Pass exhaust throgh frame??? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

chevy2racr · 01-06-2003, 06:25 PM

ok, wondering about passin exhaust through the frame kinda like below, wondering what reinforcing to do? I fixured bx in around it, put pipein for the exhause to go through, and maybe some gussets, wondering in the if the bars running to the trailing arm crossmember are to supportit more? looks like te frame is boxed a lot too. any Ideas on strength for me?
thanks
Bryce

**1971Stepside** · 01-06-2003, 06:32 PM

I saw that on that particular truck and liked it, but that was a lot of work. I believe the easiest way is to cut holes in your frame crossmembers and feed it within your rails. You can see in mine I used two 4" pieces of steel pipe that was cut 1/2" thick. We then cut out the crossmember and welded them in. Early Classics has more info on how they did this and Slammed67 did this to his truck.

NSANE68!!! · 01-06-2003, 06:32 PM

You can do it like that if you box the frame to reinforce it, or you could notch the frame just like a c-notch and enforce that. Same but different. LOL

chevy2racr · 01-06-2003, 06:45 PM

Jason did too huh step? I was thinkin of exiting outthe sides infront of tires andthought I'd go outinstead, thanks for that idea NSANE didn't even think of notching

Tynee · 01-06-2003, 07:33 PM

Out of curiosity, where's the benefit?

chevy2racr · 01-06-2003, 09:04 PM

its not hanging below the frame

*67Fleetsidedream* · 01-06-2003, 09:22 PM

Way too much trouble for exhaust.

Ben

67cst · 01-06-2003, 09:47 PM

i agree, if i had a truck like slammed or 71 i would b/c it rides so low, like slammed witht he air bags, but if it was my truck (daily driver) i dont think it is worth the bother

crazy longhorn · 01-06-2003, 09:49 PM

Yup, those lowered trucks can cause a guy a lot of work! I have notched my trans crossmember, & built a crossmember for the center carrier(also notched). the exhaust is below the rails, but not more that 2". It works out good with a 3/5 drop & could go a little more without problems. The bodydrop was a chunk of work, but it gets the truck a little lower, & keeps the suspension pcs off the pavement.......it might be worth a thought

chevy2racr · 01-06-2003, 09:54 PM

I wouln't mind more info on a body drop, I don't know anythign about them so I haven't thought of them.. pics and discriptions woud help..

crazy longhorn · 01-06-2003, 10:10 PM

mine was a very minor drop @ 1 1/2".....alot of guys go about 3". The frame horns were cut off ahead of the steer box, dropped & welded back on and boxed. Then the cab mount brackets were removed from the frame & dropped 1 1/2". the cab had a strip cut out from the toe boards to under the seat area(for the rails to stick up through), & a 16 guage 3 sided box was welded back in for clearance. a little padding under the carpet will cover the step in the floor. If you go much more than that 1 1/2", you would be better off cutting the complete center out of the floor & raising tunnel & all. On the box, I cut the lip of the box sides 1 1/2" up, & welded it back on. then finally out back, I used dropdown brackets to get the bumper at the proper height. I dont have any pics of the job, but i think there are a couple guys on the board that do. good luck....crazyL

Low67C10 · 01-06-2003, 10:24 PM

I did this just last week, but I went throuh the frame rail right behind of the trans crossmember . I bought some 4" .125 wall tubing, cut it at 45 degrees and made some boxing plates out of 1/8" steel plate. I made sure to make the boxing plates long enough to cover the hole in the frame and the boxing plate since the tube passes through the frame at a 45 so the holes are staggered. All together it was really easy but I welded the tubes to the boxing plates first and Id recommend welding it all togther at the same time. Also had to tweak some lines and remove the tailight wiring harness while I cut and welded. Its looks awesome and on a low truck is the way to go.

01-06-2003, 06:25 PM	#1
chevy2racr So Many Ideas, So Little Money Join Date: Sep 2001 Location: Marshalltown, IA Posts: 1,610	Pass exhaust throgh frame??? ok, wondering about passin exhaust through the frame kinda like below, wondering what reinforcing to do? I fixured bx in around it, put pipein for the exhause to go through, and maybe some gussets, wondering in the if the bars running to the trailing arm crossmember are to supportit more? looks like te frame is boxed a lot too. any Ideas on strength for me? thanks Bryce Attached Images __________________ 72 Blazer 3/4 ton running gear 4.10s NP205/TH350 350 4in lift half doors 71 C10 with 454 99 S-10 5.1L SBC 700R4 09 Malibu Marshalltown, Iowa

01-06-2003, 06:32 PM	#2
1971Stepside Almost Satisfied Join Date: Mar 2002 Location: Springfield, MO Posts: 2,932	I saw that on that particular truck and liked it, but that was a lot of work. I believe the easiest way is to cut holes in your frame crossmembers and feed it within your rails. You can see in mine I used two 4" pieces of steel pipe that was cut 1/2" thick. We then cut out the crossmember and welded them in. Early Classics has more info on how they did this and Slammed67 did this to his truck. Attached Images __________________ 1971 C10 Stepside. LSx 6.0 with BTR Stage IV, Speed Engineering Headers, 4L80e transmission w/3200 Circle-D Stall. 3.73. Posi. Purchased this truck when I was 17. I started the rebuild (or take apart) in 1993. I have drug it around all over the country in pieces. Finally back on the road in 2021. "I can't complain, but sometimes I still do. Life's been good to me so far."

01-06-2003, 06:32 PM	#3
NSANE68!!! SLICER AND DICIER Join Date: May 2001 Location: Quuen Creek Posts: 1,383	You can do it like that if you box the frame to reinforce it, or you could notch the frame just like a c-notch and enforce that. Same but different. LOL __________________ 01 Tahoe 22's 2/4 drop and tv's 68 chevy money pit 51 chevy belair 95 Honda 900RR 05 GMC Siearra (company truck)

01-06-2003, 06:45 PM	#4
chevy2racr So Many Ideas, So Little Money Join Date: Sep 2001 Location: Marshalltown, IA Posts: 1,610	Jason did too huh step? I was thinkin of exiting outthe sides infront of tires andthought I'd go outinstead, thanks for that idea NSANE didn't even think of notching __________________ 72 Blazer 3/4 ton running gear 4.10s NP205/TH350 350 4in lift half doors 71 C10 with 454 99 S-10 5.1L SBC 700R4 09 Malibu Marshalltown, Iowa

01-06-2003, 07:33 PM	#5
Tynee I miss this truck. Join Date: Dec 2001 Location: Lexington, KY U.S.A. Posts: 2,863	Out of curiosity, where's the benefit? __________________ '07 GMC Acadia SLT. Sweet ride. '08 Crew Cab Z-71 short bed. Really like this truck A LOT.

01-06-2003, 09:04 PM	#6
chevy2racr So Many Ideas, So Little Money Join Date: Sep 2001 Location: Marshalltown, IA Posts: 1,610	its not hanging below the frame __________________ 72 Blazer 3/4 ton running gear 4.10s NP205/TH350 350 4in lift half doors 71 C10 with 454 99 S-10 5.1L SBC 700R4 09 Malibu Marshalltown, Iowa

01-06-2003, 09:22 PM	#7
67Fleetsidedream Wiseass secured himself a BAN Join Date: Nov 2000 Location: MOON!!! Posts: 2,282	Way too much trouble for exhaust. Ben

01-06-2003, 09:47 PM	#8
67cst i love summertime Join Date: Jul 2002 Location: Kelowna BC Posts: 4,303	i agree, if i had a truck like slammed or 71 i would b/c it rides so low, like slammed witht he air bags, but if it was my truck (daily driver) i dont think it is worth the bother __________________ 1967 shortbox stepside Chevy, 365 hp 327, th400. GLOVE BOX LIGHTS FORSALE, click link for info http://67-72chevytrucks.com/vboard/s...d.php?t=273724

01-06-2003, 09:49 PM	#9
crazy longhorn Fabricate till you "puke" Join Date: Jun 2002 Location: Ill Posts: 9,403	Yup, those lowered trucks can cause a guy a lot of work! I have notched my trans crossmember, & built a crossmember for the center carrier(also notched). the exhaust is below the rails, but not more that 2". It works out good with a 3/5 drop & could go a little more without problems. The bodydrop was a chunk of work, but it gets the truck a little lower, & keeps the suspension pcs off the pavement.......it might be worth a thought __________________ 69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears....

01-06-2003, 09:54 PM	#10
chevy2racr So Many Ideas, So Little Money Join Date: Sep 2001 Location: Marshalltown, IA Posts: 1,610	I wouln't mind more info on a body drop, I don't know anythign about them so I haven't thought of them.. pics and discriptions woud help.. __________________ 72 Blazer 3/4 ton running gear 4.10s NP205/TH350 350 4in lift half doors 71 C10 with 454 99 S-10 5.1L SBC 700R4 09 Malibu Marshalltown, Iowa

01-06-2003, 10:10 PM	#11
crazy longhorn Fabricate till you "puke" Join Date: Jun 2002 Location: Ill Posts: 9,403	mine was a very minor drop @ 1 1/2".....alot of guys go about 3". The frame horns were cut off ahead of the steer box, dropped & welded back on and boxed. Then the cab mount brackets were removed from the frame & dropped 1 1/2". the cab had a strip cut out from the toe boards to under the seat area(for the rails to stick up through), & a 16 guage 3 sided box was welded back in for clearance. a little padding under the carpet will cover the step in the floor. If you go much more than that 1 1/2", you would be better off cutting the complete center out of the floor & raising tunnel & all. On the box, I cut the lip of the box sides 1 1/2" up, & welded it back on. then finally out back, I used dropdown brackets to get the bumper at the proper height. I dont have any pics of the job, but i think there are a couple guys on the board that do. good luck....crazyL __________________ 69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears....

01-06-2003, 10:24 PM	#12
Low67C10 Registered User Join Date: May 2002 Location: Southern California Posts: 66	I did this just last week, but I went throuh the frame rail right behind of the trans crossmember . I bought some 4" .125 wall tubing, cut it at 45 degrees and made some boxing plates out of 1/8" steel plate. I made sure to make the boxing plates long enough to cover the hole in the frame and the boxing plate since the tube passes through the frame at a 45 so the holes are staggered. All together it was really easy but I welded the tubes to the boxing plates first and Id recommend welding it all togther at the same time. Also had to tweak some lines and remove the tailight wiring harness while I cut and welded. Its looks awesome and on a low truck is the way to go. __________________ No, Its not a 454



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