best headers for blazers? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Blizz · 07-25-2010, 03:27 AM

i know with my tahoe shorties don't do squat for it so eventually i'll do long tubes on it but is the same true for our blazers? right now i just have the ram horn manifold.

Critter · 07-25-2010, 09:08 AM

This has been debated over and over and over especially on the truck side of the forum. I have a negative opinion about headers on a street truck but I will try to keep it mostly to myself. I do want to let you know that these stock ramhorn manifolds are not all that bad, they flow pretty good actually. You can also get the slightly larger diameter "Corvette ramhorns" new for fairly cheap. Some will even argue they flow BETTER than your regular run of the mill header. Either way don't expect any of these options to show you a drastic change in performance on a street vehicle.

Blizz · 07-25-2010, 01:27 PM

Good info there Critter. Yeah I'm not all that sold on them anyways, I was just wondering if it was something I should do while I have this thing pulled out. I guess I'll just stick with what I have.

Mike C · 07-25-2010, 09:08 PM

I'm not a big header fan for a truck either. But if you are going to do it, Heddman is the only one I know made a header that would work with the stock clutch linkage if you have a 4x4.

Having looked at quite a few 63-82 Corvette Headers, it seems that they might work fine for a 4x4 67-72, but this is just eye balling, haven't tested it.

If you are making a max effort horsepower motor, then the full length header is a must have. Otherwise if you want a nice free-flowing street exhaust, the 2 1/2" exit Corvette rams horns and a full length 2 1/2" exhaust is a great setup. I am particularly fond of the Dynomax Hemi Turbos as they are really quiet at idle and cruise but sound great when you are in it.

AJs72K5 · 07-25-2010, 09:50 PM

One of the only headers specifically made to clear our trucks...SBC or BBC. Spendy, but not out of line with what you'd spend on a set of Doug Thorleys.

Group buy thread --> LINK

Group buy announcement link with pics --> LINK

Original header thread with more pics --> LINK

propanemudtruck · 07-27-2010, 01:04 PM

I'll agree that headers aren't all they're cracked up to be for a street vehicle, but oh the sound! I love a good exhaust system, although most of my own are rusted out, falling apart, broken studs and dragging half the time.... Gotta love Michigan!

BLUE THUNDER · 07-27-2010, 10:51 PM

I got a set of headman long tubes and they fit great. So far so good.

Cap'n Hook · 07-28-2010, 07:27 PM

I agree on the sound, with long tubes, you can't go wrong. But if I were gonna do it (and eventually I will), I'd go with the Vette ram horns with rear exit for flow and for nostalgia.

**KevsClassics** · 07-29-2010, 01:02 AM

Quote:

Originally Posted by AJs72K5

One of the only headers specifically made to clear our trucks...SBC or BBC. Spendy, but not out of line with what you'd spend on a set of Doug Thorleys.

Group buy thread --> LINK

Group buy announcement link with pics --> LINK

Original header thread with more pics --> LINK

I have had Thorley Tri Ys on my Blazer for 14 years. Never had no probs. Still look, sound & perform like new/

63chevyll · 07-29-2010, 01:21 AM

Doug Thorleys are hand down the best header i have ever run on chevy trucks, Ive used some cheapys that were ok, and did the job fine, but in the long run they almost never hold up over the years.

they are pricy, but if your gonna keep it for a long time they are worth the investemnt.

I had an 84 blazer with stock 305 manifolds, stock cat and stock muffler, with a crate 350,
a 2.5 collector with 2.25 pipes and flowmasters (cuz i had em)

I will use them again,

I gained 3 mpgs in town with thorleys, and a nice dual exhaust system. No Joke

AJs72K5 · 07-30-2010, 06:12 PM

Agreed. The Doug Thorley Tri-Ys are a great header. The Tri-Y design builds great torque on the bottom end. However, on the top end, beginning at about 4000 rpm, horsepower and torque begin to fall off the chart considerably.

Firebirdjones · 07-31-2010, 08:08 PM

Quote:

Originally Posted by BLUE THUNDER

I got a set of headman long tubes and they fit great. So far so good.

Same here, great fit, easy plug changes, etc....I won't run anything but long tube headers on all my vehicles, daily driven or not.

bigeasycigars · 08-02-2010, 11:09 PM

Quote:

Originally Posted by Blizz

i know with my tahoe shorties don't do squat for it so eventually i'll do long tubes on it but is the same true for our blazers? right now i just have the ram horn manifold.

Check this thread...

http://67-72chevytrucks.com/vboard/s...d.php?t=404828

07-25-2010, 03:27 AM	#1
Blizz Registered User Join Date: May 2006 Location: San Antonio, Texas Posts: 372	best headers for blazers? i know with my tahoe shorties don't do squat for it so eventually i'll do long tubes on it but is the same true for our blazers? right now i just have the ram horn manifold. __________________ '72 K5 CST Blazer 4x4 in perpetual progress '96 2dr Tahoe 4x4 daily driver, Black Bear Performance tune, 285-75-16 Nitto Grapplers, Magnaflow muffler, K&N Air filter, Bilstein Shocks.........E-fan, DT Tri Y or Pacesetter LTs coming soon

07-25-2010, 09:08 AM	#2
Critter Future TOTM Winner Join Date: Aug 2006 Location: Bulverde, TX Posts: 2,692	Re: best headers for blazers? This has been debated over and over and over especially on the truck side of the forum. I have a negative opinion about headers on a street truck but I will try to keep it mostly to myself. I do want to let you know that these stock ramhorn manifolds are not all that bad, they flow pretty good actually. You can also get the slightly larger diameter "Corvette ramhorns" new for fairly cheap. Some will even argue they flow BETTER than your regular run of the mill header. Either way don't expect any of these options to show you a drastic change in performance on a street vehicle. __________________ 72 Chevy CST K5 HIGHLANDER BLAZER Getting a 6.0,NV4500,NP205,14BFF (Currently laying all over the place in little pieces) 72 Chevy swb step-side "LS" 6.0 Here's a build thread of sorts 2002 HD2500 Crew Cab, 8.1L Allison 4x4 Daily Driver Check it out www.lsdyno.com Last edited by Critter; 07-25-2010 at 09:09 AM.

07-25-2010, 01:27 PM	#3
Blizz Registered User Join Date: May 2006 Location: San Antonio, Texas Posts: 372	Re: best headers for blazers? Good info there Critter. Yeah I'm not all that sold on them anyways, I was just wondering if it was something I should do while I have this thing pulled out. I guess I'll just stick with what I have. __________________ '72 K5 CST Blazer 4x4 in perpetual progress '96 2dr Tahoe 4x4 daily driver, Black Bear Performance tune, 285-75-16 Nitto Grapplers, Magnaflow muffler, K&N Air filter, Bilstein Shocks.........E-fan, DT Tri Y or Pacesetter LTs coming soon

07-25-2010, 09:08 PM	#4
Mike C Registered User Join Date: Dec 1999 Location: Austin, TX, USA Posts: 7,715	Re: best headers for blazers? I'm not a big header fan for a truck either. But if you are going to do it, Heddman is the only one I know made a header that would work with the stock clutch linkage if you have a 4x4. Having looked at quite a few 63-82 Corvette Headers, it seems that they might work fine for a 4x4 67-72, but this is just eye balling, haven't tested it. If you are making a max effort horsepower motor, then the full length header is a must have. Otherwise if you want a nice free-flowing street exhaust, the 2 1/2" exit Corvette rams horns and a full length 2 1/2" exhaust is a great setup. I am particularly fond of the Dynomax Hemi Turbos as they are really quiet at idle and cruise but sound great when you are in it. __________________ 44 Willys MB 52 M38A1 64 Corvette Coupe 68 Camaro 'vert LT1 & TH700 69 Z/28 355 12.6's @110 69 Chevy Short Step 4 1/2"/7" drop 72 Jimmy 4WD 4spd 4" & 35's 02 GMC 2500HD 4x4 Duramax

07-25-2010, 09:50 PM	#5
AJs72K5 Registered User Join Date: Nov 2007 Location: South Tx Posts: 1,083	Re: best headers for blazers? One of the only headers specifically made to clear our trucks...SBC or BBC. Spendy, but not out of line with what you'd spend on a set of Doug Thorleys. Group buy thread --> LINK Group buy announcement link with pics --> LINK Original header thread with more pics --> LINK __________________ - AJ Gray Matter Build - 1972 K5 with some stuff Last edited by AJs72K5; 07-28-2010 at 07:47 PM.

07-27-2010, 01:04 PM	#6
propanemudtruck Local Redneck Authority Join Date: Mar 2009 Location: Grand Rapids, MI Posts: 584	Re: best headers for blazers? I'll agree that headers aren't all they're cracked up to be for a street vehicle, but oh the sound! I love a good exhaust system, although most of my own are rusted out, falling apart, broken studs and dragging half the time.... Gotta love Michigan! __________________ -Kevin four on the floor feel the beat in your soul movin to the rhythym pumpin til ya cant take no more dance if you want to do what you came to you cant ignore the feeling of that four on the floor

07-27-2010, 10:51 PM	#7
BLUE THUNDER Registered User Join Date: May 2007 Location: San Antonio Posts: 993	Re: best headers for blazers? I got a set of headman long tubes and they fit great. So far so good.

07-28-2010, 07:27 PM	#8
Cap'n Hook Workin to live... Join Date: Jun 2003 Location: Texas Hill Country Posts: 261	Re: best headers for blazers? I agree on the sound, with long tubes, you can't go wrong. But if I were gonna do it (and eventually I will), I'd go with the Vette ram horns with rear exit for flow and for nostalgia. __________________ Jason

07-29-2010, 01:21 AM	#10
63chevyll gets board easy....... Join Date: Mar 2009 Location: Colorado Springs Posts: 717	Re: best headers for blazers? Doug Thorleys are hand down the best header i have ever run on chevy trucks, Ive used some cheapys that were ok, and did the job fine, but in the long run they almost never hold up over the years. they are pricy, but if your gonna keep it for a long time they are worth the investemnt. I had an 84 blazer with stock 305 manifolds, stock cat and stock muffler, with a crate 350, a 2.5 collector with 2.25 pipes and flowmasters (cuz i had em) I will use them again, I gained 3 mpgs in town with thorleys, and a nice dual exhaust system. No Joke

07-30-2010, 06:12 PM	#11
AJs72K5 Registered User Join Date: Nov 2007 Location: South Tx Posts: 1,083	Re: best headers for blazers? Agreed. The Doug Thorley Tri-Ys are a great header. The Tri-Y design builds great torque on the bottom end. However, on the top end, beginning at about 4000 rpm, horsepower and torque begin to fall off the chart considerably. __________________ - AJ Gray Matter Build - 1972 K5 with some stuff



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