minimum ground clearance on the street? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Oborny71 · 05-30-2005, 01:11 PM

what is the minimum ground clearance required for the street? the 3 1/2" exhaust i'm putting on my lowered 67 is is only gonna clear the ground by the 3" . besides speed bumps, is this gonna be ok?

Oborny71 · 05-30-2005, 01:36 PM

pics to follow

fastbagged68 · 05-30-2005, 01:49 PM

You could do what I did... box the frame and cut a whole through the frame and run your exhaust through the frame and keep it above your frame rails... or can C-notch your frame to clear exhaust...

SCOTI · 05-30-2005, 02:27 PM

You'll clear alot of road stuff but eventually you'll hit something.

Why not try & tuck that up as much as possible within the frame rails? In those pics it looks like the entire system is below the bottom of the rail. I understand it's 3.5" dia tubing, but mine has 3" & you can't see any of it & it dumps @ the rear-end housing.

AirMale · 05-30-2005, 05:12 PM

what headers are you running?

Oborny71 · 05-30-2005, 08:03 PM

the headers are hooker super comps, 2" primaries, 3 1/2" collectors. the problem is more in the headers i guess. they hang below the tranny crossmember, so in order to run the rest of the exhaust, it has to be below it too.

71Dragtruck · 05-30-2005, 08:22 PM

I put a tubular cross member on my tranny, it has a u shaped bend under the tranny. I then used mandrel s bends to take my exhaust up into the frame rails.

AirMale · 05-30-2005, 08:43 PM

Most guys have more luck with the Hooker competition headers #2455 instaed of the "super-comps". They tuck up between the frame rails nice.

**N2TRUX** · 05-30-2005, 10:20 PM

You may as well go ahead and pull that off and lay it in the back of your truck. It's going to end up there anyway after you drag it off. Unless your truck is bagged, and I know it's not, that never going to last....

Elsie72 · 05-30-2005, 10:38 PM

Damn! That's exactly why I'm considering mid-length or shorty headers. I know it might not be the best for outright performance, but I would be nervous every time I went over a bump in the road.

Right now I've got 2 1/2" pipes, tucked above the bottom of the frame rails, over the transmission cross-member, and I've yet to drag anything.

XXL · 05-31-2005, 08:36 AM

You're making those of us with exceptionally low trucks wince. As N2TRUX has already indicated, those are going to fall into the "I used to have these on my truc" category if you actually drive anywhere. You'll be extra careful, but that one time you're forced into the lane with the big bump and the 18-wheeler is riding your bumper, you're going to shred them.

72MARIO · 05-31-2005, 05:33 PM

You need to find another set of headders. And tuck it up in the frame.

That will never last.

FirstGen · 06-03-2005, 03:57 PM

I went to midlengths after the same problems. I lost no power actually with the ported MACs I now have...

speedracer · 06-03-2005, 04:46 PM

with my 4-6 drop I caught a rock on a dirt road going about 15mph It tore the flange right off the header. I'm running shorty hedmen elites now. 4" more ground clearance. Worst part of learning this the hard way was the 3" stainless and flowmasters I had to throw away because of speedbumps and dips in the highway; scraps, rips, and crushed pipes everwhere.

72MARIO · 06-04-2005, 01:39 AM

http://www.nwautofab.com/store/custo...&cat=11&page=1

Try these motor mounts and a set of camaro shortys. I would get the hedders first. If they hit use these mounts. I have them on my small block and they clear my headman shortys.Small block thought..

05-30-2005, 01:11 PM	#1
Oborny71 Registered User Join Date: Apr 2001 Location: Lincoln, Nebraska Posts: 587	minimum ground clearance on the street? what is the minimum ground clearance required for the street? the 3 1/2" exhaust i'm putting on my lowered 67 is is only gonna clear the ground by the 3" . besides speed bumps, is this gonna be ok? __________________ 67 Chevy SWB - goal of a 1,000 hp weekend cruiser Last edited by Oborny71; 05-30-2005 at 01:20 PM.

05-30-2005, 02:27 PM	#4
SCOTI Registered User Join Date: Apr 2001 Location: DALLAS,TX Posts: 22,066	You'll clear alot of road stuff but eventually you'll hit something. Why not try & tuck that up as much as possible within the frame rails? In those pics it looks like the entire system is below the bottom of the rail. I understand it's 3.5" dia tubing, but mine has 3" & you can't see any of it & it dumps @ the rear-end housing. __________________ 67SWB-B.B.RetroRod 64SWB-Recycle 89CCDually-Driver/Tow Truck 99CCSWB Driver All Fleetsides @rattlecankustoms in IG Building a small, high rpm engine with the perfect bore, stroke and rod ratio is very impressive. It's like a highly skilled Morrocan sword fighter with a Damascus Steel Scimitar..... *Cubic inches is like Indiana Jones with a cheap pistol.*

05-30-2005, 05:12 PM	#5
AirMale Senior Member Join Date: Jan 2003 Location: Atlantic City, NJ Posts: 1,073	what headers are you running? __________________ 86 SWB 9.0 LITER T-400-OD 4.11 eaton-4/5 drop Best 1/4 12.51 @112mph no traction

05-30-2005, 08:03 PM	#6
Oborny71 Registered User Join Date: Apr 2001 Location: Lincoln, Nebraska Posts: 587	the headers are hooker super comps, 2" primaries, 3 1/2" collectors. the problem is more in the headers i guess. they hang below the tranny crossmember, so in order to run the rest of the exhaust, it has to be below it too. __________________ 67 Chevy SWB - goal of a 1,000 hp weekend cruiser

05-30-2005, 08:22 PM	#7
71Dragtruck Registered User Join Date: Jun 2004 Location: Saskatchewan, Canada Posts: 1,368	I put a tubular cross member on my tranny, it has a u shaped bend under the tranny. I then used mandrel s bends to take my exhaust up into the frame rails. Attached Images Last edited by 71Dragtruck; 05-30-2005 at 08:25 PM.

05-30-2005, 01:36 PM	#2
Oborny71 Registered User Join Date: Apr 2001 Location: Lincoln, Nebraska Posts: 587	pics to follow Attached Images __________________ 67 Chevy SWB - goal of a 1,000 hp weekend cruiser Last edited by Oborny71; 05-30-2005 at 01:39 PM.

05-30-2005, 01:49 PM	#3
fastbagged68 Registered User Join Date: Jun 2002 Location: Tri Valley California Posts: 792	You could do what I did... box the frame and cut a whole through the frame and run your exhaust through the frame and keep it above your frame rails... or can C-notch your frame to clear exhaust...

05-30-2005, 08:43 PM	#8
AirMale Senior Member Join Date: Jan 2003 Location: Atlantic City, NJ Posts: 1,073	Most guys have more luck with the Hooker competition headers #2455 instaed of the "super-comps". They tuck up between the frame rails nice. Attached Images __________________ 86 SWB 9.0 LITER T-400-OD 4.11 eaton-4/5 drop Best 1/4 12.51 @112mph no traction

05-30-2005, 10:20 PM	#9
N2TRUX Happy to be here Join Date: Mar 2000 Location: Cypress, TX Posts: 39,021	You may as well go ahead and pull that off and lay it in the back of your truck. It's going to end up there anyway after you drag it off. Unless your truck is bagged, and I know it's not, that never going to last....

05-30-2005, 10:38 PM	#10
Elsie72 Chinook Arch Join Date: Feb 2005 Location: High River, Alberta, Canada Posts: 218	Damn! That's exactly why I'm considering mid-length or shorty headers. I know it might not be the best for outright performance, but I would be nervous every time I went over a bump in the road. Right now I've got 2 1/2" pipes, tucked above the bottom of the frame rails, over the transmission cross-member, and I've yet to drag anything. __________________ 1972 GMC 1500 Custom - Bought used by Grandpa in '74, currently back on the road after a long hiatus. Elsie's truck 2.5" dual exhaust with Hooker Aero Chambers Holley 670 Street Avenger Edelbrock Performer RPM on GMPP 290HP 350 ECE drop 3.5/5

05-31-2005, 08:36 AM	#11
XXL Señor Member Join Date: May 2002 Location: Edge of the world Posts: 5,367	You're making those of us with exceptionally low trucks wince. As N2TRUX has already indicated, those are going to fall into the "I used to have these on my truc" category if you actually drive anywhere. You'll be extra careful, but that one time you're forced into the lane with the big bump and the 18-wheeler is riding your bumper, you're going to shred them. __________________ Craigslist \| ebay \| Engrishtees \| www.myattitudesucks.com \| Follow me on Twitter

05-31-2005, 05:33 PM	#12
72MARIO Registered User Join Date: Nov 2000 Location: Huntsville Ontario Canada Posts: 4,051	You need to find another set of headders. And tuck it up in the frame. That will never last. __________________ 1968 Suburban numbers matching all original truck now equipped with 6.0/4L80 on Accuair http://67-72chevytrucks.com/vboard/s...d.php?t=625017 1967 C/20 6.0/4L80 Roofing Truck 1990 V2500 Suburban "Plow Truck" 2005 TAHOE DD

06-03-2005, 03:57 PM	#13
FirstGen Just Don't Stop! Join Date: Feb 2004 Location: Dallas Posts: 1,239	I went to midlengths after the same problems. I lost no power actually with the ported MACs I now have... __________________ 1968 C10 build in process TT LSA/6L90e/9"

06-03-2005, 04:46 PM	#14
speedracer Blank Join Date: May 2005 Location: Southington, CT Posts: 221	with my 4-6 drop I caught a rock on a dirt road going about 15mph It tore the flange right off the header. I'm running shorty hedmen elites now. 4" more ground clearance. Worst part of learning this the hard way was the 3" stainless and flowmasters I had to throw away because of speedbumps and dips in the highway; scraps, rips, and crushed pipes everwhere.

06-04-2005, 01:39 AM	#15
72MARIO Registered User Join Date: Nov 2000 Location: Huntsville Ontario Canada Posts: 4,051	http://www.nwautofab.com/store/custo...&cat=11&page=1 Try these motor mounts and a set of camaro shortys. I would get the hedders first. If they hit use these mounts. I have them on my small block and they clear my headman shortys.Small block thought.. __________________ 1968 Suburban numbers matching all original truck now equipped with 6.0/4L80 on Accuair http://67-72chevytrucks.com/vboard/s...d.php?t=625017 1967 C/20 6.0/4L80 Roofing Truck 1990 V2500 Suburban "Plow Truck" 2005 TAHOE DD



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