Hairline cracks in SC block

Zach from TX · Jan 30, 2013

Started cleaning on the block getting ready to maybe set head on and I found a couple of cracks in the block of my SC. One picture shows a crack from #1 sleeve to head stud to #2 sleeve. Other shows crack from #2 sleeve to hole where pushrods run. Not sure if the cracks show up to good in the pictures. Supposed to get head back from the machine shop tomorrow with two new valves, new exhaust seats, and had a little shaved off to get back to level.

C. Amick · Jan 30, 2013

Was there any antifreeze in the oil? If not, I doubt that you have a problem with these cracks. Can you put some coolant in the block and check for leaks below in case there are other cracks down lower on the block.

Zach from TX · Jan 30, 2013

No water in the oil that I could tell.

Anonymous-0 · Jan 30, 2013

no.1 does not concern me, no.2 does

C. Amick · Jan 31, 2013

The head gasket should seal around the lip of the sleeve to keep any coolant that leaks through the cracks up on top of the block from getting into the cylinders. I usually use copper spray on my head gaskets to get a good seal, but others will tell you not to.

Anonymous-0 · Jan 31, 2013

True,but what's going to keep coolant from seeping into the push rod galley?

Hairline cracks in SC block

Zach from TX

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C. Amick

Well-known Member

Zach from TX

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Anonymous-0

Well-known Member

C. Amick

Well-known Member

Anonymous-0

Well-known Member

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