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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 2017 Posts: 53 'Bolter | | 'Bolter Joined: Mar 2017 Posts: 53 | Well my project is getting close to street-able. Not done but drivable. It's a 49 GMC 1/2 ton with a SBC with long tube headers and 700r4. I'm 2 years in on the frame off build. I want the final exhaust to be relatively quiet. A bit of a low rumble when accelerating is fine but quiet while cruising in the city or on the highway. Any suggestions would be appreciated . I have a 69 Camaro that has the typical muscle car sound at idle , the lopey rumble and quite a bit louder while accelerating. I don't want that for the truck. | | | | | Joined: Mar 2010 Posts: 10,272 Renaissance Man | | Renaissance Man Joined: Mar 2010 Posts: 10,272 | In the muffler business, they call them Cadillac mufflers. Full flow, but whisper quiet while puttering about. You do hear what's going on when you step into it though.
I have them on my '49 3100 with a 350 with just a bit of a cam in it. The muffler shop should know what you are looking for if you tell them "Cadillac mufflers".
1952 5-window - return to "as built" condition | 1950 3100 with a 235 and a T-5 transmission
| | | | | Joined: Dec 2001 Posts: 14,522 Moderator: Welcome Centre, Southern Bolters, Legion Hall | | Moderator: Welcome Centre, Southern Bolters, Legion Hall Joined: Dec 2001 Posts: 14,522 | How about a couple of the real Smitty's. Have two on my hot 350 in my 37. They have "burned out" a little now and sound sweet but not obnoxious at all. | | | | | Joined: Jan 2013 Posts: 2,232 Moderator: Interiors, Texas Bolters, Name that Part | | Moderator: Interiors, Texas Bolters, Name that Part Joined: Jan 2013 Posts: 2,232 | I put a magnaflow 20 on my truck and love the deeper sound. I get many compliments. | | | | | Joined: Feb 2004 Posts: 29,756 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,756 | The muffler Carl is talking about was used OEM on mid-1970's Cadillacs with 472 or 500 cubic inch engines. It has 2 1/2" pipes in and out, and using two of them in an exhaust system for a relatively small engine like a 350 gives virtually no back pressure and a pretty quiet sound. I built up a 318 Dodge engine for my son's pickup several years ago for just the sound you're looking for- - - - -quiet cruising and just a little bit of bark on hard acceleration.
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
| | | | | Joined: Feb 2001 Posts: 4,095 'Bolter | | 'Bolter Joined: Feb 2001 Posts: 4,095 | Go here for sounds.. They test each of their mufflers. I have a 40 0n my 54 235, duals.
Ron, The Computer Greek I love therefore I am.1954 3100 Chevy truckIn the Gallery 2017 Buick Encore See more pix1960 MGA Roadster Sold 7/18/2017
| | | | | Joined: Aug 2012 Posts: 1,214 Shop Shark | | Shop Shark Joined: Aug 2012 Posts: 1,214 | Dual Dynamax's on an SBC 350. 49 GMC with dual Dynamax | | | | | Joined: Jun 2011 Posts: 5,096 Crusing in the Passing Lane | | Crusing in the Passing Lane Joined: Jun 2011 Posts: 5,096 | Stock Dodge 6bt on '37 GMC with DD, quiet yet can hear.
Ed
'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
'55 GMC 370 w/270, 420 4 speed, grain, dump bed truck from ND. Works OK.
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