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Labor Day Putting down your wrenches or time for
MORE wrenching? 
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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Mar 2005 Posts: 94 'Bolter | | 'Bolter Joined: Mar 2005 Posts: 94 | I recently replaced a bad muffler on my 53 (1960 235) with an 18" glasspack. Has anyone experienced any flow issues with these? Mine sounds horrible at idle, almost like its missing..just a rough idle. No obvious leaks in the pipe, I welded everything, and the engine sounds smooth when your standing over it. I even went as far as to replace the plugs and wires, swaped out the carb. same issue.
plenty of fuel to the carb too.
Chris
1953 Chevrolet 3100
| | | | | Joined: Feb 2000 Posts: 5,190 'Bolter | | 'Bolter Joined: Feb 2000 Posts: 5,190 | Most likely it was tuned with a bad muffler, now that it has free flow you might mess with the idle adjustment a little. In is lean, out is rich, go 1/2 turn each way and see what it sounds like. Idle screw will not fix anything above a idle, if its not running right out on road, then you have other problems.
Joe | | | | | Joined: Jun 2010 Posts: 188 Shop Shark | | Shop Shark Joined: Jun 2010 Posts: 188 | Seems to be the sound waves are different that are created by the 6 compared to a v8 that is normally used with a glasspack.
Read about this in the info for my Langdon's headers on my 250. Sorry I Lost the info of course.
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