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01-16-2004, 11:45 AM
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#1 |
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Registered User
Join Date: Oct 2003
Location: Cumming, Ga
Posts: 234
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Glasspacks or flowmasters?
Glasspacks or flowmasters?
Any thoughts? Wanting to hook one or the other up to my stock cast iron manifolds. 68 lwb sbc307
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Glenn Cumming, Ga (68 C/10 Fleetside LWB 307 (64 C/10 Fleetside Shorty Custom 350, with 73 donor parts aplenty) (2001 Porsche Boxster S - 168 MPH of fun) (2005 Chevy Avalanche Z71 1500) |
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01-16-2004, 11:50 AM
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#2 |
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Registered User
Join Date: Sep 2002
Location: Kentucky
Posts: 107
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Flowmaster's (2 chamber)
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01-16-2004, 12:22 PM
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#3 |
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Robert Olson Transport
 
Join Date: Oct 2002
Location: recent transplant to NC USA
Posts: 20,310
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ive never used glasspacks but i have flowmasters and never had any problem
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Bob 1951 International running on a squarebody chassis "If a man's worth is judged by the people he associates himself with, then i am the richest man in the world knowing some of the fine people of this board" http://67-72chevytrucks.com/vboard/a...t.php?f=25&a=9 (you can review the site rules here!) PM Me for your vehicle/parts hauling needs in the North East US or see my Facebook page Robert Olson Transport Live each day to the fullest.. you never know when fate is going to pull the rug out from under you... I hate cancer!! |
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01-16-2004, 12:37 PM
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#4 |
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Howzit?!?
Join Date: Jan 2003
Location: Maryville, TN
Posts: 1,265
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I've got Flowmasters runnin' thru stock manifolds off my 307... I like 'em a lot!
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Jason Hawaiian-J 70 Longbed, 307, Edelbrock Carb 1404, Edelbrock Intake 2101, Dual Roller Timing chain and gears, 214/214 cam, Comp Roller Rockers, dual Flowmasters. 1999 Chevy Tahoe 2004 Mini Cooper S 71 BMW 2002 - Sold |
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01-16-2004, 12:54 PM
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#5 |
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Registered User
Join Date: Sep 2003
Location: Franconia,N.H.
Posts: 1,029
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Flowmasters for sure
 I've heard what they sound like on a 350 with headers so I would think they would sound somewhat the same  I know I like em' because I've sceemed up a plan to put on a set from that truck but I have to cut em' down to size cause they were off a longbed and I got a shortIMO defidently FLOWMASTERS
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(Only) Member of the CPNE Fan Club  Aint that the truth 67 C-10 350 with 3-speed tranny and 308 gears swb step  82 Z28 Camaro 355 small block over 350 hp and a borg warner super t-10 (blown engine) 72 Chevy K20 Suburban (future project) 70 Chevy K20 now 68 GMC K2500 2003 Chevy 2500hd ccsb 4X4 (daily driver) |
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01-16-2004, 01:01 PM
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#6 |
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Hoarding Rusty Objects
Join Date: Aug 2002
Location: Slatington, PA
Posts: 267
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Neither; get dynomax ultraflows.
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1985 Chevrolet K20 Silverado 1994 GMC Yukon Follow me on Youtube! - http://www.youtube.com/user/FuelInjectionSucks |
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01-16-2004, 01:32 PM
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#7 |
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Young One
Join Date: Oct 2003
Location: La Porte Indiana
Posts: 138
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Flowmasters the only way to go, American Thunder 40's series.
Glass packs have the fake (Loud) power sound.
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69 R/S Camaro 79 K5 86 M1008 11 P71 Vic 12 Ram 3500 18 Ram 2500 |
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01-16-2004, 01:38 PM
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#8 |
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Don't say "Oops!", Doctor
Join Date: Nov 2003
Location: Houston, TX
Posts: 677
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Pick up a set of Flowtec Afterburners. Take the money you'll save and buy a beer for all those guys that will realize they could've had a truck that doesn't sound like everyone else's. If you couldn't tell, I like mine.
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'Mutt 1968 CST LWB: R.I.P. 1967 Chevelle: TPI 454 beast 1967 C10 SWB: Claimed when Bumpster didn't put it on his list |
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01-16-2004, 01:41 PM
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#9 |
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user # 2756
 
Join Date: Jun 2001
Location: Chesapeake, Virginia
Posts: 4,612
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I have summit "welded" mufflers which are chambered mufflers like the flowmasters and cheaper.
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1970 K25, 8' stepside bed 350/465/205 44 up front, 60 in the rear 4.10s rolling on 33" Dunlop MTs 1986 K5, 350/465/208 Dana 60/14 bolt from a cucv 36" Super Swampers TSL/SX 1983 K20 w/ CUCV axles, 350/700R4/208 sitting on 37" Goodyears 1986 M1031 6.2 diesel, TH400/NP205 locker in the rear and a LS in the front, all stock for now..... 1986 K30, 350/400/205 dana 60 and 14 bolt. I kept the drivetrain. Body/bad and chassis are gone. 1981 K30, 350/465/205 dana 60 and dually 14 bolt. Has a G80, and a flat bed. Going to replace the flat bed. 1985 K20, 350/400/208 10 bolt and SF 14 bolt. I wonder where I can find some 1 tons. Hmmmmm 
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01-16-2004, 02:01 PM
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#10 |
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Registered User
Join Date: Dec 2003
Location: San Leandro, CA
Posts: 83
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Also Consider Outlet Tips, "Megaphone Effect"
My 72 C20 had glasspacks when I got it. I thought it sounded pretty good. Then I put on a new exhaust system with 2 chamber flowmasters (40 series). It sounds much better with the flowmasters than it did with the glasspacks.
One of the big differences in sound I have learned about is the size of megaphones if they are used. The exhaust shop explained this. We all know how a voice megaphone amplifies sound. I put on tips that are larger than the rear pipe when I put the flowmasters on the C20 truck. They work like voice megaphones and the sound waves are allowed to expand as they go from the tailpipe into the larger diameter magaphone tip before they leave the vehicle. Exhaust sound is louder than with same diameter exit tips. My recent K20 has the same flowmaster 40s as the C20 but with smaller outlet tips. There is a difference in how they sound. The K20 is a little quiter than the C20, even with the same pipes and mufflers. If you want louder, you can use tips that are a little or much larger than the tailpipe diameter and get more sound. Or just keep the tips the same size as the pipe and the sound will not amplify beyond what is governed by the muffler and pipe choices. I'm not trying to be a scientist, or positive that what I observe is the only truth, but what the muffler guys told me agrees with what I hear and how I know voice megaphones work.
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72 C20 3/4 Custom Camper 94 Roadmaster Estate Wagon |
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01-16-2004, 02:02 PM
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#11 |
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Registered User
Join Date: Nov 2002
Location: Spokane WA
Posts: 66
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i have glasspacks they are noisy but kinda nice if ya wanna bug the soccer mom in the minivan next to you as shes yackin on her cell phone and puttin on her make-up instead of paying attention to the road
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67 C/20 camper special 350 |
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01-16-2004, 02:39 PM
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#12 |
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Registered User
Join Date: Oct 2003
Location: Cumming, Ga
Posts: 234
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What size of inlet and outlet did the 68 Chevy 307 come with? I assume I want the inlet to go over the pipe and then c clamp it on.
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Glenn Cumming, Ga (68 C/10 Fleetside LWB 307 (64 C/10 Fleetside Shorty Custom 350, with 73 donor parts aplenty) (2001 Porsche Boxster S - 168 MPH of fun) (2005 Chevy Avalanche Z71 1500) |
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01-16-2004, 02:54 PM
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#13 |
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Don't say "Oops!", Doctor
Join Date: Nov 2003
Location: Houston, TX
Posts: 677
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I believe the factory small blocks used 2-inch, didn't they?
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'Mutt 1968 CST LWB: R.I.P. 1967 Chevelle: TPI 454 beast 1967 C10 SWB: Claimed when Bumpster didn't put it on his list |
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01-16-2004, 03:06 PM
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#14 |
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Registered User
Join Date: Sep 2003
Location: Franconia,N.H.
Posts: 1,029
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Yeah all the small-blocks are 2 in. stock size
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(Only) Member of the CPNE Fan Club Aint that the truth67 C-10 350 with 3-speed tranny and 308 gears swb step 82 Z28 Camaro 355 small block over 350 hp and a borg warner super t-10 (blown engine) 72 Chevy K20 Suburban (future project) 70 Chevy K20 now 68 GMC K2500 2003 Chevy 2500hd ccsb 4X4 (daily driver) |
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01-16-2004, 03:38 PM
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#15 |
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Senior Member
Join Date: Jan 2003
Location: daytonabeach
Posts: 22,956
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i bought bargin turbo mufflers at a local auto parts for about $20 each i've got better things to do with my money than to try and impress people with overpriced mufflers
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71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY |
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01-16-2004, 03:46 PM
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#16 |
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Registered User
Join Date: Jan 2000
Location: Wyoming USA
Posts: 2,449
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Yeah what cdowns said
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2001 Silverado K-1500 2005 FXDWG stage3 69 CHEVY Short/Step 327/4L60 373 posi 63 IMPALA 327 |
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01-16-2004, 03:54 PM
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#17 |
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Formerly yellow72custom
Join Date: May 2001
Location: Austin, TX
Posts: 7,531
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Defenitly flows!
I have had both and i like the Flows 10x better! 
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'72 Chevy C10 Mild 350/TH350/3.07. Ochre/White. Old high school ride. '70 GMC C2500 '62 327 4bbl/SM465/4.56-geared Dana 60. White/White. Project or parts truck. '97 Saturn SL DD. 1.9/5-speed. 40+ highway mpg |
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01-16-2004, 05:01 PM
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#18 |
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Try spinnin 4 rear tars
Join Date: Sep 2003
Location: Salt Lake City, Utah
Posts: 757
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Flowmasters!!!
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SWEET7T 1970 C10, 2wd, LB, 307/TH350/3.08. PS, PB |
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01-16-2004, 06:54 PM
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#19 |
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Progress = 0%
Join Date: Nov 2001
Location: Kansas City, MO
Posts: 2,108
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Neither. Dynomax.
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Jason - '67 GMC swb | '57 Bel-Air 4dr hardtop | '56 210 4dr Wagon | 2000 GMC Sierra |
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01-16-2004, 07:31 PM
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#20 | |
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I love doing it topless
Join Date: Oct 2003
Location: MossyRock, WA
Posts: 493
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Whoa...slow down there
Quote:
I am not trying to sound like an a$$ but i went through this with my wife when it came to my 71' LB. sorry if i have come off that way. as you can tell, i think the flows are best performance wise.
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Mikey "If you can read this, thank a teacher; If you are reading it in English, thank a soldier." 
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01-16-2004, 07:36 PM
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#21 |
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Registered User
Join Date: Oct 2003
Location: Yuma, Az
Posts: 477
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I have glass packs with 2 1/2" pipe and they are pretty loud. I like it but I'm not so sure how legal they are. One thing for sure is the soccer moms don't like 'em.
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Martin Gibson
USAF Retired 1964(-ish) C10 |
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01-16-2004, 08:29 PM
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#22 |
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Account Suspended
Join Date: Mar 2003
Location: ** THE FALL GUY **CHICAGO IL
Posts: 5,883
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HOOKER AREO CHAMBERS
HOOKER AREO CHAMBERS HOOKER AREO CHAMBERS
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01-16-2004, 08:35 PM
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#23 |
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Senior Member
Join Date: Nov 2003
Location: Brookings, SD
Posts: 10,497
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Flowmaster - had them on my last 2 trucks - great mufflers.
Shawn
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Some people are like slinkies, they aren't good for anything, but you can't help but smile when you see one tumble down the stairs. |
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01-16-2004, 09:11 PM
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#24 |
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Registered User
Join Date: May 2003
Location: Phoenix, AZ
Posts: 104
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Dynaflow will out flow anything you can find, FlowMasters have a reputation for the welds coming loose and choking the exhaust. Glass Packs do not flow very well at all and are probably the worst decision you could make.
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01-16-2004, 09:16 PM
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#25 |
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Account Suspended
Join Date: Dec 2003
Location: Texas
Posts: 2,686
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I just got two new flowmasters delivered for 91.98 here is the link where i got mine he has them in most inlet outlet configuration and sizes.
If this auction isnt the size and conifg your lookin for he has links for the other styles of two chamber flows http://cgi.ebay.com/ebaymotors/ws/eB...tem=2454453908 |
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