The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - 79 250 integrated head exhaust manifold crack

Ziegelsteinfaust · 01-25-2020, 10:11 PM

Not sure. I do know you have to drill holes at the end of the cracks, and open the crack up with a grinder to allow penetration.

Also it depends on how are where the crack is situated.

I "repaired" a Toyota manifold one time with a regular mig welder long enough to trade the truck in. It wasn't so bad, and you can cut a arc welding stick down to help with the job.

Also I heard preheating the manifold or cast metal helps, and keep heat on it as it cools. I used MAP gas.

01-25-2020, 10:11 PM	#4
Ziegelsteinfaust Registered User Join Date: Dec 2012 Location: Temple City Posts: 3,560	Re: 79 250 integrated head exhaust manifold crack Not sure. I do know you have to drill holes at the end of the cracks, and open the crack up with a grinder to allow penetration. Also it depends on how are where the crack is situated. I "repaired" a Toyota manifold one time with a regular mig welder long enough to trade the truck in. It wasn't so bad, and you can cut a arc welding stick down to help with the job. Also I heard preheating the manifold or cast metal helps, and keep heat on it as it cools. I used MAP gas.