What block for my 03 C5Z
Thread Starter
Cruising
Joined: Oct 2023
Posts: 10
Likes: 0
What block for my 03 C5Z
I opened it up and I discovered a cracked block. I am looking to reuse as many parts as possible because the engine only had 23,000 on it before the crack. That being said is there another block that will take all the parts from the ls6 or should I just buy another oem/aftermarket ls6 block. I am also thinking of doing a cam and injectors. I’m looking to keep the power reasonable for now so I don’t want to go crazy with the cam. I am unsure of where to even start and was hoping for some guidance.
Melting Slicks
Joined: Jul 2005
Posts: 2,649
Likes: 863
So - you can't really find "new" LS1 / LS6 blocks anymore, so you're options for Aluminum Blocks are pretty much:
Go with a Used LS1 / LS6 block / engine
Go with a new LS3 Block.
If you look on the major on-line auction site - a (heavily) used LS6 engine goes for $4K and up. That engine should probably be rebuilt before installing it. Figure a bare minimum of $3,000, and probably significantly more than that.
The LS3 blocks will fit into your car no problem - but some "Additional parts" will be required - as there are differences between the two blocks, and if you're going with the LS3 block - you would probably want to avail yourself of the better flowing LS3 head design.
You could go with any number of LS Cast Iron engine blocks - lots more availability and lots cheaper - but an extra 100 LB of weight on the front nose of the car. Personally - I would go with an aluminum block in a Z06 - but it's your call.
Go with a Used LS1 / LS6 block / engine
Go with a new LS3 Block.
If you look on the major on-line auction site - a (heavily) used LS6 engine goes for $4K and up. That engine should probably be rebuilt before installing it. Figure a bare minimum of $3,000, and probably significantly more than that.
The LS3 blocks will fit into your car no problem - but some "Additional parts" will be required - as there are differences between the two blocks, and if you're going with the LS3 block - you would probably want to avail yourself of the better flowing LS3 head design.
You could go with any number of LS Cast Iron engine blocks - lots more availability and lots cheaper - but an extra 100 LB of weight on the front nose of the car. Personally - I would go with an aluminum block in a Z06 - but it's your call.
Safety Car
Joined: Mar 2017
Posts: 3,771
Likes: 940
From: Orlando Florida
A great place to start your search, but I’ve been looking for an affordable spare for a couple of years with very limited success. Giant bummer on the crack, — but as already asked — where? There may be some enterprising and effective alternatives out here.
