Question for people who know exhaust! - Page 2 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

*wolfthing2000* · 08-02-2005, 04:42 PM

luv2x, what would you reccomend for a moderately built 383 with 1 5/8 headers ( long tube). I want to exit at the rear corners. H pipe or not Dia. of tubes for an RV puller engine, roller cam, 750 cfm carb, flat top pistons.

LUV2XCLR8 · 08-02-2005, 05:14 PM

Quote:

Originally Posted by wolfthing2000

luv2x, what would you reccomend for a moderately built 383 with 1 5/8 headers ( long tube). I want to exit at the rear corners. H pipe or not Dia. of tubes for an RV puller engine, roller cam, 750 cfm carb, flat top pistons.

Me no expert, but on my hompage I posted this if it helps ya any

Robert1970C20rstbukt · 08-02-2005, 06:31 PM

If you want LOUD, go with dual 12" glasspacks. I'm going with 18's and from what the guy at the muffler shop said, these are just as loud as the 12's. It's gonna have 2.25 coming from the engine to the mufflers, then 2.25 out either dumping in front of the rear end, or angled out behind the tires. I ain't sure yet.

Russell · 08-02-2005, 07:06 PM

My GMC has a set of true dual 2.5 inch pipes with a set of Flo Pro mufflers, along with a set of cheapy headers. The truck sounded simply awesome all the way around. At an idle, you could definitely hear every cylinder fire from each pipe, but it wasn't obnoxiously loud by any means. When you were just crusing, the truck was actually pretty quiet, you could definitely hear it, but she wasn't droning, or being excessively loud. However, when you punched it, that truck roared like she had no pipes at all.

Crusing down the highway was nice, no droning until about 75 mph. All around a very nice setup in my opinion. All of this was on a fairly stock 350

If you want sound clips, I have a pair I can email to you, just PM me

71Dragtruck · 08-02-2005, 10:29 PM

Had the same problem when I was young, every one was running loud mufflers and after saving up my cash I put on duel 13" glass packs. My dissapointment when it was still not very loud, didn't have much of a rap and a mellow idle, everyone laughed at me. THEN I put on a set of headers, and let me tell you what a differance, rumble at idle and could wake the town when hard on the gas.

MandarinSixSeven · 08-03-2005, 12:30 AM

Here is a video of the truck idling and revving

and here is one of it really revving...I just couldn't resist, i wish I would have done it longer now

.

*wolfthing2000* · 08-03-2005, 12:09 PM

Okay, so 2 1/2 pipes is also what the muffler shop reccomended. My next question is who can say what, yea or ney from experience and or hearsay about the H pipe set up ( crossover) before the mufflers?????

matthufham · 08-03-2005, 12:30 PM

the crossover belongs as close to the engine as possible.

as i was messing around yesterday i decided to fab up my exhaust. comes from headers into the 3 inch racing cutouts, with old oil field caps i can take off on each side to run it open headers. goes to 2 1/2" pipe to the flowmaster 40's, then 2 inch pipe running in front of the rear wheel.

not pretty, but functional, and loud.

also when i was at flowmanster's website trying to figure out what kind of mufflers these were i was in their store and found these.
http://www.flowmastermufflers.com/accessories.html

standard h pipe...

and then these. i can take the spare tubing in my backyard, and make myself an h pipe. sweet. (10 per pack)

Johns70 · 08-03-2005, 12:48 PM

I think it sounds great just the way it is, especially when its reving up in the clip.

chevyfarmer · 08-03-2005, 12:51 PM

MandrinSixSeven The video's are sweet! I think more people here should post burnout clips. Great looking truck also.

mathufham, what kind of oil caps are those? Could you post some more pics once you get that system installed? Looks like a cool setup and would like to see more.

71-longbed · 08-03-2005, 12:51 PM

nice vids ...

matthufham · 08-03-2005, 12:57 PM

Quote:

Originally Posted by chevyfarmer

mathufham, what kind of oil caps are those? Could you post some more pics once you get that system installed? Looks like a cool setup and would like to see more.

well there's no engine so i can't bolt the headers on, and that's 1 of 3 mounting points. there's no bed so i can't hang the rear of the exhaust, (2 of 3) and basically the system would dangle on the middle hanger.

the caps were made by the previous owner, he had a farm. he had an oil field too and it's some sort of cap you would find there on a tractor or some old field piping. you can buy cutoffs like that from jegs or summit and they have 3 wingnuts on each side, with mine, you bend back the 2 tabs (with a hammer, they're stiff) and they pop off. you can also get electric ones or ones with a pull system so you can open them inside the truck. stacy from TRUCKS had electric ones on copperhead.

mplex2000 · 08-03-2005, 01:38 PM

I'll be welding up my exhaust soon and it should sound pretty healthy...I've done a lot of exhaust in the past as well. I'm going with full tube headers (Cyclone or something, they came on the truck when I bought it), mandrel 2.5 bends, Dynomax welded ultraflo mufflers (Magnaflow should sound about the same) with turndowns in front of the axle.

Can't wait to hear it...the straight thru mufflers usually give the most sound (Flowmasters give a lot of sound, but they're poor performers).

If you go with straight through mufflers, go with good ones. Make sure they're perforated core rather than louvered core.

Right now my poor truck has cheapo louvered core glasspacks clampled to the headers, no pipes. It sounds really mean but it's real slow (big cam and victor jr intake, not really a truck motor!).

68Stepbed · 08-03-2005, 01:39 PM

Mandarinsixseven, First off, awsome videos!

Next, I would recommend 2.5 inch exhaust with regular 40 series Flowmaster mufflers and an X-pipe. The x-pipe will also make a sound difference.

The loudest exhaust I've ever heard was an old F#^d truck with a tired 302 with 1.5 inch pipe and old burntout glasspacks. Darn thing would dang near bust an ear drum.

I think the truck sounds great like it is. A whole lot better than my cheapo turbos on my truck. To each his own though.

Just my .02

Matt

Brainchild · 08-03-2005, 02:00 PM

Quote:

Originally Posted by tripp

i think it may be because you're using the ramhorn manifolds. i've noticed on my trucks that everything that has cast iron manifolds has a more mellow less aggressive sound.

This may be true.I'm running ramhorns with 2 1/4 pipe with glasspacks that end right at the back of the cab,and it's not all that loud.This is basically the same length as a header muffler.My brothers 72 with headers,and 2 1/4 pipe and turbos at the diff is louder.

CST*TEN in Katy · 08-03-2005, 03:33 PM

"the crossover belongs as close to the engine as possible."

So would you put the H pipe up close and under the trans pan? I was thinking about further back and tucking it in the crossmenber. Or would you move it forward and insulate it?

matthufham · 08-03-2005, 06:09 PM

hard to tell without my engine, but i have long tube headers where everything hangs below the trans pan.

Robert1970C20rstbukt · 08-03-2005, 11:24 PM

I just put an 18" glasspack on my ramhorn single exhaust that exits right behind the cab coming straight out of the muffler, and it is really loud when you give it the gas. I'm talkin straight 2.5" pipe loud, and it'll still rumble with the engine idling. Guess it just depends on the ways that these mufflers are made. I bought it for 25 bucks at the muffler shop and just bolted it on. I don't know what brand it is, and it's not painted either, just raw steel. I'm gonna sand it down and and paint it with high heat chevy orange paint. As soon as I can afford it the duals are going on.

69 Short Fleet · 08-04-2005, 02:31 AM

Stop by and have listen when you get a chance Benson. Tom at Precision Muffler does pretty nice work. Regards Doug

camaro__thunder · 08-04-2005, 02:43 AM

Whoa guys.. I had 3" exhaust with an H pipe and one chamber flows dumped at the rearend on my Stroker Camaro and it was the best sounding exhaust I ever had. The car sounded like thunder as it loped its butt off.. hence my screen name. Especially around 1800rpm it wasn't loud it just hit hard and resonated everything around.. (fun times in parking lots) I am adapting that same exhaust to go on my truck and will see how its sounds with my somewhat mild 355 using the 3/4 chevelle headers and dump it right through the trailing arm crossmember. I dont have any room with the rockers planted. Should get it welded up in a few weeks. Bo

72MARIO · 08-04-2005, 03:36 PM

Hey Camaro Dude,

I have 3/4 chevelle headers into 3" manderal to super 40's. 355 mildly built. I have the exhaust tucked up over the stock tranny crossmamber and cut out the crossmember to fit the 3" thru. It dumps under the box. I love the way it sounds but I am planning on running tail pipes to dump in front of the wheels. Most likly not possible on you truck being that low.

SweetandLong68 · 08-08-2005, 09:53 PM

A good built motor with some compression and a cam....Some good headers....3" pipe and Super 40 flowmasters. And of course no tailpipes after the mufflers...That is all you need...

lata
CHRIS

08-02-2005, 06:31 PM	#28
Robert1970C20rstbukt Registered User Join Date: Jun 2004 Location: Beeville, Texas Posts: 1,943	If you want LOUD, go with dual 12" glasspacks. I'm going with 18's and from what the guy at the muffler shop said, these are just as loud as the 12's. It's gonna have 2.25 coming from the engine to the mufflers, then 2.25 out either dumping in front of the rear end, or angled out behind the tires. I ain't sure yet. __________________ 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 Last edited by Robert1970C20rstbukt; 08-03-2005 at 01:37 AM.

08-02-2005, 07:06 PM	#29
Russell Professional Grade Join Date: May 2003 Location: Fort McMurray, Alberta Posts: 7,915	My GMC has a set of true dual 2.5 inch pipes with a set of Flo Pro mufflers, along with a set of cheapy headers. The truck sounded simply awesome all the way around. At an idle, you could definitely hear every cylinder fire from each pipe, but it wasn't obnoxiously loud by any means. When you were just crusing, the truck was actually pretty quiet, you could definitely hear it, but she wasn't droning, or being excessively loud. However, when you punched it, that truck roared like she had no pipes at all. Crusing down the highway was nice, no droning until about 75 mph. All around a very nice setup in my opinion. All of this was on a fairly stock 350 If you want sound clips, I have a pair I can email to you, just PM me __________________ 1995 Chevrolet 2 Door Tahoe (6.6L LBZ Duramax / ZF6 / NP241 with 1 ton solid axle swap)

08-03-2005, 12:30 AM	#31
MandarinSixSeven Seasonal Poster Join Date: Apr 2002 Location: Kelowna BC Canada Posts: 896	Here is a video of the truck idling and revving and here is one of it really revving...I just couldn't resist, i wish I would have done it longer now . __________________ 67 GMC Short Step 350/4-Speed/3.08 Posi Front/Rear Sway Bars Kelowna BC, Canada Member of DTPW

08-03-2005, 12:30 PM	#33
matthufham Registered User Join Date: Feb 2005 Location: Carl Junction, Missouri Posts: 2,061	the crossover belongs as close to the engine as possible. as i was messing around yesterday i decided to fab up my exhaust. comes from headers into the 3 inch racing cutouts, with old oil field caps i can take off on each side to run it open headers. goes to 2 1/2" pipe to the flowmaster 40's, then 2 inch pipe running in front of the rear wheel. not pretty, but functional, and loud. also when i was at flowmanster's website trying to figure out what kind of mufflers these were i was in their store and found these. http://www.flowmastermufflers.com/accessories.html standard h pipe... and then these. i can take the spare tubing in my backyard, and make myself an h pipe. sweet. (10 per pack) Last edited by matthufham; 08-03-2005 at 12:42 PM.

08-03-2005, 12:48 PM	#34
Johns70 Registered User Join Date: Dec 2001 Location: Spring Creek, nevada. U.S.A. Posts: 456	I think it sounds great just the way it is, especially when its reving up in the clip. __________________ 69 chevy short wide box project 70 GMC jimmy project

08-02-2005, 04:42 PM	#26
wolfthing2000 Account Suspended Join Date: Oct 2004 Posts: 1,276	luv2x, what would you reccomend for a moderately built 383 with 1 5/8 headers ( long tube). I want to exit at the rear corners. H pipe or not Dia. of tubes for an RV puller engine, roller cam, 750 cfm carb, flat top pistons.

08-02-2005, 10:29 PM	#30
71Dragtruck Registered User Join Date: Jun 2004 Location: Saskatchewan, Canada Posts: 1,368	Had the same problem when I was young, every one was running loud mufflers and after saving up my cash I put on duel 13" glass packs. My dissapointment when it was still not very loud, didn't have much of a rap and a mellow idle, everyone laughed at me. THEN I put on a set of headers, and let me tell you what a differance, rumble at idle and could wake the town when hard on the gas.

08-03-2005, 12:09 PM	#32
wolfthing2000 Account Suspended Join Date: Oct 2004 Posts: 1,276	Okay, so 2 1/2 pipes is also what the muffler shop reccomended. My next question is who can say what, yea or ney from experience and or hearsay about the H pipe set up ( crossover) before the mufflers?????

08-03-2005, 12:51 PM	#35
chevyfarmer Registered User Join Date: Feb 2005 Location: Owosso, Mi Posts: 242	MandrinSixSeven The video's are sweet! I think more people here should post burnout clips. Great looking truck also. mathufham, what kind of oil caps are those? Could you post some more pics once you get that system installed? Looks like a cool setup and would like to see more. __________________ 67 short wide 355ci 3 on tree 69 short wide 250ci 3 on tree 68 long wide 283 3 on tree 72 2wd Blazer project 454 5 speed Last edited by chevyfarmer; 08-03-2005 at 12:51 PM.

08-03-2005, 12:51 PM	#36
71-longbed Its Magically Delicious Join Date: Jan 2003 Location: oregon Posts: 2,398	nice vids ... __________________ 71 C10 LWB 350sbc -TH350 12 bolt 3.42 Posi Of all my favorite things to do, The utmost is to have a brew. My love grows for my foamy friend, with each thirst-quenching elbow bend. Beer so frosty, smooth, and cold it's paradise pure liquid gold. Yes beer means many things to me that's all for now cus I gotta pee.

08-03-2005, 01:38 PM	#38
mplex2000 Registered User Join Date: Jul 2005 Location: DFW Posts: 463	I'll be welding up my exhaust soon and it should sound pretty healthy...I've done a lot of exhaust in the past as well. I'm going with full tube headers (Cyclone or something, they came on the truck when I bought it), mandrel 2.5 bends, Dynomax welded ultraflo mufflers (Magnaflow should sound about the same) with turndowns in front of the axle. Can't wait to hear it...the straight thru mufflers usually give the most sound (Flowmasters give a lot of sound, but they're poor performers). If you go with straight through mufflers, go with good ones. Make sure they're perforated core rather than louvered core. Right now my poor truck has cheapo louvered core glasspacks clampled to the headers, no pipes. It sounds really mean but it's real slow (big cam and victor jr intake, not really a truck motor!).

08-03-2005, 01:39 PM	#39
68Stepbed Registered User Join Date: Mar 2005 Location: 10-Uh-See Posts: 5,609	Mandarinsixseven, First off, awsome videos! Next, I would recommend 2.5 inch exhaust with regular 40 series Flowmaster mufflers and an X-pipe. The x-pipe will also make a sound difference. The loudest exhaust I've ever heard was an old F#^d truck with a tired 302 with 1.5 inch pipe and old burntout glasspacks. Darn thing would dang near bust an ear drum. I think the truck sounds great like it is. A whole lot better than my cheapo turbos on my truck. To each his own though. Just my .02 Matt __________________ Matt 68 C10 stepside, LS1/700R4, TCI Engineering suspension system

08-03-2005, 03:33 PM	#41
CST*TEN in Katy Registered User Join Date: Jul 2005 Location: Katy, TX Posts: 48	"the crossover belongs as close to the engine as possible." So would you put the H pipe up close and under the trans pan? I was thinking about further back and tucking it in the crossmenber. Or would you move it forward and insulate it? __________________ 1970 CST-10 owned it 26 years, finally back on the road after a 10 year rest. 1989 Suburban 1971 Sleekcraft 455Olds Berkeley 1992 SC400 pimp ricer

08-03-2005, 06:09 PM	#42
matthufham Registered User Join Date: Feb 2005 Location: Carl Junction, Missouri Posts: 2,061	hard to tell without my engine, but i have long tube headers where everything hangs below the trans pan.

08-03-2005, 11:24 PM	#43
Robert1970C20rstbukt Registered User Join Date: Jun 2004 Location: Beeville, Texas Posts: 1,943	I just put an 18" glasspack on my ramhorn single exhaust that exits right behind the cab coming straight out of the muffler, and it is really loud when you give it the gas. I'm talkin straight 2.5" pipe loud, and it'll still rumble with the engine idling. Guess it just depends on the ways that these mufflers are made. I bought it for 25 bucks at the muffler shop and just bolted it on. I don't know what brand it is, and it's not painted either, just raw steel. I'm gonna sand it down and and paint it with high heat chevy orange paint. As soon as I can afford it the duals are going on. __________________ 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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08-04-2005, 02:31 AM	#44
69 Short Fleet Registered User Join Date: Nov 2002 Location: Kelowna B.C. Canada Posts: 1,086	Stop by and have listen when you get a chance Benson. Tom at Precision Muffler does pretty nice work. Regards Doug

08-04-2005, 02:43 AM	#45
camaro__thunder Epoxy Primer Friendly Join Date: Feb 2004 Location: South of Houston TEXXXAS Posts: 680	exhaust Whoa guys.. I had 3" exhaust with an H pipe and one chamber flows dumped at the rearend on my Stroker Camaro and it was the best sounding exhaust I ever had. The car sounded like thunder as it loped its butt off.. hence my screen name. Especially around 1800rpm it wasn't loud it just hit hard and resonated everything around.. (fun times in parking lots) I am adapting that same exhaust to go on my truck and will see how its sounds with my somewhat mild 355 using the 3/4 chevelle headers and dump it right through the trailing arm crossmember. I dont have any room with the rockers planted. Should get it welded up in a few weeks. Bo __________________ My Project 69 SWB SHAVED BAGGED DOORED

08-04-2005, 03:36 PM	#46
72MARIO Registered User Join Date: Nov 2000 Location: Huntsville Ontario Canada Posts: 4,052	Hey Camaro Dude, I have 3/4 chevelle headers into 3" manderal to super 40's. 355 mildly built. I have the exhaust tucked up over the stock tranny crossmamber and cut out the crossmember to fit the 3" thru. It dumps under the box. I love the way it sounds but I am planning on running tail pipes to dump in front of the wheels. Most likly not possible on you truck being that low. __________________ 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

08-08-2005, 09:53 PM	#47
SweetandLong68 Your UncleBen Join Date: Dec 2002 Location: Indian Trail, NC Posts: 590	A good built motor with some compression and a cam....Some good headers....3" pipe and Super 40 flowmasters. And of course no tailpipes after the mufflers...That is all you need... lata CHRIS __________________ 68 C10 shortbed -- Street/Strip

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