sapper_daddy

iTrader: (12)

Hi, I was doing a little pricing and research on a larger replacement for my LS....I got interested in the L92 as it seems like the cheapest 427 you can order as a short block (you probably know it's around 4.9K)
Funny thing is I asked someone on the site affiliated with a shop and they said that the L92 is not a reliable street setup. Any ideas why it isn't? Am I missing something?

gen3performance

iTrader: (9)

Well I would rule out the L92 head as not reliable. GM seems to have no problem putting thier 100K warranty on them. And the LS7 head.

95FbFormula

iTrader: (25)

I think it might have to do with how the L92 block being aluminum and is bored to 4.060 you really have no room for error then add a big stroke. Why not build a 408 or 418 using the Lq9 block and L92 heads. The extra cubes really wont make a difference either way the L92 heads are limited by the L76 intake after being ported until the fast design comes out.

sapper_daddy

iTrader: (12)

Well if re sleeving is the issue then I guess it depends on the process used to get it there.....I know companies like Katech use that supercooling process to make their fit without having to beat them into place. I was looking at the TSP L92 427 when the comment was made. I mean it would only really be an issue if I was turning 7k constantly or if it overheated a little bit then....I dunno I'm confused a bit.

As far as why I was looking at the L92 427...I just thought it would be cool to have a 427, I feel an LSX block in my future...any ideas?

BOWTIE

Most of those builders using the L92 blocks to build 427's are not boring or sleeving the blocks. They are just using the existing 4.065 stock bore of the L92's and putting a long stroke in it (4.100 if I remember correctly).

sapper_daddy

iTrader: (12)

yeah that is correct, so I guess that is even more of a question as to why would the L92 be unreliable?
Maybe the characteristics or that particular bore? I wonder how much difference you would hear b/w something like this and say an LSX427....there are two popular bores for that block to get 427 I wonder how different they sound?

Bigchickenhawk

iTrader: (3)

man what a joke....if done correctly the l92 setup you are looking at is golden....big power with good manners and overall driveabilty. Word to the wise....would steer clear of that TSP setup. Would spend alittle extra and choose someone like MTI...futral....or Stenod. Goodluck

sapper_daddy

iTrader: (12)

Yeah that is what I had understood when I started asking around initially. The thing to me that was shocking was that the technology isn't that different that some specific *characteristic* disqulaifies the L92 from being a "reliable" street motor, but then again this came from someone whom I would assume has built or installed a few of these. That is all I was looking for is overall good streetability, nothing insane at all.

I'm still eyballing the Katech ls7 value block, looks really sweet, just don't see huge glaring reasons to spend the extra coin when this is going to be an all street car, can anyone tell me something I might not be forseeing?? Thanks for the time everyone...~Cullen

big reg

iTrader: (28)

Care to elaborate on why you are saying to stay away from TSP shortblocks?? I am concerned as I was looking at their 427 L92 as well as SDPC 413 LS2.

Gandalf

iTrader: (4)

I have EXACTLY the same questions as I was looking at a stroked L92 (427)setup. Anyone running an L92 427 that can give feedback?

G.

Bryan @ Speed Inc.

iTrader: (19)

i would look into an ls2 403 w/ l92 heads/l76intake

Speedinc has a longblock that they offer like that. looks pretty sweet.
http://www.ls1speed.com/enginepackages.cfm

See5

iTrader: (53)

The L92/LS3 block is fine and yet boring it or sleeving it seems like a unwise move when you can stroke it to 415 economically. Personally I think 4.1" stroke is pushing the limits with the 6.0/6.2 shorter sleeve length.

sapper_daddy

iTrader: (12)

That is my understanding, that the 4.1" stroke is what causes the reliability issues. One sponser told me that they are changing their piston and rod combinations to compensate for this, I dunno but I'd like more information and i'll see what they have to say and post it up.

njc.corp

would also like to ask why the tsp engine or short or long is no good?

pdd

iTrader: (3)

any info on this?

camrs73

Straight from TSP's site, talking about the 427 L92. The 427 has a 4.10" stroke, the 418 has a 4.00" stroke.

http://texas-speed.com/shop/item.asp...d=822&catid=85

http://texas-speed.com/shop/item.asp...d=686&catid=85

MeentSS02

iTrader: (11)

That's the answer I'd go with...if/when I go to build a bigger engine, I most likely won't go over a 4" stroke so I can keep the piston speeds down so I can get some more RPMs out of it (I'd like at least 7k reliably, which shouldn't be an issue).

In my head, the already thin cylinder walls with a long stroke is just a bad idea from the get-go. There are far better configurations available to get you to the displacement you want (albeit more expensive usually). If you have the money, I'd do the Katech block without hesitation...a Warhawk block or LSX would be awesome too, and leave you with a good amount of cylinder walls for clean-ups/rebuilds in the future should the need arise.

njc.corp

whats the power output on this engine?

GSXRofDFW

as others have asked I would like to know why TSP products are not recommended. I have heard good things in the past and they or SDPC will be the first people I call for my next project.

I like TSP because they are closer to me than SDPC and there is something that feels good about driving there and meeting them in person.

Busted Knuckles

GSX, if you're driving to TS from DFW to pick up your engine, you'll pass SDPC a few miles before you get there . I've seen both of their engines and it's a toss-up, IMHO. Buy from whoever you feel more comfortable with.
I don't know that the comment on TS's website about power adders and a 4.1" stroke has to do with experience or more along the lines of calculated caution. The LS series of engines has proven that not only can it make big hp/tq numbers for it's size, it can take quite a beating as well. HUGE factor in my decision to go with one.
I'm going with the aluminum 6.2L block, 4.1" crank and flat tops, hand-ported L92 heads and L-76 intake. This is for my '81 4-speed Corvette, I want a bone-stock sounding idle that'll surprise more than a few folks, particularly those in the passenger seat for the first time! I'm aiming for 550 FWHP which happens to be what most old-timers estimate the output of the 427 L-88 to be 40 years ago Should be a walk with these parts, from what I've seen in person and read here.
Every wrench-head car nut grease monkey knuckle buster knows that bragging rights are part of what goes under the hood. If the number "427" wasn't special to GM, they wouldn't have ended up with that number on the Z06 Corvette engine. I'd be lying if I didn't admit that it had plenty to do with my decision, too