I would like to to get the opinions and experiences of anyone out there with an Ls2 stroked and sleaved to a 427? How's the drivability and the power?


MTI in Houston would be doing the work.
I'll be sticking with the stock intake and already have a callaway CAI in the car and Kooks 1 7/8" headers are on a truck on their way to my house now.

And if for some reason that doesn't give me enough power to keep me happy, then I'm thinking the engine will be strong enough to take a bit of boost or nitrous.

Anything else I should be thinking of?

 

LS7 head/intake will maximize the potential of the 427 IMHO. What sleeve are you thinking of?

 

Sleeve size is 4.117" unfinished and can be bored out to 4.160". I'm not sure of the exact diminsions of the bore/stroke yet.

That's a good idea for the Ls7 intake, but I'm hearing there is only a 10 - 15 hp gain over stock c6 intake. Hard to choke down $800 or $900 for that

Are the ls7 heads better than the stage 3 from MTI? http://www.motorsporttech.com/c6_engine01.asp

 

You're going to definitely want to get the LS7 heads. They are definitely better OUT OF THE BOX, then the stage 3's. You have tons of room to grow and they are only 2500 fully assembled from SDPC2000.com. They flow about 370 cfm on a 4.155 bore.

As far as who ever told you that the LS7 intake manifold only makes 10-15hp more then a LS2 manifold is retarted. First, the two intake manifolds don't even fit on the same head, and secondly, when flowed, the LS7 head/intake combo STOCK flowed 330+cfm. Good luck getting even 280 out of the LS2 manifold.

As far as choking down 800-900, how about basically cutting even once you get the ls7 manifold (~300) and LS7 fuel rail (129) and i'm not even sure you need it, LS7 heads (2500) for a total of ~3,000 and you've got way more power then the stage 3 combo and are saving money at that.

I suggest that you do a lot more research before you dive into this!

Best Regards,
Adrian

 

LS7 or bust. Dont wast your time with anything else. An LS7 headed 427 would crush an ls6 headed 427.

 

For starters I don't agree with above.

For second, there is only 1 place i'd fully trust to do that and that is by Steve D. @ RED

228 cam is too small, at least a 24x and that is still like a 224 in a 346.

LS2 427 stroker (RED)
AFR 225 or ETPs
FAST 90/90 ported by Tony Mamo @ AFR
a custom cam (I would go Ed @ EDC)

600rwhp in sight

 

I have never seen an LS6 heads flow over 330, and attach even the best ported fast 90 and it will be quite a bit less than that.

 

Thanks for the info on the ls7 intake and heads. That is definitely another option on the table I will consider.

As far as research goes, that's why I am starting the questions now. I'm looking at doing this in the February / March time frame

 

The shop is telling me that the ls2 is very cam sensitive, that is the reason for the smallish cam. That was something I was going to try to investigate as well. I would definitely like to go bigger if still streatable, especially with a 427.

 

https://ls1tech.com/forums/generation-iv-internal-engine/548511-katech-value-427-short-blocks.html

 

i agree 100%

 

MTI told you an LS2 is "cam sensitive"? That's rediculous. No different from a LS1 427, C5R block or any other. All the same bore and stroke. MTI tends to put smaller cams in their strokers from what I've seen. Guess they like their street engines to be factory like, even down to the idle, which is cool. I have a 244/250 and it is 100% streetable, but still sounds bad *** at idle. Gotta have a nice lope.

 

Nice! How much out the door, fully assembled, incl ls7 heads and intake, etc?

 

I bet the LS7 block, which is available these days is better and cheaper that a sleeved LS2?

 

I don't know if the ls7 would be a direct replacement part or not though. plus, after i get into the internals of the engine, I think it would come out to be a bit more than with starting with the ls2. of course with an ls7, I could just do a cam and headers and probably be at 500 to the wheels and then leave the internals alone...

 

It may be cheaper, but a sleeved LS2 block is stronger.

 

The cost will be roughly the same if you are starting from nothing. Pistons cost the same, a 4" crank is a 4" crank, same rods, etc.

 

Our Option 2 sleeved LS2 is cheaper than the LS7 block at $2999.99.

 

not starting from nothing though... already got an ls2.

 

well, i don't think you can use a used block in the sleeving process, and none of your internals will be usable when going to a 427...so I believe you're starting from scratch...something to keep in mind.

Best,
Adrian