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Old 02-22-2006, 02:08 PM
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welding cast iron?????

Ok, I know this is prolly not the best idea, but I would like to save this block.

some young boy's my son races with had this engine in a camero, the car ran good, well I guess the boy's didnt know about anitfreeze and the block cracked. they pulled the engine at my house and replaced it with a bbc.
the engine was left in my garage as trash. well one mans trash is another mans treasure!!! the engine had a scat stroker crank, lunati rods, forged flat tops, SCORE!!!!!!!

the block is cracked in the lifter valley high on the wall about 2 inches from the deck, it also cracked on the outside about 2 inches from the deck. the block is an 010 block, stamped 010 020 in the timing chain area.

can this block be welded, should it be welded or just trash it and use another block?
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Old 02-22-2006, 02:11 PM
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Do you have a boat? It would make a great anchor.
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Old 02-22-2006, 02:12 PM
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Get another block..and give thanks for what you did recieve in that deal..

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Old 02-22-2006, 02:43 PM
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how bad is it.they fix blocks just like they do heads.http://www.castironweldingrepairs.co.uk/i did a search for repairing engine blocks and cylinder heads by welding.this is the first thing that popped up.
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Old 02-22-2006, 03:08 PM
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the crack is about 5 inches long and just a hair line crack.
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Old 02-22-2006, 03:22 PM
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i'd do some checking in your area and see if you can find someone within driving distance to take it to.that doesn't sound very bad to me for a street engine.judging by the pictures of the mega damage to some of the engines and tranny's on the welding site your little crack shouldn't be a problem.punch in gas fusion welding for your area and see what you get.

Last edited by GoneNova/406; 02-22-2006 at 03:33 PM.
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Old 02-22-2006, 03:27 PM
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take it to a machine shop & have them look it over. i wouldn't be afraid of having it welded. brazed or stick welded either one would work, people do it all the time to the older heads & blocks that can't be found. i seen in hot rod magazine where this one guy welded to 350 blocks together to make a v-16. it made oner 700 horsepower & it didn't leak.

however, it might be just as cheap to get another block done up. have it priced & go from there.
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Old 02-22-2006, 03:32 PM
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I would get another block its not worth putting a band-aid on it that might spring a leak at least opportune time. Those blocks are a dime a dozen.
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Old 02-22-2006, 04:15 PM
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I would tend to agree with everyone else on this-replace the block unless it is something really special- (did you say this was a small block 350?). If you are dead set in doing this, I might know of a place in Santa Fe that can help-if they can't, I know a place in eastern Colorado if you are interested in having someone do it for you (they "stitch" the Block)-
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Old 02-22-2006, 04:20 PM
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I live in Artesia,nm, oil field country, I called around and found a guy that does just this, welds cast iron in the oil field, i discribed it to him, he says "no problem" he has done this a number of times and as long as it is not in a hard to reach place it will not be a problem. says he will come by the house and do it there for $30.00. for that kinda money I'll take the chance. I'll let you folks know how it turns out, thanks for all the in put in this matter. looks like it's about fifty fifty to weld or not to weld.


If a can remember I'll snap some pic's and post before and after.
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Old 02-22-2006, 06:29 PM
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There is only one real way to weld cast iron, and that is to gas weld it, with cast filler rod. Some brazing rods have the same expansion rate as cast iron and they can be used also.

The block should be slowly pre-heated to 1200 degrees before it's welded, and must be kept hot while it is welded. This is an art form that cannot be done in one day. It should be done by a professional. The base metal of the block is melted and filler rod is added. Once the repair is made, the block is cooled slowly to keep the repair from cracking.

There is another method of repair now, and it is a lower preheat temp (700 deg) and the welding is done with a powdered metal. This process uses less intense heat and the filler material is melted before it hits the repair area, causing less stress to the iron.

Cast iron is a very stable material. The area that you heat will expand, but the surrounding areas, if they are not pre-heated will not expand, causing a stress in the material and forming a crack between the area that was heated, and the area that was not heated.

This is why arc welding on cast iron is not a good deal, unless it's on corners or ears like an exhaust manifold, etc.

A good alternative is to have the crack "stitched" with the locknstitch process.

I use it alot and it works well if you know what you are doing.
excellent website .

You're block can be fixed for a price. If you want to try and stitch it yourself, you'll spend about $200.00 on a basic stitching kit.


Brian
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Old 02-22-2006, 06:48 PM
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You could also have it furnace brazed,but much cheaper to just replace it,like most others here say.

I wouldn't screw around with a cracked block.
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Old 02-22-2006, 08:48 PM
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What is the heat from the welding going to do to the cylinder walls. If they go out of round and won't seal. Then you have a welded boat anchor. I would find another block have the machine work done and swap the parts. Think of the oil, antifreeze, gaskets etc that will be wasted and the work to install it in a car to find out it does leak or the cylinders are so far out of round that is does not have good compression.

Do it right and do it right the first time. You will be time and money ahead.
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Old 02-23-2006, 03:51 PM
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i had a 2 bolt block & a 4 bolt block. the 2 bolt was busted just as you said your's is. my engine builder tried to get me to just braze the 2 bolt block & run it. it would have been cheaper than machining the 4 bolt block i had, but i just had to have the 4 bolt block.

as long as it's done right it will be fine.
how's the guy your getting to fix it going to fix it? stick weld or braze? i would trust a braze for a cheap fix. less of a chance of screwing it up.
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Old 02-23-2006, 04:10 PM
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for the cost of fixing the block you'd be quite a bit towards a junkyard block checked and machined.
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