help with the exhaust manifold - The 1947 - Present Chevrolet & GMC Truck Message Board Network

vazquezguitarras · 08-05-2011, 08:09 PM

Hi guys, I need help with my exaust manifold. It is of cast iron and it broke. It can not be weld, I want to know if you can make any modification to the intake manifold Because they are joined. My truck has a 250 inline six engine. Thank you very much for any help!

Johnny Merder · 08-05-2011, 09:18 PM

There are a lot of old wives tales when it comes to this, I welded my 6.6 drivers side with a mig welder and it is fine. it depend how much carbon has been absorbed into the metal as to how well it welds. it is worth a try.

vazquezguitarras · 08-05-2011, 09:32 PM

thanks!

vazquezguitarras · 08-05-2011, 09:49 PM

Quote:

Originally Posted by Johnny Merder

There are a lot of old wives tales when it comes to this, I welded my 6.6 drivers side with a mig welder and it is fine. it depend how much carbon has been absorbed into the metal as to how well it welds. it is worth a try.

Thank you very much I will consider.

motornut · 08-05-2011, 09:59 PM

i've seen them weld v6s or v8s tho
your lucky it's out!
drill small holes at the ends to unstress it keep it from getting worse/longer first
then a cutoff to grind in a small clean groove
lookin but can't see your crack here

rayfinseats · 08-06-2011, 12:36 AM

You CAN weld cast iron with arc welder. Must use stainless steel (nickel) welding rod. Can also braze with torch but must be red hot at all times during welding process. I would NOT recommend mig. I think you can use low-hydrogen rod too but not sure about that. Ask welding supply place.

vazquezguitarras · 08-06-2011, 09:57 AM

Quote:

Originally Posted by rayfinseats

You CAN weld cast iron with arc welder. Must use stainless steel (nickel) welding rod. Can also braze with torch but must be red hot at all times during welding process. I would NOT recommend mig. I think you can use low-hydrogen rod too but not sure about that. Ask welding supply place.

Thank you very much, your advice is helpful!

vazquezguitarras · 08-06-2011, 12:42 PM

Quote:

Originally Posted by motornut

i've seen them weld v6s or v8s tho
your lucky it's out!
drill small holes at the ends to unstress it keep it from getting worse/longer first
then a cutoff to grind in a small clean groove
lookin but can't see your crack here

Thank you very much for your help!

08-05-2011, 08:09 PM	#1
vazquezguitarras Registered User Join Date: May 2011 Location: Buenos Aires-Argentina Posts: 87	help with the exhaust manifold Hi guys, I need help with my exaust manifold. It is of cast iron and it broke. It can not be weld, I want to know if you can make any modification to the intake manifold Because they are joined. My truck has a 250 inline six engine. Thank you very much for any help! Attached Images

08-05-2011, 09:18 PM	#2
Johnny Merder Registered User Join Date: Jun 2011 Location: Jasper, In Posts: 109	Re: help with the exhaust manifold There are a lot of old wives tales when it comes to this, I welded my 6.6 drivers side with a mig welder and it is fine. it depend how much carbon has been absorbed into the metal as to how well it welds. it is worth a try.

08-05-2011, 09:32 PM	#3
vazquezguitarras Registered User Join Date: May 2011 Location: Buenos Aires-Argentina Posts: 87	Re: help with the exhaust manifold thanks! Last edited by vazquezguitarras; 08-05-2011 at 09:56 PM.

08-05-2011, 09:59 PM	#5
motornut 78K & 79C Jimmys Join Date: Nov 2009 Location: Ottawa Ont CANADA Posts: 7,901	Re: help with the exhaust manifold i've seen them weld v6s or v8s tho your lucky it's out! drill small holes at the ends to unstress it keep it from getting worse/longer first then a cutoff to grind in a small clean groove lookin but can't see your crack here __________________ John 1978 GMCJimmy4X4-350/203 1979 GMCJimmy4X2-305/350

08-06-2011, 12:36 AM	#6
rayfinseats Registered User Join Date: Dec 2010 Location: sioux city, iowa Posts: 619	Re: help with the exhaust manifold You CAN weld cast iron with arc welder. Must use stainless steel (nickel) welding rod. Can also braze with torch but must be red hot at all times during welding process. I would NOT recommend mig. I think you can use low-hydrogen rod too but not sure about that. Ask welding supply place.



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