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#1 |
Registered User
Join Date: Jul 2001
Location: reno, nv
Posts: 646
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glasspacks.....
is anyone runnin' glasspacks, what size? do you like 'em? too loud? good/bad and ugly? any pics? i need to replace the mufflers, blown out at the seams, so i'm lookin' for an inexpensive solution since gas is getting expensive i don't drive it that much. thanks.
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70 LWB, 350/350 A/C, P/S, 3 Tone Paint (white cap, primer gray with black guide coat) |
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#2 |
Insert Title Here
Join Date: Feb 2006
Location: Dyer, Indiana
Posts: 5,679
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Re: glasspacks.....
I have them and I hate them.... they sound like an old tractor..... ill be putting flowmasters on it soon
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BOBBY _69 SWB_ 1000 pics of 67-72's>> http://s193.photobucket.com/albums/z...-72/?start=all << |
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#3 |
member #16
![]() Join Date: Dec 1999
Location: Yuba City Ca.
Posts: 3,618
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Re: glasspacks.....
Turbo's are another cheap solution. I think they are mellower than glasspacks.
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john http://67-72chevytrucks.com/vboard/showgroups.php board vendors ![]() http://www.flickr.com/photos/1745471...7602865984234/ |
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#4 |
Registered User
Join Date: Nov 2000
Location: Huntsville Ontario Canada
Posts: 4,052
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Re: glasspacks.....
I have the cherry bombs on my 84. I dont mine them at all. Kinda nice mellow tone.
The 67 has flows and they are a mufffler that if the truck is driven daily would mabye get to you.
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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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#5 |
Registered User
Join Date: Jul 2001
Location: reno, nv
Posts: 646
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Re: glasspacks.....
thanks for the input, does anyone have pics? i will try and get a pic posted of what i want to replace....thanks.
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70 LWB, 350/350 A/C, P/S, 3 Tone Paint (white cap, primer gray with black guide coat) |
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#6 |
20' Daredevil (Ret)
![]() Join Date: May 2003
Location: Jefferson State
Posts: 13,643
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Re: glasspacks.....
I have 30" blanks, can't recall which mfr but it's the company that bought out Mitchell (many years ago). They had a nice deep, mellow rumble without being loud at all. After many years, they are getting a bit loud but still not too bad. If the muffler shop was closer, I'd get 'em replaced -- and I'd try to get the same thing. BTW no loud, sharp 'rap', ever. And no offense to anyone, but I don't care for the hollow, 'echo'chamber' sound of Flowmasters.
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- Mike - 1972 K20 LWB 350/350/205 RIP El Jay |
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#7 |
Senior Member
![]() Join Date: Jul 2004
Location: Estherville, Iowa
Posts: 3,371
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Re: glasspacks.....
I might try glasspacks on our current project, but I think the common short ones are too loud, if you can find some nice long ones and run the exhaust back of the tires or out by rear bumper it might be pretty good, depends on motor and cam size somewhat too and if you have headers, etc, how loud it might be.
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1968 C10 307 3spd Long Fleet ------ http://67-72chevytrucks.com/vboard/s...d.php?t=201103 1970 C10 305 Super T10 Long Fleet --- http://67-72chevytrucks.com/vboard/s...d.php?t=202285 1971 C20 383 TH350 Dana Posi ----- http://67-72chevytrucks.com/vboard/s...d.php?t=206894 2001 GMC Sierra 1500 C3 6.0 |
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#8 |
Registered User
Join Date: Sep 2004
Location: Pleasanton, TX
Posts: 1,723
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Re: glasspacks.....
Used to own a 66 Chevy 1/2 ton. 283 2 brl with a 350 cam and 3 speed on the column. Stock exhaust manifolds with duals out past the rear bumper. I loved the glass packs on it. Would sound off when I wanted it to but not too loud in the cab
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#9 |
DON'T TREAD ON ME
![]() Join Date: May 2005
Location: Crosby County, TX
Posts: 989
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Re: glasspacks.....
Before doing the engine build I had headers and 18" glass packs with a regular dual exhaust. It wasn't too loud. I think the average person who likes the rumble of a V-8 would like it and I got lots of complements.
My new exhaust is a different animal. This one has the engine in the sig with headers, 12" glass packs and a 2 1/2" exhaust. Let's just say it's not for everyone. I think there are two kinds of glasspacks. One has perferations in the inner tube and the other has louvers. I think my old ones had the perferations but the new ones have the louvers. IIRC, the opening of the louvers are supposed to face the engine in order to muffle the sound. I figured this would only slow the exhaust velocity and rob HP so I turned them facing the back. Trust me when I say that they definitely give meaning to the phrase in my User Title. ![]()
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Old Yeller |
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#10 |
Registered User
Join Date: Apr 2004
Location: arkieland
Posts: 1,070
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Re: glasspacks.....
I have them on my 79 Ford f350, I don't drive it much & seams were always splitting on reg muffs & turbos after just a yr or so. 5 years+ & still going strong. they sound OK, the longer ones are more mellow,,brian
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#11 |
Aluminum slot wheels rule...
Join Date: Jan 2006
Location: Maine
Posts: 6,212
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Re: glasspacks.....
To make glasspacks really loud, get them hot, then dump some water down in them. It breaks up the the inside to make them louder. I read that somwhere, maybe Hot Rod magazine.
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#12 |
blood type; Retumbo
Join Date: Jan 2004
Location: next to my reloading bench
Posts: 10,269
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Re: glasspacks.....
OldYeller, that's excactly what I have on my 68. it can and does get somewhat annoying. but my 3 year old son seems to like it. he just sits there and smiles when riding with me. on the fun side is the kids with thier fart-can piped Hondas. I let 'er rip and they shut up in a hurry.
I am thinking of installing another pair up front and maybe even a balance tube. |
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#13 |
Registered User
Join Date: Apr 2006
Location: North alabama
Posts: 111
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Re: glasspacks.....
I got some, they are really big in diameter, but i couldn't tell you a size, because my trucks in the shop. They aren't bad, but can get too loud when going up a hill while the truck is on boarderline of a gear change..
Heres the best pic i have ![]() They have a good sound, and not quite as loud as flow masters.. |
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#14 |
Registered User
Join Date: Jun 2004
Location: Beeville, Texas
Posts: 1,943
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Re: glasspacks.....
I have 2 1/4" duals with 18" glasspacks on my truck that dump right behind the cab with turndowns. They are really loud when you get down on it or if you're driving it on the highway.(4.10 gears with 1:1 tranny, the engine really winds up!) They aren't real loud just cruising around, but just give it some gas and you'll be setting off car alarms.
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RJD 1984 Chevrolet C30 welding truck 454/SM465 1977 GMC C15 pickup 350/TH350 1970 Chevrolet C20 pickup 350/TH400 1970 Chevrolet K20 Suburban 454/TH350 1969 GMC 8500 478M V6/5 spd winch truck |
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#15 |
Still drivin' a Rat Rod
Join Date: Sep 2004
Location: Monett Missouri
Posts: 4,925
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Re: glasspacks.....
I have the same setup on my truck.Too loud to hear the stereo in town,and waaayyy too loud on hte hiway IMO.If the pipe was longer,and they turned down at the rearend it wouldn't be bad.
If you place them in the middle of the pipe they sound like crap,pretty mellow old dumptruck sound on the end of the pipe.I'm going to flowmasters turned down at the rearend hopefully tomorrow,have the stuff,hoping for the time. I would go for a nice pair of turbos,they sound better IMO.
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Rusty Member #13872 Instead of saying.....you are a discomfort in the back of my front.....one should be able to say...... you are a pain in the *a$#* 71 GMC LWB 49 Chevy 85 Chevy G20 Check out my website |
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#16 |
Oil trash and damn proud of it
Join Date: Aug 2005
Location: Williston, ND
Posts: 1,993
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Re: glasspacks.....
well, you could modify the exhaust "design" from my truck to meet legality (at least here, mine's just shy of legal, haha)
straight off the headers, a few inches of pipe, short glasspacks, and a couple feet of pipe, then the duals end right before the end of the cab. With this truck pushing probably like 3500rpm doing like 55-65 (who knows how fast, with those old speedometers, and those steep gears) I had to yell at my buddy sitting right next to me, and I couldn't really think very well. To the point, with an exhaust like I got, your truck would be pretty loud. Sure, it sounds almost like a derby car, but hell, it gets the job done, the ears done, and everyone else either covering their ears, running for cover, or drooling over your exhaust.
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Mark 1997 K1500 Z71, 14 bolt SF 3.73 posi, Bright Blue Metallic. 6" Superlift 1972 C-10, toolbox, p/s, 350/TH350/3.73 open, black int., bronze 2008 Dodge MegaCab. H&S tuned 6.7 Cummins. Fast Four Tons Some of my pics http://s107.photobucket.com/albums/m294/69-350/ |
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#17 |
WTB this ad
Join Date: Sep 2004
Location: Lafayette Georgia
Posts: 5,074
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Re: glasspacks.....
I had a 71 GMC that I ran some 36" glasspacks on. I don't think you could fit them on a coil spring truck though. They started at the back of the cab and went up above the rearend at an angle. When they were new they were real quiet like a turbo. Once they had some miles on them they got a real sweet deep sound to them. They are a cheap alternative to flows if you have the room to run them.
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#18 | |
Account Suspended
Join Date: Sep 2005
Location: Monroe, WA
Posts: 3,815
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Re: glasspacks.....
Quote:
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#19 | |
Account Suspended
Join Date: Sep 2005
Location: Monroe, WA
Posts: 3,815
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Re: glasspacks.....
Quote:
http://store.summitracing.com/egnsea...ts=false&N=115 |
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#20 |
Registered User
Join Date: Sep 2003
Location: Boise ID
Posts: 609
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I run the Force Pro Series mufflers. 29.88 ea from SUMMIT. They are 2 chamber like the super 40's. I run my exhaust straight out the rear. I have A fairly large cam. I really like the sound. Come on 29.88 ea from summit!! You cant go wrong.
![]() Gary
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"72" Red CORVETTE 4-speed 350 "70" Chevy Short Bed early stages of resto. Edel 600 cfm carb Weiand Stealth Intake HEI shorty Headers 4/2 Drop 295 50R 15 TOYO on 10 inch wide corvette rally rims at all 4 corners. "CHEVY RULES" ![]() |
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#21 |
Registered User
Join Date: Jul 2001
Location: reno, nv
Posts: 646
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Re: glasspacks.....
thanks for all input. the pipe from the header into the muffler is good (blown seams on muffler) and the pipe from the back of the muffler is also good. i'm trying to find the best sounding muffler with the correct dimension for an "easy" swap, if that is even possible. thanks again guys. we have a summit in town, maybe i'll go and take a look.
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70 LWB, 350/350 A/C, P/S, 3 Tone Paint (white cap, primer gray with black guide coat) |
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#22 | |
Still drivin' a Rat Rod
Join Date: Sep 2004
Location: Monett Missouri
Posts: 4,925
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Re: glasspacks.....
Quote:
Good luck
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Rusty Member #13872 Instead of saying.....you are a discomfort in the back of my front.....one should be able to say...... you are a pain in the *a$#* 71 GMC LWB 49 Chevy 85 Chevy G20 Check out my website |
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#23 | |
Watch out for your cornhole !
![]() Join Date: Jun 2003
Location: Azle, Texas
Posts: 14,162
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Re: glasspacks.....
Quote:
On subject though, I run 18 inch glasspacks on my beater. 15 bucks each at the muffler shop. I do all my own exhaust work, just buy pipe from the muffler shop, but he offered to sell me the packs as cheap as I could order them mailorder for. I'm very happy with them. I like them as well as any Flowmasters I've ever had.
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I'm on the Instagram- @Gearhead_Kevin Last edited by Tx Firefighter; 05-02-2006 at 07:18 AM. |
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#24 |
No,I DON'T have Tourett's
Join Date: Mar 2005
Location: Reno, NV
Posts: 556
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Re: glasspacks.....
I put a set of 30" cherry bombs on the flatbed. Sounds great with headers and the 396.
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'72 K5 CST 350/350 Daily Driver '69 GMC3500 Camper Special CST Flatbed 396/400 Upgraded to show truck '69 GMC 2500 L6292, 3spd beater |
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#25 |
Formerly yellow72custom
Join Date: May 2001
Location: Austin, TX
Posts: 7,531
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Re: glasspacks.....
I used to have 12" glasspacks with headers and a 350 in my C10, along with 3"x24" tips at the end. It was really loud, but sounded too cackly. Not very mellow, and kinda annoying. Glasspacks sound OK if set up right, but don't go with short ones like 18" or 12". I've got Flowmasters on it now and it sounds much better, although it is equally as loud.
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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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