2.5" exhaust manifold - The 1947 - Present Chevrolet & GMC Truck Message Board Network

tomatocity · 07-05-2005, 07:05 PM

attached is a pic of a 2.5" outlet exhaust manifold. As you can see there is a bracket cast into the manifold. What would it take to cut off and grind the casting to something similar as the other end. Not perfect though close. A little paint, install 'em, and never worry about a header leak again. This manifold is $79+. The LH sells for $94+ and I don't have an idea why.

**JIMs70GMC** · 07-05-2005, 07:53 PM

I cut them off of the manifolds on my GMC (vette ramhorns) and cut one bracket off of the driver side manifold of my chevy, I used a 4.5" cut off wheel.

Rokcrln · 07-05-2005, 08:35 PM

Keep in mind these are vett. manifolds and they drop straite down. The trucks have a slight kick back to help avoid mounts and such. That being said they will work and work well. I had some on my 327 in my 71, it was a bit harder for the exhaust guy to do his job but he did it. Now I just had a set of custom headers done for my LT1 from sandersons and they are just shy of 3".

Kevin

**VetteVet** · 07-05-2005, 11:12 PM

That's the mount bracket for the ac compressor and I have one on my 74 vette. It seems like someone out there would need one and would trade for yours.

tomatocity · 07-06-2005, 01:20 AM

Quote:

Originally Posted by Rokcrln

Keep in mind these are vett. manifolds and they drop straite down. The trucks have a slight kick back to help avoid mounts and such. That being said they will work and work well. I had some on my 327 in my 71, it was a bit harder for the exhaust guy to do his job but he did it. Now I just had a set of custom headers done for my LT1 from sandersons and they are just shy of 3".

Kevin

Sandersons are very good headers and Mr. Sanderson is a vry good person. At the Oakland Roadster show, I think 1998, he gave me copper collector gaskets and a metal plate to cure the collector to exhaust tubing leakage. It worked and worked well. He did not have to do this and I was not expecting him to do anything. Good man!

70GMCer · 07-06-2005, 08:24 AM

I cut that piece off for a 62 Impala I had years back, and the only thing is that where you cut, it will be smooth and not a rough surface as the rest of the manifold

**JIMs70GMC** · 07-06-2005, 09:55 AM

The manifolds on my GMC were new castings for a 63 vette 327, left and right. Got them from GM parts direct for $86 each. I don't know of any center dump ramhorns w/ 2.5" collector that does not have the brackets for alt/AC.

nu2-72 · 07-06-2005, 12:18 PM

I cut mine off, used a file to shape, used a right angle die grinder with Scotch-Brite pads to smooth up the rest a little and then sand blasted with coarse sand to evenly matte the finish. Wiped with lacquer thinner and finished with Eastwoods manifold Cast Grey coating. They look pretty sharp.

HeavyD · 07-06-2005, 01:23 PM

Eastwood also sells a manifold smoothing kit that has some abrasive rolls to smooth out the whole manifold if you don't mind a bit of a custom look.

tomatocity · 07-06-2005, 01:24 PM

Quote:

Originally Posted by nu2-72

I cut mine off, used a file to shape, used a right angle die grinder with Scotch-Brite pads to smooth up the rest a little and then sand blasted with coarse sand to evenly matte the finish. Wiped with lacquer thinner and finished with Eastwoods manifold Cast Grey coating. They look pretty sharp.

They sound very nice. How many hours do you have in them? Any pics?

tomatocity · 07-06-2005, 01:27 PM

Quote:

Originally Posted by 70GMCer

I cut that piece off for a 62 Impala I had years back, and the only thing is that where you cut, it will be smooth and not a rough surface as the rest of the manifold

We had the same car, 62 Impala SS. I bought a 300 HP 327 with the 2.5 exhaust manifolds from the factory. Before I could build it I got an offer I could not refuse and sold all of it. Sold the SS earlier this year.

neonlarry · 07-06-2005, 02:59 PM

You can also put the manifold on the opposite bank after you do this so the ground off part is facing towards the fire wall and its even less noticable.
On some installations not all you may have to remove a little material from the motor mount stands.
Check out this post:
http://207.44.196.117/vboard/showthr...7&page=2&pp=25

nu2-72 · 07-06-2005, 03:33 PM

tomatocity, I will try to take some tonight.

nu2-72 · 07-06-2005, 09:02 PM

here is one

tomatocity · 07-07-2005, 01:18 AM

Quote:

Originally Posted by nu2-72

here is one

Looks great. Where was the bracket? Thanks for the pic.

nu2-72 · 07-07-2005, 06:54 AM

Left side of the pic. Or was it the right?
Seriously it was the left, front side of the engine.
This is the motor for my truck so I went with the 2.5" and several other upgrades. You can see the rollor rockers. Just stamped steel version but will help some. The rest of the mods are internal.

**Classic Heartbeat** · 07-07-2005, 12:09 PM

Here are some pictures of the engine in my "Garden Truck". I have the 2 1/2" Corvette manifolds on it. My truck is a 4X4 also. I ground the bosses off of both sides. WES www.ClassicHeartbeat.com

tomatocity · 07-07-2005, 02:56 PM

Quote:

Originally Posted by nu2-72

Left side of the pic. Or was it the right?
Seriously it was the left, front side of the engine.
This is the motor for my truck so I went with the 2.5" and several other upgrades. You can see the rollor rockers. Just stamped steel version but will help some. The rest of the mods are internal.

You guys are good. Thanks for the pics.

Wes you need to offer these for the less talented or too busy customer. How did you get the surface to look the same (rough)?

**Classic Heartbeat** · 07-07-2005, 03:16 PM

I cut the bosses off with my cut off wheel and then ground them with my 4 1/2" grinder.

I could grind a pair off but would have to charge about $50.00 because I have a good 1 1/2 hours into them. WES www.ClassicHeartbeat.com

nu2-72 · 07-07-2005, 04:09 PM

Same amount of time here but it is worth the work to have such a clean look.
Wes, garden truck my eye. You could eat a salad off that thing.

**Classic Heartbeat** · 07-07-2005, 04:24 PM

nu2-72, You are wright, you could eat a salad off of it.. But it realy is my "Garden Truck", See the license plate..

WES www.ClassicHeartbeat.com

tomatocity · 07-07-2005, 07:12 PM

Quote:

Originally Posted by WES

I cut the bosses off with my cut off wheel and then ground them with my 4 1/2" grinder.

I could grind a pair off but would have to charge about $50.00 because I have a good 1 1/2 hours into them. WES www.ClassicHeartbeat.com

Now I want to hit both of you up for closeup pictures so I can see what I should achieve.

Wes, you and GMCPaul really make a 67-72 owner feel inferior. And Paul doesn't list all of his trucks. If both of you lived closer together that would be a truck show in itself.

**Classic Heartbeat** · 07-07-2005, 07:43 PM

If you look at the bottom left picture, that is the end of the manifold. Just remember when cutting the boss off of it, leave lots of room to grind and smooth. You will see it realy isn't that bad. Just don't remove too much material and go easy on it. You can alway remove a little more material, but you can't put any back!!!
I don't try to make anyone feel inferior, and I'm sorry if I do. I try to educate you with my experience. If you love these trucks as much as I do, you will get there soon! WES www.ClassicHeartbeat.com

07-05-2005, 07:05 PM	#1
tomatocity Registered User Join Date: Jun 2005 Location: Sacramento CA Posts: 1,255	2.5" exhaust manifold attached is a pic of a 2.5" outlet exhaust manifold. As you can see there is a bracket cast into the manifold. What would it take to cut off and grind the casting to something similar as the other end. Not perfect though close. A little paint, install 'em, and never worry about a header leak again. This manifold is $79+. The LH sells for $94+ and I don't have an idea why. Attached Images __________________ Got bored, sold everthing. Got bored, looking for a 1960-66 C-10. Want to build my last truck.

07-05-2005, 07:53 PM	#2
JIMs70GMC user # 2756 Join Date: Jun 2001 Location: Chesapeake, Virginia Posts: 4,612	I cut them off of the manifolds on my GMC (vette ramhorns) and cut one bracket off of the driver side manifold of my chevy, I used a 4.5" cut off wheel. __________________ 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

07-05-2005, 11:12 PM	#4
VetteVet Msgt USAF Ret Join Date: Jan 2005 Location: Kalamazoo, Michigan Posts: 8,709	That's the mount bracket for the ac compressor and I have one on my 74 vette. It seems like someone out there would need one and would trade for yours. __________________ VetteVet metallic green 67 stepside 74 corvette convertible 1965 Harley sportster 1995 Harley wide glide Growing old is hell, but it beats the alternative.

07-06-2005, 08:24 AM	#6
70GMCer Senior Member Join Date: Apr 2005 Location: Joppa, Maryland Posts: 4,408	I cut that piece off for a 62 Impala I had years back, and the only thing is that where you cut, it will be smooth and not a rough surface as the rest of the manifold __________________ 1997 GMC Sierra Ext 1965 Mustang

07-06-2005, 09:55 AM	#7
JIMs70GMC user # 2756 Join Date: Jun 2001 Location: Chesapeake, Virginia Posts: 4,612	The manifolds on my GMC were new castings for a 63 vette 327, left and right. Got them from GM parts direct for $86 each. I don't know of any center dump ramhorns w/ 2.5" collector that does not have the brackets for alt/AC. __________________ 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

07-05-2005, 08:35 PM	#3
Rokcrln Senior Member Join Date: Jul 2005 Location: Winters Ca. 95694 Posts: 4,843	Keep in mind these are vett. manifolds and they drop straite down. The trucks have a slight kick back to help avoid mounts and such. That being said they will work and work well. I had some on my 327 in my 71, it was a bit harder for the exhaust guy to do his job but he did it. Now I just had a set of custom headers done for my LT1 from sandersons and they are just shy of 3". Kevin

07-06-2005, 12:18 PM	#8
nu2-72 Senior Member Join Date: Apr 2001 Location: Amazonia, Mo. USA Posts: 2,821	I cut mine off, used a file to shape, used a right angle die grinder with Scotch-Brite pads to smooth up the rest a little and then sand blasted with coarse sand to evenly matte the finish. Wiped with lacquer thinner and finished with Eastwoods manifold Cast Grey coating. They look pretty sharp. __________________ 72 3/4 4x4 350 4spd 72 3/4 4x4 350 auto 2004 Duramax Silverado 4x4 2006 Duramax Crew cab 4x4 2010 Harley Ultra Limited 2011 Harley Street Glide

07-06-2005, 01:23 PM	#9
HeavyD Senior Member Join Date: Sep 2004 Location: Wakaw, Sask, Canada Posts: 3,179	Eastwood also sells a manifold smoothing kit that has some abrasive rolls to smooth out the whole manifold if you don't mind a bit of a custom look. __________________ "You can take the man out of PA, but you can't take PA out of the man"

07-06-2005, 02:59 PM	#12
neonlarry Registered User Join Date: Feb 2002 Location: Vacaville, CA Posts: 2,746	You can also put the manifold on the opposite bank after you do this so the ground off part is facing towards the fire wall and its even less noticable. On some installations not all you may have to remove a little material from the motor mount stands. Check out this post: http://207.44.196.117/vboard/showthr...7&page=2&pp=25 __________________ 70 C/10 Light Red 350/TH350, HEI, Duals w/40 series Flows, 91 seat, LED taillights 99 Pontiac S/C GTP, SLP Ram Air hood, GMPP Konis & springs 95 Neon ACR, MP PCM, AFX UDP, 3.0 CAI

07-06-2005, 03:33 PM	#13
nu2-72 Senior Member Join Date: Apr 2001 Location: Amazonia, Mo. USA Posts: 2,821	tomatocity, I will try to take some tonight. __________________ 72 3/4 4x4 350 4spd 72 3/4 4x4 350 auto 2004 Duramax Silverado 4x4 2006 Duramax Crew cab 4x4 2010 Harley Ultra Limited 2011 Harley Street Glide

07-06-2005, 09:02 PM	#14
nu2-72 Senior Member Join Date: Apr 2001 Location: Amazonia, Mo. USA Posts: 2,821	Hope this works here is one Attached Images __________________ 72 3/4 4x4 350 4spd 72 3/4 4x4 350 auto 2004 Duramax Silverado 4x4 2006 Duramax Crew cab 4x4 2010 Harley Ultra Limited 2011 Harley Street Glide

07-07-2005, 06:54 AM	#16
nu2-72 Senior Member Join Date: Apr 2001 Location: Amazonia, Mo. USA Posts: 2,821	Left side of the pic. Or was it the right? Seriously it was the left, front side of the engine. This is the motor for my truck so I went with the 2.5" and several other upgrades. You can see the rollor rockers. Just stamped steel version but will help some. The rest of the mods are internal. __________________ 72 3/4 4x4 350 4spd 72 3/4 4x4 350 auto 2004 Duramax Silverado 4x4 2006 Duramax Crew cab 4x4 2010 Harley Ultra Limited 2011 Harley Street Glide

07-07-2005, 12:09 PM	#17
Classic Heartbeat Project Junkie! Fishing Poor!! Join Date: Dec 1999 Location: Olympia,Wa. 98512 Posts: 10,770	Here are some pictures of the engine in my "Garden Truck". I have the 2 1/2" Corvette manifolds on it. My truck is a 4X4 also. I ground the bosses off of both sides. WES www.ClassicHeartbeat.com __________________ On-line catolog Classic Heartbeat Pickup Parts WEHEPP@comcast.net Call us Toll Free (888) 338-2502 Like Us on Facebook No appointment necessary. 72 BB Chevy Custom Deluxe / Custom Camper 67 I-6 (Soon to be 5.7 LS1) Panel 68 BB Chevy Short Bed 72 6.0 LQ9 Short Bed Chevy 4X4 Olympia's fastest growing truck parts supplier. Olympia's home for Wayward Chevys Last edited by Classic Heartbeat; 10-04-2007 at 07:34 PM.

07-07-2005, 03:16 PM	#19
Classic Heartbeat Project Junkie! Fishing Poor!! Join Date: Dec 1999 Location: Olympia,Wa. 98512 Posts: 10,770	I cut the bosses off with my cut off wheel and then ground them with my 4 1/2" grinder. I could grind a pair off but would have to charge about $50.00 because I have a good 1 1/2 hours into them. WES www.ClassicHeartbeat.com __________________ On-line catolog Classic Heartbeat Pickup Parts WEHEPP@comcast.net Call us Toll Free (888) 338-2502 Like Us on Facebook No appointment necessary. 72 BB Chevy Custom Deluxe / Custom Camper 67 I-6 (Soon to be 5.7 LS1) Panel 68 BB Chevy Short Bed 72 6.0 LQ9 Short Bed Chevy 4X4 Olympia's fastest growing truck parts supplier. Olympia's home for Wayward Chevys

07-07-2005, 04:09 PM	#20
nu2-72 Senior Member Join Date: Apr 2001 Location: Amazonia, Mo. USA Posts: 2,821	Same amount of time here but it is worth the work to have such a clean look. Wes, garden truck my eye. You could eat a salad off that thing. __________________ 72 3/4 4x4 350 4spd 72 3/4 4x4 350 auto 2004 Duramax Silverado 4x4 2006 Duramax Crew cab 4x4 2010 Harley Ultra Limited 2011 Harley Street Glide



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07-07-2005, 04:24 PM	#21
Classic Heartbeat Project Junkie! Fishing Poor!! Join Date: Dec 1999 Location: Olympia,Wa. 98512 Posts: 10,770	nu2-72, You are wright, you could eat a salad off of it.. But it realy is my "Garden Truck", See the license plate.. WES www.ClassicHeartbeat.com __________________ On-line catolog Classic Heartbeat Pickup Parts WEHEPP@comcast.net Call us Toll Free (888) 338-2502 Like Us on Facebook No appointment necessary. 72 BB Chevy Custom Deluxe / Custom Camper 67 I-6 (Soon to be 5.7 LS1) Panel 68 BB Chevy Short Bed 72 6.0 LQ9 Short Bed Chevy 4X4 Olympia's fastest growing truck parts supplier. Olympia's home for Wayward Chevys Last edited by Classic Heartbeat; 10-04-2007 at 07:34 PM.

07-07-2005, 07:43 PM	#23
Classic Heartbeat Project Junkie! Fishing Poor!! Join Date: Dec 1999 Location: Olympia,Wa. 98512 Posts: 10,770	If you look at the bottom left picture, that is the end of the manifold. Just remember when cutting the boss off of it, leave lots of room to grind and smooth. You will see it realy isn't that bad. Just don't remove too much material and go easy on it. You can alway remove a little more material, but you can't put any back!!! I don't try to make anyone feel inferior, and I'm sorry if I do. I try to educate you with my experience. If you love these trucks as much as I do, you will get there soon! WES www.ClassicHeartbeat.com __________________ On-line catolog Classic Heartbeat Pickup Parts WEHEPP@comcast.net Call us Toll Free (888) 338-2502 Like Us on Facebook No appointment necessary. 72 BB Chevy Custom Deluxe / Custom Camper 67 I-6 (Soon to be 5.7 LS1) Panel 68 BB Chevy Short Bed 72 6.0 LQ9 Short Bed Chevy 4X4 Olympia's fastest growing truck parts supplier. Olympia's home for Wayward Chevys

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