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ok .found out i bent a valve..LOL so getting ready to start putting back together.70 bbc 396 with steel heads passenger side.does every bolt need thread sealant.they told me put some on the bolt holes that don't bottom out.i checked with a screw driver and it looks like all of them don't bottom out and screw into a water passage.am i right or or does every bolt not need thread sealant.. i would hate to put all together and have a leak and have to tear it apart again...any help would be appreciated..thanks guys
 

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Every bolt in a factory block needs sealant. If it’s an aftermarket block they are usually blind holes. But I am going to guess yours is factory.
 

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Don't forget to chase all the holes with a tap to get the old sealant out before you bolt the heads on.

New bolts or staying with original? Make sure the bolts are clean if reusing the original bolts.

Dave
 
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