What mufflers are you running on a big block engine - The 1947 - Present Chevrolet & GMC Truck Message Board Network

7d1truckguy · 11-10-2013, 02:54 PM

Wondering what you guys are running for mufflers on your big blocks I have a 402 with H pipe and 2 1/2 inch exhaust and was thinking about going with a 40's series flowmaster any idea's

Tachout · 11-10-2013, 03:49 PM

Right now I do not have a big block but this is who I would recommend.

http://thecoffinmuffler.com/

I plan on putting these on the small block in my 67. I am also going to be running these on my Blower Motor in my Corvette Coupe, and the Street car Corvette Convertible. These flow better than the flowmaster, have great sound, and are very affordable.

I hope to order and install them on my truck in the next couple weeks. Just waiting on getting the rest of the new exhaust to bet it to exit behind the rear tires.

70 shorty · 11-10-2013, 03:49 PM

I love the sound of a big block through 40 series mufflers, but it would be pretty loud inside!

killerpanel · 11-10-2013, 05:04 PM

40'S no question.

ItsRandy · 11-10-2013, 06:17 PM

I've got 3" DynoMax on my 502. Not terribly loud and sound great.

**Already Gone** · 11-10-2013, 06:21 PM

subscribed

Livrat · 11-10-2013, 08:53 PM

Quote:

Originally Posted by ItsRandy

I've got 3" DynoMax on my 502. Not terribly loud and sound great.

I second the DynoMax mufflers, I originally put on 40 series Flowmasers with 3 inch exhaust and Doug Thorley Tri-Y headers on the 468 in my 68 and to me they were too loud and sounded like burnt out glasspacks.

**kwmech** · 11-10-2013, 09:37 PM

Magnaflow with a 3'' single pipe

ecgate · 11-10-2013, 10:35 PM

Quote:

Originally Posted by Livrat

I second the DynoMax mufflers, I originally put on 40 series Flowmasers with 3 inch exhaust and Doug Thorley Tri-Y headers on the 468 in my 68 and to me they were too loud and sounded like burnt out glasspacks.

What dynomax mufflers are you running?

Livrat · 11-11-2013, 12:18 PM

Quote:

Originally Posted by ecgate

What dynomax mufflers are you running?

I honestly do not remember which ones as they were put on 11 years ago.

NC_John · 11-10-2013, 10:38 PM

Quote:

Originally Posted by Livrat

I second the DynoMax mufflers, I originally put on 40 series Flowmasers with 3 inch exhaust and Doug Thorley Tri-Y headers on the 468 in my 68 and to me they were too loud and sounded like burnt out glasspacks.

I had a pair of dynomax mufflers on an S-10 with a built 355. They sounded fantastic and I'm considering them for my C-10.

muckyp · 11-10-2013, 10:50 PM

I have the stainless magnaflows behind a stockish 454, and I would agree with a previous comment that they pretty quiet.

71K20chevy · 11-10-2013, 06:22 PM

None.

Just kidding, but like the sound of open headers on a big block.

71 super · 11-10-2013, 06:26 PM

Hooker aero chambers! I have 40 series on one big block and flow big block mufflers on another, aero chambers on 383 and love the sound no drone, still sounds "nutty" and runs like a raped ape.

engineer_gregh · 11-10-2013, 07:44 PM

Just put series 40's with 2 and 1/2 inch pipes behind existing long tube headers this past Thursday. I let a muffler shop talk me into stainless magna flow type last year and was not happy with the sound. Just my .02 cents but nothing sounds better than flow master mufflers. I'm also running the same setup on a small block. I'm extremely pleased with both.

engineer_gregh · 11-10-2013, 07:46 PM

Forgot something, mine are not loud inside the cab even at 65 to 70 mph.

vidman · 11-10-2013, 08:15 PM

Spintech Super Pro-Street 9000

Bennett68C10 · 11-13-2013, 09:08 AM

Quote:

Originally Posted by vidman

Spintech Super Pro-Street 9000

This is what I have, sounds awesome

bbcmudtruck · 11-11-2013, 04:02 PM

I'm currently running the flowmaster 40s. They sound great at idle, but they sort of give up the muscle sound when your on the gas. I would like to try the dynomax ultra flow 3" in and out mufflers. I think they the 16" long ones. Heres a 496 with them.

1970 SS 454 Chevelle Dynomax Ultra Flo 17547 ...

**FRENCHBLUE72** · 11-11-2013, 07:55 PM

Black flowmasters 40s I think but would love a set of spin techs or corsas

**HIGHWAY BY THE SEA** · 11-12-2013, 08:50 PM

I just got two free nearly new Flowmaster 42443s in a deal I made. But I have heard that they are LOUD outside and inside the cab! That concerns me because I was going to install these with the new 350 next year and i like to hear my radio while driving.

**davischevy** · 11-12-2013, 11:56 PM

I picked up my 71 Big block GMC from the muffler shop this afternoon. Stock manifolds with Flowmaster 40's 2 1/2" tailpipes out behind the wheels. I love the way it sounds. Not too loud, just throaty.

11-10-2013, 02:54 PM	#1
7d1truckguy Registered User Join Date: Jul 2013 Location: warren oregon Posts: 117	What mufflers are you running on a big block engine Wondering what you guys are running for mufflers on your big blocks I have a 402 with H pipe and 2 1/2 inch exhaust and was thinking about going with a 40's series flowmaster any idea's Attached Images

11-10-2013, 03:49 PM	#2
Tachout Registered User Join Date: Oct 2013 Location: Sandy Utah Posts: 46	Re: What mufflers are you running on a big block engine Right now I do not have a big block but this is who I would recommend. http://thecoffinmuffler.com/ I plan on putting these on the small block in my 67. I am also going to be running these on my Blower Motor in my Corvette Coupe, and the Street car Corvette Convertible. These flow better than the flowmaster, have great sound, and are very affordable. I hope to order and install them on my truck in the next couple weeks. Just waiting on getting the rest of the new exhaust to bet it to exit behind the rear tires.

11-10-2013, 03:49 PM	#3
70 shorty Where's my beer? Join Date: Oct 2004 Location: Glen Allen, VA Posts: 1,768	Re: What mufflers are you running on a big block engine I love the sound of a big block through 40 series mufflers, but it would be pretty loud inside! __________________ 70 C10, shortstep, .30 over 250,Hurst shifted 3 spd parts hauler. Holley 390, Clifford Intake, Header, ported cylinder head, unknown bigger cam. 79 Corvette L82, 4 spd, black, red interior, headers, flowmasters, and unkown bigger cam. '03 Grand Cherokee Laredo, 4.0 4x4 daily driver. 165K miles, and runs great '08 Tahoe LTZ 4x4 155K

11-10-2013, 05:04 PM	#4
killerpanel Registered User Join Date: Oct 2013 Location: Schenectady NY Posts: 79	Re: What mufflers are you running on a big block engine 40'S no question.

11-10-2013, 06:17 PM	#5
ItsRandy Registered User Join Date: Nov 2010 Location: Grand Terrace, Ca. Posts: 1,607	Re: What mufflers are you running on a big block engine I've got 3" DynoMax on my 502. Not terribly loud and sound great. Attached Images

11-10-2013, 06:21 PM	#6
Already Gone 70+ ( Old Skool Club ) Join Date: Nov 2003 Location: Saskatoon, Saskatchewan ,Canada Posts: 9,109	Re: What mufflers are you running on a big block engine subscribed __________________ 1972 C10 Custom/Deluxe 613 Highlander 406/700R4 1999 White Tahoe LS 4x2 with Z56 Police Package 1992 K1500 GMC Suburban Members I have personally met: MusicMan70 - HeavyD - ChewyChevy67 - StingRay -71SWB4x4 - 67 Burb - DeadheadNM - too much stuff - bc65 - das601 " Circumsatances Do Not Change Responsibility " " The Sky is not the Limit, Your Mind is." Marilyn Monroe .. RIP Charlie Watts 1941 - 2021

11-10-2013, 09:37 PM	#8
kwmech Senior Member Join Date: Mar 2003 Location: Colfax-California Posts: 8,499	Re: What mufflers are you running on a big block engine Magnaflow with a 3'' single pipe

11-10-2013, 10:50 PM	#12
muckyp Registered User Join Date: Mar 2001 Location: Forney, Texas Posts: 290	Re: What mufflers are you running on a big block engine I have the stainless magnaflows behind a stockish 454, and I would agree with a previous comment that they pretty quiet. __________________ 70 SWB 454/TH400

11-10-2013, 06:22 PM	#13
71K20chevy Registered User Join Date: Jul 2012 Location: Ft Wayne Indiana Posts: 1,204	Re: What mufflers are you running on a big block engine None. Just kidding, but like the sound of open headers on a big block. __________________ 71 K20 64 GMC mud truck

11-10-2013, 06:26 PM	#14
71 super Registered User Join Date: Sep 2005 Location: Canton North carolina Posts: 3,079	Re: What mufflers are you running on a big block engine Hooker aero chambers! I have 40 series on one big block and flow big block mufflers on another, aero chambers on 383 and love the sound no drone, still sounds "nutty" and runs like a raped ape. __________________ 67 blue step side- bb 68 gold and white swb cst anniversary 68 custom swb hot rod Ls swap 69 swb cst 6 cylinder/ overdrive 69 black/black cst bb swb 70 orange and white cst Canada built truck swb bb 71 black and white super swb bb 71 red and white super swb 72 green and white super swb 4x4 62 nova wagon 400 series Ls swapped 68 Camaro 327/4 speed- 1 owner, original paint 66 Volkswagen bettle 69 auto stick Volkswagen Beetle

11-10-2013, 07:44 PM	#15
engineer_gregh Registered User Join Date: Feb 2012 Location: Smyrna TN Posts: 1,153	Re: What mufflers are you running on a big block engine Just put series 40's with 2 and 1/2 inch pipes behind existing long tube headers this past Thursday. I let a muffler shop talk me into stainless magna flow type last year and was not happy with the sound. Just my .02 cents but nothing sounds better than flow master mufflers. I'm also running the same setup on a small block. I'm extremely pleased with both.

11-10-2013, 07:46 PM	#16
engineer_gregh Registered User Join Date: Feb 2012 Location: Smyrna TN Posts: 1,153	Re: What mufflers are you running on a big block engine Forgot something, mine are not loud inside the cab even at 65 to 70 mph.

11-10-2013, 08:15 PM	#17
vidman Registered User Join Date: Jun 2012 Location: Fitchburg,Mass Posts: 737	Re: What mufflers are you running on a big block engine Spintech Super Pro-Street 9000 __________________ 62 Willys 4wd Pickup : 72 C-10 swb 504 stroker 09 Taco 3" lift 33" tires: 90 K-5 blazer (plow truck): RIP Ross Little brother

11-11-2013, 07:55 PM	#20
FRENCHBLUE72 PROJECT 7DEUCE Join Date: Dec 2002 Location: GRANTS PASS OR Posts: 21,601	Re: What mufflers are you running on a big block engine Black flowmasters 40s I think but would love a set of spin techs or corsas __________________ GO BIG GREEN GO DUCKS MEMBER #6377 72 k-5 daily driver 6'' lift 35'' 350-350-205 slowly getting rust free. Project "7DEUCE" check out my build http://67-72chevytrucks.com/vboard/s...d.php?t=267665 Tim Powell..R.I.P EastSideLowlife..... R.I.P..

11-12-2013, 08:50 PM	#21
HIGHWAY BY THE SEA Registered User Join Date: Nov 2012 Location: BY THE CAROLINA SEA Posts: 919	Re: What mufflers are you running on a big block engine I just got two free nearly new Flowmaster 42443s in a deal I made. But I have heard that they are LOUD outside and inside the cab! That concerns me because I was going to install these with the new 350 next year and i like to hear my radio while driving. __________________ FRANKENTRUCK 1981 Chevrolet C10 Shortbed Stepside GRANDTRUCK 1968 Chevrolet C10 Stepside Longbed http://67-72chevytrucks.com/vboard/s...d.php?t=584617 PROJECT JIGSAW 1967 GMC C3500 GREAT WHITE 1986 Blazer M1009



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11-12-2013, 11:56 PM	#22
davischevy Senior Member Join Date: Sep 2008 Location: Harrison, Arkansas Posts: 9,814	Re: What mufflers are you running on a big block engine I picked up my 71 Big block GMC from the muffler shop this afternoon. Stock manifolds with Flowmaster 40's 2 1/2" tailpipes out behind the wheels. I love the way it sounds. Not too loud, just throaty.

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