Originally Posted by Slow5.0.

What is the compression ratio of a 5.3? The reason I decided to go with the 6.0 was because of the extra Ci. I am not really familiar with the 5.3 cyl heads but I know they flow good in regaurds for n/a power.. and its been proven the engine works well with boost too. The 6 litre has larger chambers (74cc I belive) which results in the lowered compression. The heads are huge and think that the 6.0will make more power for each lb of boost respectively with the same turbo.

I think its a no brainer if you have the cash a 6.0 would be the way to go hands down but to some it just may not be beneficial to spend the extra cash.