A friend of mine is currently doing a 6.0 swap. One of the header bolts broke and is stuck in the 6.0 heads. As a result, we will be using the 5.3 heads. Here are my questions:

1. How much will the compression ratio rise due to using the 5.3 heads on the 6.0? This is an lq9 6.0 with a 10:1 CR with stock heads.

2. What heads gaskets will be needed? The ones off the 5.3 or 6.0? The heads have not come off the 6.0 yet and can't compare them.

Any input is much appreciated.

 

Compression will be about 11.2:1 and you will need 5.3 gaskets. Why not just have the bolt extracted from the 6.0 head? A machine shop will do it for you. If you are just planning to scrap those I will give you $200 for them.

Brandon