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Old 03-19-2006, 02:06 PM
ezobens ezobens is offline
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400 SBC Steam Hole Crack

This is turning out to be the rebuild from hell-
I am getting ready to assemble my 400 SBC and was inspecting the block after it came back from the shop for a .040 overbore and some mild decking. I was a little ticked to find that I have a hairline crack in the upper steam hole between cyls 3 and 5. This hairline crack runs from the upper steam hole to the bolt hole directly above it (about 1/8"-3/16" long). I cannot tell how far down the holes this crack actually goes.
First I'm a little frustrated at the shop not noticing or notifying me of the crack and second, where do I go from here?
The block otherwise looks to be almost perfect- The bores, crank and rods were all standard size when I bought the motor and it supposedly ran before being pulled from the seller's truck. I did notice that one of the previous owners did have the heads off at one time- And while it had the correct 400 heads, the clown used standard SBC head gaskets that didn't have the steam holes so the center cylinders on both side looked like they ran hotter than the others. There are NO cracks in the bore area and I can't see any other cracks in the steam holes other than this one on the left bank.
What are my options?
I would be most upset if I had to junk this block just for this- Can I have the shop weld the hole/crack and re-drill the hole and the block?
Any advice would be greatly appreciated!
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