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Old 11-08-2010, 04:10 PM
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Cracked steam hole going to bolt hole

i know you guys are probably getting tired of me considering all the problems i'm having. well i pulled the head off my 400sbc because it is cracked by the valves. when i got to looking at the block the steam hole between the siamiesed bores is cracked to the bolt hole. i have read that this is okay, but i don't know about mine because you can catch your nail on the crack because one side is raised.
-_ i know this is an exageration, but to just give you an idea about what i'm saying. is this okay or could i somehow take it down flat with out having it reasurfaced?

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Old 11-08-2010, 05:25 PM
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This can be repaired by any competent shop. The steam hole is drilled oversize. A tapered plug (Iron stitch type) is installed then the steam hole is re-drilled. A white sealer (www.Goodson.com, sold as block seal)is worked into crack. Let cure. The block can be re-faced by hand. Use a very sharp (new) 6" file. Tape off the area around the cylinders. Then carefully file the high spots around the hole and head bolt threads. Seal head bolt well when re-installing head.

I have been using this method since the eighties and have had no problems with it.
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Old 11-08-2010, 05:27 PM
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Quote:
Originally Posted by BOBCRMAN@aol.com
This can be repaired by any competent shop. The steam hole is drilled oversize. A tapered plug (Iron stitch type) is installed then the steam hole is re-drilled. A white sealer (www.Goodson.com, sold as block seal)is worked into crack. Let cure. The block can be re-faced by hand. Use a very sharp (new) 6" file. Tape off the area around the cylinders. Then carefully file the high spots around the hole and head bolt threads. Seal head bolt well when re-installing head.

I have been using this method since the eighties and have had no problems with it.
Awesome thanks! i cant find it on the website.

Last edited by projectman69; 11-08-2010 at 05:34 PM.
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Old 11-09-2010, 03:04 PM
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Quote:
Originally Posted by projectman69
Awesome thanks! i cant find it on the website.
CPS Seal All Polymer Sealer: http://www.goodson.com/store/templat...l.php?IID=5928

If you finish the surface by hand w/a file, get a BIG mill bastard- it'll allow you to stay flatter to the surface than a narrow, thin file.
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Old 11-10-2010, 06:54 AM
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Quote:
Originally Posted by cobalt327
CPS Seal All Polymer Sealer: http://www.goodson.com/store/templat...l.php?IID=5928

If you finish the surface by hand w/a file, get a BIG mill bastard- it'll allow you to stay flatter to the surface than a narrow, thin file.
Thanx i got it now cobalt.
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