Frame and Exhaust - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Raven Lunatic · 10-23-2003, 04:17 PM

Hey lads and lasses,

I've seen a thread related to this before, but can't find it now... I'd like to get anyone's input on cutting holes in the frame crossmember to put exhaust through rather than under the frame... I am just months away (!) from sandblasting and powdercoating the frame and want to have this done first...

How big should the holes be? What is the best way to strengthen the frame afterward?

Thanx in advance...

polevault1977 · 10-23-2003, 09:03 PM

I put 4.5 collar in the trailing arm crossmember and a 3.5 collar in the panhard bar crossmember. I haven't got to run my exhaust yet, so I can't give you any detail on how it is going to work out. I'm not far away though. I tried to set it up for oval-off set-off-set mufflers. Pretty crowded where it going through the rear crossmember and the gastank. Still kicking around the idea of solid mounts with stainless steel flex hose after the headers. Hope the pic helps, Danny

polevault1977 · 10-23-2003, 09:05 PM

Solid mounts, if I use them

Litdave · 10-25-2003, 01:08 AM

Last year somebody had some very good frame only (no bed or cab) pictures of frame with the exhaust routed through the crossmember on a truck he/she was restoring. I have searched for these pictures but have not been able to find them.

If anybody has a link to the pictures I sure would like to see them again.

Thanks, Litdave

Raven Lunatic · 10-25-2003, 07:00 PM

Thanx PV, that was exactly what I was looking for...

10-23-2003, 04:17 PM	#1
Raven Lunatic On the Hillbilly Highway Join Date: Nov 2002 Location: Edmonton, Alberta Posts: 90	Frame and Exhaust Hey lads and lasses, I've seen a thread related to this before, but can't find it now... I'd like to get anyone's input on cutting holes in the frame crossmember to put exhaust through rather than under the frame... I am just months away (!) from sandblasting and powdercoating the frame and want to have this done first... How big should the holes be? What is the best way to strengthen the frame afterward? Thanx in advance...

10-23-2003, 09:03 PM	#2
polevault1977 Pick'n up the pieces! Join Date: Sep 2002 Location: Marietta, Oklahoma Posts: 198	I put 4.5 collar in the trailing arm crossmember and a 3.5 collar in the panhard bar crossmember. I haven't got to run my exhaust yet, so I can't give you any detail on how it is going to work out. I'm not far away though. I tried to set it up for oval-off set-off-set mufflers. Pretty crowded where it going through the rear crossmember and the gastank. Still kicking around the idea of solid mounts with stainless steel flex hose after the headers. Hope the pic helps, Danny Attached Images

10-23-2003, 09:05 PM	#3
polevault1977 Pick'n up the pieces! Join Date: Sep 2002 Location: Marietta, Oklahoma Posts: 198	Solid mounts, if I use them Attached Images

10-25-2003, 01:08 AM	#4
Litdave Registered User Join Date: Feb 2002 Location: Tullahoma, TN Posts: 202	Last year somebody had some very good frame only (no bed or cab) pictures of frame with the exhaust routed through the crossmember on a truck he/she was restoring. I have searched for these pictures but have not been able to find them. If anybody has a link to the pictures I sure would like to see them again. Thanks, Litdave __________________ 71 Factory SWB 4x4 Project 383/350/205 69 LWB 2wd CST Daily Driver ZZ4/700r4/3.73 72 SWB Future Hot Rod

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10-25-2003, 07:00 PM	#5
Raven Lunatic On the Hillbilly Highway Join Date: Nov 2002 Location: Edmonton, Alberta Posts: 90	Thanx PV, that was exactly what I was looking for...



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