Thread: destroyed my cyl head today

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today, I was porting my head, just finishing up, been coming along nicely until I cut through 1 exhaust runner, and noticed another was almost all the way thru, and with a little poking, it was thru. so I can ither have it welded or buy a diffrent head, so I called around and found a place that might have 1. I asked for a '78 Head which would be better flowing, and have hardened seats arleady, so I wouldn't need that done to the head, like I would this 1.

Well like they say " POOP" happens
I did that to a hemi once but that was when you could buy them for a few bucks at any yard around.

teacher said I could possibly epoxy up the goof's, but for me, it's too chancey, being it's going to be a turbo motor, and if some epoxy lets loose and blows into the turbo, it will destroy the turbo. welding is the only viable option, and we can't weld cast iron, I'd have to send it out.

Cast iron is easy to weld, if you have access to an arc welder you can do it, they sell special rods at the welding shop, just put the head in the oven on broil for a couple of hours, to preheat it, get it nice and hot,well over 500 if possible, then hit it with the rod, do your welding, then put it back in the oven, and slowly let it cool, or you can put it in a container with oil to let it slowly cool, the main key is in your preheat and postheat, and hey if you mess it up you did not screw up a good part, your already in the hole, so at least you get some practice

If your worried about how to tell when the head is hot enough the welding supply place should sell heat sticks. they melt when you touch them to surface at the temp. you buy it for.

Originally Posted by hotroddaddy

Cast iron is easy to weld, if you have access to an arc welder you can do it, they sell special rods at the welding shop, just put the head in the oven on broil for a couple of hours, to preheat it, get it nice and hot,well over 500 if possible, then hit it with the rod, do your welding, then put it back in the oven, and slowly let it cool, or you can put it in a container with oil to let it slowly cool, the main key is in your preheat and postheat, and hey if you mess it up you did not screw up a good part, your already in the hole, so at least you get some practice

sounds good. if I end up buying a later head, I'll do that and see what I can do at home, we don't have an oven in the shop.

Good thought Charlie, i completely forgot about those

We did it at the race car shop with a regular house oven, the misses might get a little mad though, i know mine would, thats why i have an old one in the garage

Im guessing you need a head for the chevy right, if not i have a couple of ford six heads your welcome to

Originally Posted by hotroddaddy

We did it at the race car shop with a regular house oven, the misses might get a little mad though, i know mine would, thats why i have an old one in the garage

Im guessing you need a head for the chevy right, if not i have a couple of ford six heads your welcome to

yep, just asked my mom, got a big fat NO. my grandfather has an old electric oven he pulled out of an old trailer that I might be able to use.

Originally Posted by hotroddaddy

Im guessing you need a head for the chevy right, if not i have a couple of ford six heads your welcome to

no actully, it was my 200 Ford's head that I screwed up.

Electric oven is much better it has a more even heat. Works better when baking too.

Let me dig through my stuff, i should have a 200 head still, unfortanatly i just gave my falcon and all its parts away two weeks ago, but if i have one its yours if you want to pay shipping

Originally Posted by hotroddaddy

Let me dig through my stuff, i should have a 200 head still, unfortanatly i just gave my falcon and all its parts away two weeks ago, but if i have one its yours if you want to pay shipping

cool, let me know.

you do not have to get it that hot use 99 nickel weld mold rod 700or702 look here www.weldmold.com i warm it up with a torch 400 F or so use a heat stick and weld bit and peen let it cool slow i have fixed many blocks with this rod it has work very good for me

Pat
just a question about the 700 or 702 rod. How does it machine?? Is it like the iron?? Can you drill and tap in the repaired area ??