baggins

iTrader: (21)

So I have a standard bore ls7 that I just picked up. Its got some mystery flat top pistons, lunati pro billet rods, and a lunati crank. My question is is it necessary to re sleeve the block? I plan on maybe running g a 200-250 shot. This is a street driven six speed car.

Thanks for any input

redtan

iTrader: (5)

Not unless the pistons you have are a much bigger size than can be accepted by the current bore.

baggins

iTrader: (21)

Pistons are 4.125... ill post pics later

ERL Performance

Not saying for sure that you can't do it without sleeving but I have quite a few LS7 cores here with cracked cylinders due to higher cylinder pressure and OEM cast iron sleeves.

Those sleeves were not designed for a 200 to 250 shot of nitrous. I know people will think I'm biased because we sleeve but I thought I would respond to this because I see way to many cracked blocks because of this.

Good luck with your build!

ramairws6

iTrader: (33)

I would agree 100% but thats just IMO and i'm sure we'll hear otherwise...

Reckless

iTrader: (9)

Agree with ERL. I would not push a stock LS7 past about 750 flywheel

87silverbullet

iTrader: (11)

I'm with ERL. The sleeves are prone to cracking. If it was just N/A I would leave it. With the spray I say sleeve it

djfury05

iTrader: (30)

I don't like hearing this since I was planning 150-200 shot

6D9 Matt

NA you should be fine, but yes I would recommend resleeving with any kind of nitrous/blower/turbo.

COPO9560

Building an LS7 based engine is not cheap - why cut corners now. If you can afford new dry sleeves, it would provide a lot of insurance for the future. Last thing you want is to have to build this engine twice.

baggins

iTrader: (21)

So I bought a disassembled ls7 shortblock below are the pictures of the pistons. I am having a hard time getting info on brand and specs. The numbers on the skirt are

809ts & 28583





Thanks, Nick

Shelby7

Darton Wet sleeve it and have some piece of mind.

baggins

iTrader: (21)

Not interested in putting $3k into this block.... if I stay NA will I have any issues

delphigto

iTrader: (4)

You could sell the ls7 block and buy a resleeved one for close to the same money and have a better block.

baggins

iTrader: (21)

Whats an ls7 block worth?

ramairws6

iTrader: (33)

^^^ What he said....

ss454327

iTrader: (10)

TSP sells the LS7 block for $2899.

djfury05

iTrader: (30)

how bout a used LS7 block what's that worth?

baggins

iTrader: (21)

Any ideas on the pistons?

MrEracer

iTrader: (3)

They look like Diamond pistons. I'll give you $1000 for your block.
MrE