might as well wait till you back halve that truck then get it done🙊
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81 camaro 355 4/spd 342 posi my first love ![]() 67 swb step 454/4spd ott 373 posi 4/7 drop. 2000 s10 zr2 little blue truck that never gets stuck. '74 heald super bronc vt8. tecumseh powered moon rover. |
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#12 | |
Registered User
Join Date: Aug 2013
Location: Calgary, Alberta
Posts: 681
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Re: Exhaust installation
Quote:
My setup is a 402BB making 430hp/460tq and I went with 3" for the potential power gains plus the bigger sound I'm hoping for. I even bought the CCP (CPP?) cross member to route the 3" exhaust through. However, in my case the Hooker headers came out too low, so the exhaust is running under both crossmembers now. However, there was a clearance issue. The exhaust shop had me come in for them to explain. My truck is has a 6" lowering coil in the rear (ECE). Specifically they could not get the 3" exhaust over the axle and around the Super Track Bar easily. They said the only way was with a ton of exhaust cuts + welds that would cost a lot more. So, they did 3" all the way back into the mufflers (with an x-pipe) then 2.5" from the mufflers back. It's all done but I have not had time to head to my mechanic's place to hear it running.
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1972 Cheyenne Super SWB PS, PB, Tach, A/C, Tilt. Drivetrain: Built 402BB, TCI Streetfighter 700R4, 2,500 stall, Eaton posi, 3.73. Suspension/Chassis: ECE 4.5/6.5 drop, CPP nitrogen shocks, CPP front and rear sway bar, CPP cross members. Exhaust: 3" exhaust with x-pipe, Spintech 3000 mufflers, Hooker ceramic coated headers. Best 1/4 mile time: TBD. |
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#13 |
Registered User
Join Date: Dec 1999
Location: Austin, TX, USA
Posts: 7,717
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Re: Exhaust installation
Everyone has a different goal and mine is relatively big power very quietly. I have a loud car to drive and the truck I want quiet. And 3% power gain for all of the negatives I mentioned above just don't make sense on a street car. 12 hp on a 430 horse motor.
I'm building a .030 '69 427 oval port motor. 10:1 compression, smallest nitrous hydraulic roller (extra exhaust duration for better exhaust flow, wider LSA), GM performance parts dual plane, 750 double pumper. The goal is for this install to look and sound like a crate motor install done back in the day. GM steel fuel lines and deep groove pulleys will be used. Aluminum water pump and GM intake will be painted orange. I'm going to attempt angle milling reproduction big block 'vette manifolds to fit truck chassis, run 2 1/2" exhaust through Walker Hemi Turbo mufflers (extra long case). I cut 4" rings into my crossmember to run pipes between frame rails and above the trans crossmember for max clearance. And running mufflers/pipes on my leaf spring truck will be simpler than a coil truck. Great thing about message boards is being able to take advantage of other people's experience and plans. Hopefully OP gets some good bullet points for either way. But as noted, my money is for 2 1/2" under 500 hp. I have a tall dark 498" motor (.070 over tall deck 427, 4.5" crank) that will find a home in the Camaro and the jury is still out on 2 1/2" vs 3". Put I'm leaning 2 1/2" mandrel bent with x pipe as the best of both.
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44 Willys MB 52 M38A1 64 Corvette Coupe 68 Camaro 'vert LT1 & TH700 69 Z/28 355 12.6's @110 69 Chevy Short Step 4 1/2"/7" drop 72 Jimmy 4WD 4spd 4" & 35's 02 GMC 2500HD 4x4 Duramax |
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