I have a 98 A4 w/ 107K on it. I went out of town this weekend and when I got back the car was knocking. You can't hear it up top only when you listen under the car. It sounds just like the knock in this thread but the sound comes from underneath. Is it a bearing?

https://ls1tech.com/forums/showthrea...ck#post3057755

Thanx

 

Verry well could be knock on the bottom end is bad news, I wouldent run it any more and get it checked out asap maby it can be saved

 

If this is the case; what's the simplest fix?
Is there a kit that replaces all of the f'd up parts?
With 107K on the motor would I be better off doing a complete rebuild?
What if I could get a hold of a 6.0 liter truck block? Any benefits over the LS1?

Sorry to be a pain in the ***...

 

The advantage of the 6.0 liter block is more displacement = easier to make power. I think a 6.0 iron block weighs about 100lbs more so if you are in to handling it can change things. If I am wrong on the weight I am sure I will be corrected quickly. It is a good alternative and many do it. Why not rebuild your LS1 or for a little more stroke it?