Mufflers for the 250cid Six banger? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

kyull67 · 10-03-2007, 01:13 PM

I just bought the clifford split headers, offenhauser intake, and a Holley 390cfm Carb.

Now I'm getting ready to buy mufflers. In your opinion what is the best muffler to go with for both sound and performance with my split headers?
Thanks.

Texasdeere · 10-03-2007, 02:59 PM

Were you planning on a dual system or a single pipe?

How loud do you want it?

I think best performance and sound will be with a single 2.5" system. The muffler depends on the type of sound you want.

kyull67 · 10-03-2007, 03:16 PM

I think it would be best to run duals. The header is split; cylinders 1-3 out of the first collector and cylinders 4-6 out of the second. I've heard people talk about the unique sound of a "split six" so I want to go for that. As far as noise level, I want it to be fairly loud. What are some of you other straight six guys using for mufflers?

nplocoman · 10-03-2007, 03:47 PM

On my 292 turbos sound terrible

LUV2XCLR8 · 10-03-2007, 03:54 PM

I worked PT at a muffler and brake shop for 3 years. I would run everything out 2
where the mufflers are going to be. Use a couple of stands and a few rags. Get a
person up in your truck. Have them hold up different mufflers that are available &
use the rags to rap around the front connection. We did this on GQ, I went from
wanting Flowmasters to buying Magnaflows* without even blinking. A GOOD SHOP
is willing to do this, most shops won't bother unboxing 2 of each. Make sure they
goose it a few times on each to hear the different sound levels. Hope this helps

*I have Magnaflows on GQ, but MERLOT will have Borlas

kyull67 · 10-03-2007, 04:23 PM

Quote:

Originally Posted by LUV2XCLR8

I worked PT at a muffler and brake shop for 3 years. I would run everything out 2
where the mufflers are going to be. Use a couple of stands and a few rags. Get a
person up in your truck. Have them hold up different mufflers that are available &
use the rags to rap around the front connection. We did this on GQ, I went from
wanting Flowmasters to buying Magnaflows* without even blinking. A GOOD SHOP
is willing to do this, most shops won't bother unboxing 2 of each. Make sure they
goose it a few times on each to hear the different sound levels. Hope this helps

*I have Magnaflows on GQ, but MERLOT will have Borlas

That's a great idea! Why didn't I think of that?
Thanks.

LUV2XCLR8 · 10-03-2007, 04:26 PM

No idea

**Boog** · 10-03-2007, 05:10 PM

I vote for a pair of the old time Smittys mufflers or just a pair of store bought glass packs with 2 1/4" pipes all the way out the back. Yeah, it'll talk to ya.

chvtrkman · 10-06-2007, 05:28 PM

I'm running a pair of Summit Racing welded mufflers (Summit part# 633222) through 2 1/2" pipes in/out.
They are reasonable at idle but when you rev it up they are a bit louder than what I wanted. Sound good though.....almost like a WW II fighter plane. This is on a 292....I imagine they would be similar on a 250.

samwise68 · 10-06-2007, 06:09 PM

i say glasspacks, especially with the split six sound.

it works out so that the firing order has a cylinder firing in the alternating pipe.

1-5-3-6-2-4.

so, front-back-front-back-front-back.
hense. that lovely sound known as split six.

.

should be a snappy engine. and i stand by the 'packs for it.

-Sam.

JAKES 68GMC · 10-06-2007, 08:17 PM

I vote for Smithys, I heard them on a 216 Chevy that had cast-iron headers and dual 1-barrels. It was the sweetest sound I've ever heard.

**jerry moss** · 10-06-2007, 09:43 PM

12 inch glasspacks, turned backwards, as close as possible to the collectors, 1 3/4 inch tailpipes as straight as possible out the back. that S.O.B. will rattle windows for 3 blocks. this is if you want it LOUD.
a pair of longer glasspacks farther back with 2 inch tailpipes will be nice and mellow.
been in the same muffler shop almost 23 years now and done several old chevys with split 6's, the first way is loud enough to draw attention from every cop in town

67_C-30 · 10-06-2007, 10:49 PM

I heard a split 6 header on a 250 with dual chambered muffler like what came on 69 Z28's, and it sounded wicked. You can get these here:
http://www.classicchambered.com/classic/sounds.html

Big D · 10-07-2007, 11:07 PM

I'm running a thrush turbo on mine, It had one of those bargin 18" glass-packs on it when I got it and it sounded like a vacumn cleaner on steriods. The turbo gives it a nice throaty sound.

10-03-2007, 01:13 PM	#1
kyull67 Registered User Join Date: Nov 2006 Location: Springfield/Kansas City Posts: 1,842	Mufflers for the 250cid Six banger? I just bought the clifford split headers, offenhauser intake, and a Holley 390cfm Carb. Now I'm getting ready to buy mufflers. In your opinion what is the best muffler to go with for both sound and performance with my split headers? Thanks. __________________ The first '67 The current '67 '63 Biscayne

10-03-2007, 02:59 PM	#2
Texasdeere Registered User Join Date: Sep 2006 Location: League City, Texas Posts: 732	Re: Mufflers for the 250cid Six banger? Were you planning on a dual system or a single pipe? How loud do you want it? I think best performance and sound will be with a single 2.5" system. The muffler depends on the type of sound you want. Last edited by Texasdeere; 10-03-2007 at 03:02 PM.

10-03-2007, 03:16 PM	#3
kyull67 Registered User Join Date: Nov 2006 Location: Springfield/Kansas City Posts: 1,842	Re: Mufflers for the 250cid Six banger? I think it would be best to run duals. The header is split; cylinders 1-3 out of the first collector and cylinders 4-6 out of the second. I've heard people talk about the unique sound of a "split six" so I want to go for that. As far as noise level, I want it to be fairly loud. What are some of you other straight six guys using for mufflers? __________________ The first '67 The current '67 '63 Biscayne

10-03-2007, 03:47 PM	#4
nplocoman never finish start another Join Date: Mar 2007 Location: North Platte Nebraska Posts: 432	Re: Mufflers for the 250cid Six banger? On my 292 turbos sound terrible

10-03-2007, 03:54 PM	#5
LUV2XCLR8 The LuvShack Garage Join Date: Jan 2004 Location: Maple Grove, TN (West Side) Posts: 30,468	Re: Mufflers for the 250cid Six banger? I worked PT at a muffler and brake shop for 3 years. I would run everything out 2 where the mufflers are going to be. Use a couple of stands and a few rags. Get a person up in your truck. Have them hold up different mufflers that are available & use the rags to rap around the front connection. We did this on GQ, I went from wanting Flowmasters to buying Magnaflows* without even blinking. A GOOD SHOP is willing to do this, most shops won't bother unboxing 2 of each. Make sure they goose it a few times on each to hear the different sound levels. Hope this helps *I have Magnaflows on GQ, but MERLOT will have Borlas __________________ Owner/Op: "TN Classic Transport Carriers" The Toy: "Square Vette" 72 Hybrid Blazer Toy Barn: "LuvShack" 40 x 60 x 20 Shop Tow Piggy:"Maddy" 88 Silverado 3500 Hauler: "Feathers" 14 Aluma 8218T

10-03-2007, 04:26 PM	#7
LUV2XCLR8 The LuvShack Garage Join Date: Jan 2004 Location: Maple Grove, TN (West Side) Posts: 30,468	Re: Mufflers for the 250cid Six banger? No idea __________________ Owner/Op: "TN Classic Transport Carriers" The Toy: "Square Vette" 72 Hybrid Blazer Toy Barn: "LuvShack" 40 x 60 x 20 Shop Tow Piggy:"Maddy" 88 Silverado 3500 Hauler: "Feathers" 14 Aluma 8218T

10-03-2007, 05:10 PM	#8
Boog laying low Join Date: Mar 2001 Location: Searcy, Ark. USA Posts: 13,514	Re: Mufflers for the 250cid Six banger? I vote for a pair of the old time Smittys mufflers or just a pair of store bought glass packs with 2 1/4" pipes all the way out the back. Yeah, it'll talk to ya. __________________ Boog 69 Chevy stepside, 358/T350, 4.11 posi, 4.5/4 drop, rallys, poboy driver primer is finer 91 Chevy sportside, Tahoe, Yukon & GMC Crewcab All GM..'nuff said. I stand for the flag and kneel at the cross

10-06-2007, 05:28 PM	#9
chvtrkman Registered User Join Date: Sep 2007 Location: PA. Posts: 178	Re: Mufflers for the 250cid Six banger? I'm running a pair of Summit Racing welded mufflers (Summit part# 633222) through 2 1/2" pipes in/out. They are reasonable at idle but when you rev it up they are a bit louder than what I wanted. Sound good though.....almost like a WW II fighter plane. This is on a 292....I imagine they would be similar on a 250. __________________ _____________________________________________ 69 C-20 292, 4 spd O/D, 4:56 rears. No a/c p/s p/b p/w......restoration project,"Operation:Stovebolt" 78 C-10 305 TH350 new (old) daily driver 02 Suburban Z71 a.k.a. the family truckster 99 Silverado 1500 Z71

10-06-2007, 08:17 PM	#11
JAKES 68GMC Aluminum slot wheels rule... Join Date: Jan 2006 Location: Maine Posts: 6,211	Re: Mufflers for the 250cid Six banger? I vote for Smithys, I heard them on a 216 Chevy that had cast-iron headers and dual 1-barrels. It was the sweetest sound I've ever heard.

10-06-2007, 09:43 PM	#12
jerry moss Born Psycho Join Date: Feb 2001 Location: brentwood,cal,usa Posts: 4,936	Re: Mufflers for the 250cid Six banger? 12 inch glasspacks, turned backwards, as close as possible to the collectors, 1 3/4 inch tailpipes as straight as possible out the back. that S.O.B. will rattle windows for 3 blocks. this is if you want it LOUD. a pair of longer glasspacks farther back with 2 inch tailpipes will be nice and mellow. been in the same muffler shop almost 23 years now and done several old chevys with split 6's, the first way is loud enough to draw attention from every cop in town __________________ jerry moss 72 cheyenne super K20- tilt,tach,vacuum,speedwarning,buckets,shoulder belts,am/fm,tow hooks,bumper guards,toolbox,aux. fuel tank,posi front and rear,plus other goodies!!! SOLD 69 suburban K20-tilt,tach,vacuum,speedwarning,buckets,shoulder belts,am/fm,4 inch all spring lift,4 speed, 14 bolt full floater, dana 44 HD,warn winch,posi front and rear,tow hooks,plus other goodies. 73/80 chevy/gmc K20 SB400,turbo 400,205,tilt,a-c,gas hog. 77 K/5 cheyenne blazer-daily driver/beater. SON HAS IT NOW BRENTWOOD,CALIFORNIA

10-06-2007, 10:49 PM	#13
67_C-30 I have a radical idea! Join Date: Jan 2005 Location: Sweet Home Alabama! Posts: 6,513	Re: Mufflers for the 250cid Six banger? I heard a split 6 header on a 250 with dual chambered muffler like what came on 69 Z28's, and it sounded wicked. You can get these here: http://www.classicchambered.com/classic/sounds.html __________________ '67 C-30 Dually Pickup 6.2 Turbo Diesel, NP435 ‘72 C-10 SWB , 350 4bbl, TH350 '69 C-10 SWB , 250 L6, 3 OTT '69 GMC C3500, dump truck, 351 V6, NP435 '84 M1009 CUCV Military Blazer 67 C-30 Turbodiesel build thread http://67-72chevytrucks.com/vboard/s...d.php?t=254096 My trucks http://s226.photobucket.com/albums/d...ediafilter=all Member of the 1-Ton Club!

10-07-2007, 11:07 PM	#14
Big D Registered User Join Date: Apr 2005 Location: Dunlap, IL Posts: 308	Re: Mufflers for the 250cid Six banger? I'm running a thrush turbo on mine, It had one of those bargin 18" glass-packs on it when I got it and it sounded like a vacumn cleaner on steriods. The turbo gives it a nice throaty sound. __________________ 68 GMC 64 1/2 Mustang convert A bachelor's life is no life for a single man." - Samuel Goldwyn



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