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We like to use 100%Argon.There are a veriaty of rods if you preferr stick welding.What rod depends on the nickle content of the cast iron.What ever method you use peen each weld application as you weld.I don't suggest any novice take on this type of welding you can ruin parts very easy and create a unrepairable mess.

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the welding repair of both block and head worked fine thanks to y'all for your advice

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Glad it worked out for you.

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the welding repair of both block and head worked fine thanks to y'all for your advice

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Glad it worked out for you.

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Thanks for letting us know your block picture look exactly like my 440 block and max wedge head did, sickening when it happens It's all fixable

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The last two that I repaired I tigged. My stick welding skills are slowly eroding since I retired from Millwright work 3 years ago. In my shop I either grab the mig or tig. Check out this link if you are going with stick. I used a 3/32 rod. Like Bob said protect surrounding areas from splatter. I use fiberglass cloth and a product called kayo-wool. Keep covered to let it cool slowly after the repair is done. Some guys want to make a simple repair into a project.
http://www.messerwelding.com/Product%20PDFs/by%20part/MG%20765.pdf

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There is a new 55 wire for mig welding cast.

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What gas do they use Bob?

These guys would crap if they saw what we did back in 1985 the week the bad tornadoes came thru. I had a guy weld the deck of my 440 and a head between 3-5 and I filed it flat with a file. Was back racing 2 days later.

A man's gotta do what a man gotta do.

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I found the block I was talking about above (1985) so I too k picture in case this post came up again. This block was stick welded in the car and he didn't believe me when I said I would take my time and file it down after he welded it. When I came to pick up the car the next day he had it all filed down and ready to go. He couldn't believe anyone could get it filed flat that way so he gave it a try. Instead of 125 dollars for welding the block and head he would only take 100 dollars cause he said he learned something. He did accept some nickle rod I offered. Hurt one weekend, racing the next weekend. I used this block for a few years and another member just bought it to put in his street car hopefully to be out this summer.