Exhaust vs brake-lines - The 1947 - Present Chevrolet & GMC Truck Message Board Network

SCOTI · 06-10-2011, 01:55 AM

I'm starting to determine the routing for the 2.5" exhaust on my 'Recycle' project.

As I was trying to visualize where things were going to go, I noticed that it's pretty cramped where the pipe has to drop down under the manifold on the pass side. There's enough room for the pipe between the starter & frame but I noticed it's going to wind up fairly close (approx 1") to the rear brake-line.

How close is too close??

brad_man_72 · 06-10-2011, 01:26 PM

I had one that rubbed, I didn't NOTICE any problems but kept a cclose eye on it before I did my engine swap, then I re routed the brake lines and pretty much everything else.

SCOTI · 06-10-2011, 01:59 PM

I'm not worried about any contact as the area of concern is where the exhaust pipe does its 90 deg turn after exiting the center dump of the manifold (roughly 9" from where it's attached to the manifold). The brake-line is secured to the x-member & frame in 3 different places all within 6-10" of this area.

It's the minimal gap between the two. I did some reading on the use of DOT-4 vs 3 fluid but there doesn't seem to be enough benefit as far as increased heat potential.

**robnolimit** · 06-10-2011, 04:30 PM

In most cases, 1" of air space is plenty. In severe race conditions, you could sleave the line with some firbraid covering, or wrap the line with some cool-tec exhaust wrap. But, for the most part, I don't think its a big concern. You could hold your hand 1" away from a header tube for quite a while, and brake line and fluid is a lot tougher than skin and blood.

06-10-2011, 01:55 AM	#1
SCOTI Registered User Join Date: Apr 2001 Location: DALLAS,TX Posts: 21,938	Exhaust vs brake-lines I'm starting to determine the routing for the 2.5" exhaust on my 'Recycle' project. As I was trying to visualize where things were going to go, I noticed that it's pretty cramped where the pipe has to drop down under the manifold on the pass side. There's enough room for the pipe between the starter & frame but I noticed it's going to wind up fairly close (approx 1") to the rear brake-line. How close is too close?? __________________ 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.* Last edited by SCOTI; 06-10-2011 at 01:55 AM.

06-10-2011, 01:26 PM	#2
brad_man_72 the boat guy Join Date: Jul 2007 Location: springfield mo Posts: 2,339	Re: Exhaust vs brake-lines I had one that rubbed, I didn't NOTICE any problems but kept a cclose eye on it before I did my engine swap, then I re routed the brake lines and pretty much everything else. __________________ 67, swb, fleet, tach, throttle, 5.3, 4l60e, 3.73's, fuel cell, 5 lug, p.d.b., 4-6 drop. great little truck 66, stevens drag/ski 18' silouette, 350, 2.02 doublehump heads. comp extreme marine 278 cam, vette 7 fin valve covers, old polished edelbrock intake, velvetdrive, casale v-drive, adj cavitation plate. 28, model a rpu project,

06-10-2011, 01:59 PM	#3
SCOTI Registered User Join Date: Apr 2001 Location: DALLAS,TX Posts: 21,938	Re: Exhaust vs brake-lines I'm not worried about any contact as the area of concern is where the exhaust pipe does its 90 deg turn after exiting the center dump of the manifold (roughly 9" from where it's attached to the manifold). The brake-line is secured to the x-member & frame in 3 different places all within 6-10" of this area. It's the minimal gap between the two. I did some reading on the use of DOT-4 vs 3 fluid but there doesn't seem to be enough benefit as far as increased heat potential. __________________ 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.*

06-10-2011, 04:30 PM	#4
robnolimit Senior Member Join Date: Jul 2010 Location: Dandridge, Tn. USA Posts: 2,226	Re: Exhaust vs brake-lines In most cases, 1" of air space is plenty. In severe race conditions, you could sleave the line with some firbraid covering, or wrap the line with some cool-tec exhaust wrap. But, for the most part, I don't think its a big concern. You could hold your hand 1" away from a header tube for quite a while, and brake line and fluid is a lot tougher than skin and blood. __________________ GoodGuys 2012 Pro-Truck Champion 2012 Truckin' Throwdown Champion GoodGuys 2011 National Champion 2011 Truckin' Throwdown Champion GoodGuys 2010 National Champion Proud to put our products up against all others!



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