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LS7 block and head bolts holes

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Old Oct 1, 2017 | 01:03 AM
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Default LS7 block and head bolts holes

Hello.

I have a question that has been keeping me so worried. Please, comment.

I had to take of the heads out of my LS7 block to swap the lifters, but once I was ready to put the heads back with the experience of the LS1/6 I tried to clean the block holes for the heads bolts, but no matter how many times I tried to clean them, more oil (top holes) and coolant (lower holes) came in... So, I kind of remembered that when I assembled the engine, the holes where “bottomless”, and not as some holes as in the early LS engines. So, I installed the heads without any problem.

It is night and really late, so no time to check for block cracks. I just want to confirm that my idea on the LS7 block and its holes for head bolts is accurate, or wrong

Thanks in advance.

Rodolfo Lara
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Old Oct 1, 2017 | 08:47 AM
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Normally you'd clean the threads and blow out the holes prior to head insulation.
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Old Oct 1, 2017 | 09:53 AM
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I'm pretty sure they're still blind bolt holes. Stick something like a zip tie down there and see how far it goes down.
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Old Oct 1, 2017 | 01:49 PM
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All of the GM production aluminum LS blocks have blind head bolt holes.
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Old Oct 1, 2017 | 02:09 PM
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Thanks a lot.

I will remove the heads looking for possible damage.

Rodolfo
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Old Oct 16, 2017 | 04:30 PM
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It was correct as mentioned before... The block holes are blind.

Thanks to my luck no damage was found, as only bolts that were not torque to the max, as liquid did not allow it, and the block hold it. I am really happy as not damage occured. More attention next time.
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Old Oct 20, 2017 | 05:28 AM
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Just make sure you get any kind of fluid out of the holes, such as coolant or oil. When torquing bolts, the coolant or oil can cause the block to crack.
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