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1964 El Camino
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305 Posts
Discussion Starter #1
I have a carbureted crate sbc 350 engine LM1, stock exhaust manifolds and just bought Edelbrock e-street heads and comp cam CL 12-246-3 with new lifters, pushrods and stamped steel roller tip rocker arms that I haven鈥檛 installed yet.
Besides starting over and making it electric 馃ぎ, how do I make this purr as quietly as possible?
Flowmaster, resonators, dynomax? Any advice on headers?
 

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jelco, all new pipe, no salvage yard stuff. Walker/Dyno used to make a "hemi" muffler with more baffling in it, which is quieter than the "turbo" series., now known as DynoMax. Frankly, if you use non-performance type mufflers it would be quiet.
 

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I'm running a set of Magnaflow mufflers with an H pipe from a set of Hooker Blackheart headers. It could be a little louder for me but what I'm most happy about is no annoying droning sounds at any speed.

I think this is mostly because the shop welded in very good rubber isolation hangers to prevent droning. And did it at the proper locations to break up the resonance that causes droning.

Rick

Sent from my SM-G965U using Tapatalk
 

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1970 chevelle Malibu
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461 Posts
Thrush turbo mufflers were quiet on my 350 with summit headers and an xpipe . H pipe should make it a little quieter too. My boss has a 69 Camaro with a built 350 with cheap headers, h pipe and the quietest flow master mufflers. All 2.5鈥 and it鈥檚 super quiet!
 

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THX hess, I mucked up manufacturers. Believe the turbos are baffled to be oem quiet.
 

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1964 El Camino
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305 Posts
Discussion Starter #11

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1970 chevelle Malibu
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461 Posts
If you want quiet don鈥檛 do what I did now. Dougs headers, x pipe with pypes violator mufflers. Stupid loud! I might have to change it up.
 

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From Australia to the USA.
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summit headers (half the price and fit really well for me) magna flow 2.5 everytime it the recommendation
 

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Summit racing Turbo mufflers did well in horsepower dyno shoot out many years ago. They are fairly quiet. A friend has them on a 64 GTO and I think they sound great and are quieter than most performance mufflers.

 

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I have the 2.5" Pypes with xpipe and Race Pro mufflers out the back. Has a nice muscle car rumble at idle and not stupid loud under acceleration no drone either
 

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Dynomax Super Turbo #17749.. Its one of the best flowing mufflers out there. It also has a real nice smooth tone. Its not offensive but you can tell there's something good under the hood..
 

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I used Hooker Turbo Comps with a H pipe on my 69 Camaro. Nice sound, could come to life under full throttle. H pipe is much quieter then a X pipe.
 

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To be quiet with SBC try shorty headers and stock exhaust system or something very close to stock. Shorty headers help with starter clearance and might fit better then other choices. A BBC was never very quiet in stock form, however a slightly longer muffler would help. The limit is how long can you use or how long is the longest that you can fit.
 

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Jelco- Are you looking for just mufflers? Hydro462 was right, 20" Dynomax Super Turbo's #17749 will quiet your car while still sounding like a muscle car. Most chambered mufflers are on the loud side, and drone. Flowmaster makes a couple of quieter versions- Super 50 & 70 Series, and they control drone nicely. Straight through mufflers have a high tendency to drone, but Magnaflow seems to be the exception to this. And it goes without saying that the longer the the muffler, the quieter.
Drone is rpm specific- usually between 1800-2400 rpm. If your final drive ratio is around 2:56- 3:08, your cruise rpm will be in that range so once again, a turbo style muffler will help.
If you need a complete system, an X-Pipe will quiet it down. But be aware that it will also change the tone. It will sound smoother and more modern. Some like it, some don't. An X is usually good for top end HP without affecting bottom end.
An H-Pipe will quiet it down slightly without affecting tone, and help with bottom end without affecting top end.
There's some good info and sound clips here to help you with your decision- Exhaust 101
 
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