I am trying to find out if an LS7 block would be a good candidate for boost with good internals? I know GM used the 6.2 block just for that reason but GM has to look for longevity, I'm trying to go racing.

 

Not gonna last...LS7 factory sleeves are weak. They split at the tops. Tiny bit of detonation and bye-bye.

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Damn, good to know. What if I replaced the sleeves with an aftermarket sleeve? Or would I be damn near the price of an aftermarket block if I did that?

 

Ive seen a few that were twin turboed for sandrails from that put down big power but I dont know how long they lasted or if they are still running

 

sent you a PM OP

 

If you are planning to add aftermarket sleeves, you really don't need to spend the money on an LS7 block.

Wet sleeved LS1, Dry sleeved LS2 or 3 will be very strong. Superdeck option from ERL is less than a new LS7 block (assuming you have a core) and no doubt far stronger.

 

I think you made up my mind. I found a longblock Ls7 close to me for a little bit more than 2 grand that needs a sleeve and has messed the head up. It looks like its more trouble than its worth.

 

your two best options for sleeving is Race Engine developments sleeving , or ERL... both do great ductile Iron sleeving....

 

RED told me that the 1997-1998 LS1 block is perhaps the strongest of all the LSx family of aluminum blocks.

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Seems like they cant be that good, ERL wont superdeck those blocks, must be 99' or newer. Maybe cause they are already so strong....

 

I'm in the same situation looking for a good way to build a boost happy 427 motor. Having ERL or RED resleeve a block seems like the best way to go from what I've found. I have LS7 heads so I need atleast a 4.125" bore. Looking for a block that needs to be sleeved to start as a foundation to build a boost friendly dry sump 427 for my z06.

 

Well you can look my previuos posts up and find the LS7 I was looking at. I'm going to pass on that one. You can sleeve it and get what you need, but thats if you want to go that route.

 

Find an old 1997-1998 LS1 block...cheap. Send it to RED or ERL. You'll have a beast of a block. Or spend a little more for an LS2 block.

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Unless RED has no clue what he's talking about....maybe you're right and the LS1 is not the strongest of the LSx aluminum family.

What does it mean to Super Deck a block?

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LS7 blocks typically aren't ideal for boost. Are you determined to run a LS7 block? I have a R.E.D. sleeved LS3/l92 block here in stock & ready for big bore / big boost. Let me know if your interested, I'll make you a good price on it, or we can build you a short-block.

 

I'm not determined to run an LS7 block, but it is going in a C6Z with PRC LS7 heads (if they ever arrive, Ordered 8/31). I just need a short block to go with the heads and dry sump/long snout system in my car.

Superdeck is an ERL system. Look at their website.

Besides going to a warhawk, RHS, etc, what are the good options for a 4.125" or larger bore motor for boost with the goals fo 750-850rwhp. Looks like a sleeved aluminum block is the best way to go. I don't care what it starts out as as long as it ends up with what I need.

 

Honestly, any stock GM block will handle 750-800rwhp all day long.

 

Sounds good. Can you pm me about this block. This is something I might be interested in.

 

yes they are the strongest, because they have solid main webing, versus on the later year blocks they are vented windows in the main webing for better management of crankcase pressure.... RED MID sleeves those blocks, and when he does those blocks the whole MID Deck/Sleeve rest right on the main webing ledge on the bottom of the cylinders..... he did one for me a while back, came out great... very stout block

 

Depending on the internal damage, $2K might be a good price for this to use as a core. Kind of depends how much can be saved. Titanium rods, not ideal for your boosted build, would cost a fortune to replace - might fetch a good price to the right guy. Same with one good head, rockers etc.

For what its worth, you don't need 427 cubes or LS7 heads to make 800 or so hp with FI. If these are the parts you go with, you could easily raise your target.