Before
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After
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A week and 200 bux Chad Golen fixed my afr's how does it look?

 

Repair looks good. If it were my head I would have them make sure its still flat though, take off .001 and make sure its clean across the head. Also make sure to get all those little shavings out of it! Good luck!

 

Thanks, he said hes finishing up on it today so I'm sure cleaning is the last step. I'll ask him if he milled them too. Going to get the engine today hopefully it'll be done

 

Make sure the Valve Job gets redone, with the same angles and widths as the other cylinders. With that much welding on the head he needs to stress relieve the head and then mill it. I've seen heads that were fixed(welded) then milled and later on were warped because the head was not stress relieved.... it can cause seriously cylinder sealing problems if you don't stress relieve the head.

Bret

 

Bret what do you suggest for stress relieving, clamp to a steel plate and bake it for 5 or 6 hours?

 

You can do a 2 hour bake at 285-300° and then turn the oven off and just let it cool or you can run a air hammer/chisel with a blunt end up and down the deck where it was welded.... either way you should cut the deck surface of the head after that.

Bret

 

I asked him if he "stress relieved" the head, and he wasn't quite sure what it meant. I think he said he took 5 thousands off, and did a valve job. As far as baking it I dont think he did but I could be wrong. He said not to worry about it.

 

Dave,

I don't know how common it is, but it's a trick I learned from talking to the guys at the Engine Masters contest. They add a lot of weld to the chambers of the heads to get them smaller so I just asked them about the process they go thru to do that. After talking with our local heat treater, who is actually very good they gave us the baking idea for stress reliving the heads rather than doing it with a air hammer/chisel.

Bret

 

Thanks for the reply. Here at school they taught a slow bake clamped to a steel plate, but many times real world scenerios are done differently

 

With aluminum, depending on the extent of the weld, I do a slow bake/cooldown on a flat plate. With cast I do the peen method, like you said a blunt ended air hammer all over the area is a must to keep it from cracking again due to the metal tightening up where it was welded.