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Mod | | | Forums66 Topics128,092 Posts1,056,455 Members48,443 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
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#68863 11/19/2006 9:07 PM | Joined: Apr 2006 Posts: 11 Junior Member | | Junior Member Joined: Apr 2006 Posts: 11 | Are these heads noted for cracking? I have a head that has a cracked that leaked water back into the cylinder which led it to be Hydro locked. The #4 block cylinder will need to be sleaved, but can the head be repaired? When looking into the Exhaust port the crack can be seen. Water will leak into the cylinder and when the exhaust valve opens, water runs into the cylinder.
What the heck happened?
It cost, WHAT? Dam!
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#68864 11/19/2006 9:23 PM | Joined: May 2001 Posts: 7,438 Extreme Gabster | | Extreme Gabster Joined: May 2001 Posts: 7,438 | Are these heads noted for cracking? Yes For some reason air can get trapped in the head when the cooling system is filled. By the time the engine is warm enough to open the thermostat, the head is hot. The incoming rush of water cracks the head. To prevent this drill a 1/8" or bigger hole in your thermostat to allow air to escape as the system is being filled. ... but can the head be repaired? I don't know. | | |
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