Bob_255

My LS1 just bit the dust so I am taking this opportunity to put a bigger LS in my T/A. I would like 500 to 600 N/A but would like to add Forced induction later down the road with out worrying about compromising my engine.
Any thoughts on where I can start and which LS block would be the best for reliability would be great.
Thanks

leeluther252

iTrader: (17)

418 LS3. That way you can use a 4.00 stoke and have a thicker crowned piston than a 427. The ls7 uses a 4.00 stroke but I think it has thinner walls than the LS3's smaller bore size.

If going NA then I'd rather have the LS7 and still have the smaller stroke for longevity.

cmac06

iTrader: (16)

I'd go with a sleeved Al block. For FI, I'd keep steke at 4",but the weaklink in the blocks is the cast liners. Adding sleeves addresses this. For added assurance you can have 6-bolt provisions welded in for less than most aftermarket blocks. I spoke with Seth @ ERL, and he helped making my decision based on the goals I outlined.

Bob_255

Thanks guys. I think after debating this for ever I'm going to go with the 418. I'm knew to this so any help is great. Is that ERLperformance.com?

supersub

iTrader: (25)

Bummer! i just posted an ls7 for sale in the classifieds.

Blackpanther99

iTrader: (8)

Yes, they make great blocks! TSP also has 418 LS3s as well/

Alpha Male

Hasnt the reputation of the LS7 always been that it wasnt the best engine for FI because of thin walls?

6D9 Matt

Agreed

Jefro6996

iTrader: (21)

You could always do an iron LSX block and go for something in 43x-44x range. If you dont mind the extra ~100lbs or so from the iron block.

kickassT/A

iTrader: (3)

You're $4200 into an ERL 6 bolt block if you don't have a core. RHS's can be had for around $4400 if you shop. LSX blocks were around $2650 to my door when I was shopping a few weeks ago. There is a reason you see so many 408's out there, lol

ERL Performance

We can help you no matter how wild or mild you want to go. We have stock sleeve packages from 408 ci LS2's to 416 ci LS3's. We have sleeved blocks from Dry sleeve 427 ci to 454 ci and we have our Superdeck I "4 bolt" or "6 bolt" from 427 ci to 454 ci.

We really do have something for everyone.

Remember, when you're comparing our sleeved block to other blocks, our sleeved block is finished and comes with a finished cylinder hone, align hone and ERL main studs.

redtan

iTrader: (5)

For the most longetivity out of an engine do a 365-366 iron block and boost the crap out of it.

The shorter stroke and smaller bore will give you greater strength overall due to more meat on the pistons and in the block. Tis one of the reasons why even a stock 4.8 can take such a beating, but you don't need to go that small.