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#1 |
Hot Rods For Life
Join Date: Sep 2001
Location: Waxahachie, TX
Posts: 3,305
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Anyone running dual 40 series Flowmasters on a 350
On their truck? I am getting ready to install my motor and I want to lose the glasspack setup I have. What inlet/outlet size do I need?
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#2 |
Registered User
Join Date: Oct 2005
Location: Northeast Texas
Posts: 18
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Re: Anyone running dual 40 series Flowmasters on a 350
3" in/out would be good. You may want offset inlets depending on how you mount them.
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70 C10 Stepside, '68 Front clip. No motor/tranny. 69 Firebird LS1/6spd project(sold ![]() 01 Trans Am WS6,red/black,A4, 17x9.5 L.G. Motorsports G2 wheels 275s/315s, DirectFlow lid,QTP cutout. |
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#3 |
Registered User
Join Date: Aug 2003
Location: Bonner Springs, KS
Posts: 307
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Re: Anyone running dual 40 series Flowmasters on a 350
I am running a 350, with 40-Series Flowmasters. 2.5" in/out. with an "H-Pipe". If you have a coil-spring truck, the 2.5" pipe is too big to run out the back. Unless you run it out one side (due to the Panhard Bar). I had mine stop right in front of the rear-end. Turned the bed into a big speaker. TOO LOUD! I'm going to change it to run out one side to reduce the noise in the cab. Someday.
Good Luck! T
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1972 Cheyenne (awaiting 2nd Restoration) 1996 Tahoe (Wife's Car) 1968 Volkswagen Beetle (My Daily Driver) 2004 Silverado SS (Can't afford to drive the dang thing with gas at $ 3.00) |
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#4 |
67-72 Addict!
Join Date: Feb 2002
Location: The TAX State!
Posts: 7,857
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Re: Anyone running dual 40 series Flowmasters on a 350
Inlet/outlet depends on what pipe size you will be using.
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Jim 1970 C/10 Fleetside w/Ghost Flames Lowered 4.5" front and 4" rear (Raked) 355/350 Turbo w/shift kit 10" Redneck Performance Verter w/2500 stall Hooker Super Comps part#2808-1 Performer RPM Air-Gap 12 Bolt w/3:73 gears- Eaton Posi Comp Cams XE262 with 1.6 Crane Energizers, Road Demon 625 and Brodix IK 180 heads |
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#5 |
LAIDOUT
Join Date: Jan 2005
Location: NW Montana
Posts: 928
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Re: Anyone running dual 40 series Flowmasters on a 350
I ran two Flowie 40s on my 71 Cheyenne LWB, 2.25" pipe. My exhaust ran out behind the rear tires, no problem even with the 3/5 drop. I like the sound of that setup, not too loud at idle, really nice at 4k!
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#6 |
Registered User
Join Date: Jan 2001
Location: Meridian, Ms.
Posts: 244
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Re: Anyone running dual 40 series Flowmasters on a 350
I just had my exhaust put on my truck last weekend (350 sbc w/small cam). I ran 2.5" pipe from the headers to the mufllers (Dynomax Hemi's). had to use us 2 1/4" to go over the axle and and then ran them to the rear corners of the bumper. my entire exhaust is tucked up in between the frame rails.
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70 C/10 SWB Go ahead chance it........Columbus did!!! Steve (Chitlin) Bacon My DIY Shop http://s24.photobucket.com/albums/c47/mpalmiter/shop/ |
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#7 |
Hot Rods For Life
Join Date: Sep 2001
Location: Waxahachie, TX
Posts: 3,305
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Re: Anyone running dual 40 series Flowmasters on a 350
I plan on having them dump over the rear axle. Will that work?
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#8 |
Registered User
Join Date: Feb 2005
Location: Carl Junction, Missouri
Posts: 2,061
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Re: Anyone running dual 40 series Flowmasters on a 350
i have 2 1/2 in, 2 1/4 out. i then reduced the outlet to 2 inch because that's the size of the extra pipe i have around here.
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#9 |
Registered User
Join Date: Nov 2000
Location: Huntsville Ontario Canada
Posts: 4,052
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Re: Anyone running dual 40 series Flowmasters on a 350
For you own good. Do not dump it under the box. Get it outside of the body out back infront of the wheels. Unless you like not being able to hear yourself think then dump it under the body.
I have 3" dual Super 40's. It was dumped under the box and with the windows down it way loud but oky. Once it got cooler it drove me nuts with the windows up. I ran the exhaust out in front of the wheels and it not only sounded way better but I could cruize with the windows up and hear my radio.
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1968 Suburban numbers matching all original truck now equipped with 6.0/4L80 on Accuair http://67-72chevytrucks.com/vboard/s...d.php?t=625017 1967 C/20 6.0/4L80 Roofing Truck 1990 V2500 Suburban "Plow Truck" 2005 TAHOE DD |
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#10 |
Registered User
Join Date: Jan 2004
Location: NH
Posts: 2,266
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Re: Anyone running dual 40 series Flowmasters on a 350
Unless you are running a hypo engine the 3" exhuast is a bit much as well as loud. I would go 2.5 and some type of H or X pipe. Mostly it is going to be how load you want it and if you cant stand the noise. You can go up to thir sight and click on their mufflers for sound comparisons.
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1967 C10 - SWBSS Pro Street 427sbc, 700R4 & 4.10 Gears 1948 Chevy FleetMaster Coupe, LS1, (almost done) 1950 Chevy StyleLine Coupe 250/6 3x2 Dueces 2009 Toyota Tundra 1996 Harley RoadKing "I maybe getting old, but I can still burn rubber with the best of them" |
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#11 |
Registered User
![]() Join Date: Dec 2004
Location: Gypsum Kansas 67448
Posts: 1,681
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Re: Anyone running dual 40 series Flowmasters on a 350
i have dual hexhaust w/ headers and mine dump out the bottom right before the axle,it is 3 in 3 out,and they sound awesome,not too loud,but i also have spray-in bedliner all under my truck and in my truck,i dig it,and it is even tucked up in the frame rail so you dont see anything from the side,kinda a b1tch w/ that dang transfer case.mike
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21 2500hd duramax 58 apache HILLJOB GRAPHIX--for all your graphic needs My build thread http://67-72chevytrucks.com/vboard/s...d.php?t=542497 LS ENGINE SWAP INFORMATION THREAD http://67-72chevytrucks.com/vboard/s...d.php?t=377348 4l60 to an NP205 http://67-72chevytrucks.com/vboard/s...43#post3697343 |
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#12 |
Blank
Join Date: May 2005
Location: Southington, CT
Posts: 221
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Re: Anyone running dual 40 series Flowmasters on a 350
I've found that most of the cars and trucks that I put flowmasters on tend to make alot of noise at the muffler not all at the tailpipe getting the mufflers farther back seems to work better as far as interior sound.
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![]() 1969 lwb 4/6 drop 17x8-18x10 torque thrust II's 327-420hp 2004R 3.73 posi. 1977 Corvette 350-375hp 4speed, silver show car. 2002 S10 xtreme, work truck 2004.5 VW jetta GLI 1.8T 6speed, weekend warrior. 2013 Audi A3 TDI, the wife's car |
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#13 |
Hot Rods For Life
Join Date: Sep 2001
Location: Waxahachie, TX
Posts: 3,305
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Re: Anyone running dual 40 series Flowmasters on a 350
Well I am not to concerned about noise right now. I have no radio. I sort of want it a little obnoxious. Sooner or later I will quiet it down a bit.
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#14 |
Senior Member
Join Date: Apr 2000
Location: Delta,Pa
Posts: 14,950
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Re: Anyone running dual 40 series Flowmasters on a 350
im running 2.5 in and out dumping at at angle in front of the rears. the mufflers sit right about at the edge of the cab on the back and have a 45 degree elbow with about 2 ft of pipe on the end of that. sounds really good. much quieter than when i had them dumped behind the cab.it will surely still wake people up when i pass em on the highway
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Owner of North Point Car Care in Dundalk Md. We specialize in custom exhaust on both modern and classic vehicles. We are a full service auto shop from classics to modern vehicles. Feel free to contact me with questions. I will give a 10% discount to any board member. |
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#15 |
Hot Rods For Life
Join Date: Sep 2001
Location: Waxahachie, TX
Posts: 3,305
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Re: Anyone running dual 40 series Flowmasters on a 350
Thanks guys. I went with some mufflers from Summit. I am on a budget so those worked out great from me.
Last edited by Zumo; 01-10-2006 at 03:16 PM. |
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