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Old 03-17-2008, 02:51 PM
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65 chevy P/U exhaust questions

65 Chevy SWB, this model has the track bar from the rear axle to the drivers side frame. i am using 3" tail pipe, since the axle moves up and narrows the space above the axle and i plan to drop it 3", wondering can the exhaust pipe be ran on the outside of the frame ?

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Old 03-17-2008, 04:11 PM
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yes, out side the frame is a good way of doing it.

I have a 4/6 drop on my truck. most trucks that age already have a 2" drop due to spring sag. call classic enterprises, they have a pretty good drop kit and they know where to measure and what the stock ride height is, so you will know if you have a drop already in the truck.

I have done a lot of different exhaust systems on my truck (70 chevy). In one version, I made sharp 90's at the exhaust manifolds to get outside the frame rails at the front of the frame (behind the tires of course) then ran the pipes all the way out the back, over the axles, between the tires and the frame. The only issue with this route is that is no place for an H-pipe and the rear tires need to come off when pulling out the exhaust.

I have also ran headers, then a H-pipe, then made sharp 90's to get out of the frame rails before the rear cross member. this worked fine also and only hit the pipes one time on a very extreme drop off.

FYI, classic enterprises also makes a rear cross member than has holes for exhaust pipes so the pipes can stay in the frame.

And, if you use flex connectors up front then the rear pipe section can be solid mounted to the frame to gain more clearance.
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Old 03-18-2008, 07:08 AM
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I have the exhaust running on the outside of the frame - basically there is a pipe off the header that runs under the frame and bends 90 deg to meet the mufflers under the cab on each side... From there it runs pretty much straight back. The shop did square off 1 side of the pipe that passes by the axle bumper mount that sticks out on each side. I have an old pic of just teh chassis, exhaust and drivetrain in the truck if you are interested in seeing how mine is set up.
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