Raising partial VIN after block is decked

[bergy]

I have heated up the pad on a decked '69 427/435 block and got the numbers to come up. It's a little risky, but if all else fails..... The factory stamping puts a stress in the metal -you get it hot to relieve the stress and the numbers come out. have a good insulating pad to place over the area after heating to allow it to cool slowly. There <span style="text-decoration: underline">IS</span> a risk of cracking. Actually, cosmetic repairs on blocks at Tonawanda MCP were done after heating to cherry red &amp; covering to slow cool. Repairs on the intake rails using this method were common. The success of this method also depends on how much the block was decked - as Kurt said. I'll say it again though - this method could result in cracks if cooling is too rapid. The good thing is that the stampings pop out permanently.

[Verne_Frantz]

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: bergy</div><div class="ubbcode-body">I have heated up the pad on a decked '69 427/435 block and got the numbers to come up. It's a little risky, but if all else fails..... The factory stamping puts a stress in the metal -you get it hot to relieve the stress and the numbers come out. have a good insulating pad to place over the area after heating to allow it to cool slowly. There <span style="text-decoration: underline">IS</span> a risk of cracking. Actually, cosmetic repairs on blocks at Tonawanda MCP were done after heating to cherry red &amp; covering to slow cool. Repairs on the intake rails using this method were common. The success of this method also depends on how much the block was decked - as Kurt said. I'll say it again though - this method could result in cracks if cooling is too rapid. The good thing is that the stampings pop out permanently. </div></div>

You can also reduce the sudden cooling and possible cracks by just reducing the flame a little at a time and fanning it around, Think of it as slowly turning down the gas burner on your stove until it as cooled slowly by itself. Glass blowers use this technique to prevent cracking between the area that was worked and the solid glass next to it.

Verne

[parsone]

Thanks for the suggestions. What do you use for a heat source? welding or cutting torch?