I was looking through cars on the internet, and I found several cars that said they had 422-427 CID LS1s in them. How can this be? I thought about the biggest you could make an LS1 was a 396 stroker. Wouldn't they have to be using a different block? Isn't that what makes an LS1 an LS1? You can change everything from the rotating assembly to the heads and intake and it still be called an LS1, but come on, if you change the block it can't be, can it? Is there a bigger LS1 Block out there, a 6.0 liter?

 

Simple...it is an LS1 block.

 

LS1 blocks can be re-sleeved to allow a bigger bore. That with a stroker crank you can go as big as 454ci. Most guys will do a 427.

 

It's not a true "LS1", but if the 396/422/427 etc. is LS1 "based", then guys will still refer to them as LS1's. Like Eric said, it's still using the original LS1 block. Also, it's easier to identify the motor as an "LS1" than try to explain "...it's a 422 cubic inch gen-III small block" to which a person might ask, "...what do you mean gen-III??" so you have to tell them "...like an LS1" anyways!

 

Really? Wow! Is this common practice? Are there any downsides to this? How costly would it be to build a 427 for the street this way? Would it hold up to N2O? Would you need a bigger TB and intake (like the FAST LSX intake and a 90mm TB)? I'm surprised more people don't shoot for 427s and 454s this way. I would love to be able to put "427" or "454" on the side of a forth gen body! *drools*

 

Ah. I see. Yeah, I can see this happening.

 

Yep, it costs money

 

Yuo have 4 diffrent ways of approach on this.
1. You can resleeve the factory block with Darton MID wet-sleeves. Buying the complete block already machined and finished usaully runs around 3k. You can punch it out to a pretty big bore. Then mate it with a 4.250 stroke and you have you "large" cube 454ish ci. Most use a 4.125 bore and a 4.00" stroke to get the 427.
2 You can buy a C5-R block. Cost is about 6k, but it is a production GM part. You can do the same thing with it.
3 You can buy a 6.0 block, bore it to 4.030, slap in a 4.125 stroke, and you have a 423. This is the cheapest route, but you have the added weight of the iron block.
4 You can look into the new LS2 block. They cost 1k. They come with a 4.00 bore stock and will prolly accept anywere from a .010-.020" over bore. Stick the 4.125 crank in there and there will be some ne affordable 406/414's out there.
All depends on how much you want to spend.

 

Here's the link to MTI's 427 "Super Stroker": http://www.motorsporttech.com/fbody_engine02.asp

$2,600 for their re-sleeved block. They didn't list a price for a shortblock on that page.

I guess this is a similar disscussion to one on the LS1Tech forums: http://www.ls1tech.com/forums/showthread.php?t=216832

I want a 550 rwhp 427!!!

My plan: Find a LS1 shortblock on ebay for as cheap as possible. Buy it, but have it shipped to MTI instead, and use that as my core charge for their re-sleeved block. Save up the money to have them build me a shortblock, then have it sent to me.

Then, have the shortblock sit in my garage until I can buy some LS6 head castings. Have them ported/polished at my local shop. Save up money to purchase a FAST intake and 90mm TB. Start putting it in my car.

So, according to my road map I should have a 427 in... *calculates* ...3 years, give or take a year.

 

Last time I was up there at MTI, they had a 455 LS1. Its gettin crazy what these guys can do!

 

That would be bad as hell to put in a T/A!!! *droool*

Quoted here:http://www.ls1tech.com/forums/showth...0&page=1&pp=20

 

http://www.motorsporttech.com/

If you go to the bottom of the page, check out the blue Formula next to the yellow vette. Thats a buddy from my car club, and he owns that 98 427 superstroker Formula! The previous owner ran a mid 10 second 1/4 pass in that monster! Its a beast If you have any questions, he's at ls1tech.com , ls1.com and kyhorsepower.com under the name Cannibal.

 

Cool. Thanks, man!