Are there still 427 LS6 shortblocks out there? I wouldn't mind putting this block under my current setup. Who makes one? I know I read about them before the LS2 and LS7 came out.

I see this, but would my intake/heads fit on this block?
http://www.katechengines.com/street_...ail.php?id=38#

 

Thats actually a LS2 block that was sleeved on all 8 banks. You could do some-thing similar with an LS1/6 block as well. IMO, that price is about average... give or take. You can get a LS7 440ci stroker for almost the same price, and have more cubes. Just some-thing to consider.

-Kyle

 

I'd contact Katech about compatibility with your heads; then you'll know for sure.

 

The LS2 block is a better block and cheaper than an LS6 block; and getting a professionally sleeved LS2 block to get to the 427 cubes is the best way to go (unless you go with an LS7 block which is more expensive). You have to be careful on the resleeved LS6 block as many of them failed (dropped sleeves) and unless they are done by the best I would steer clear away from it and call KATECK as suggested, as they offer a very affordable 427 shortblock (which I believe is a LS2 block).

 

How much Horsepower is one of these LS2 Value 427 Shortblocks from Katech going to put out? I haven't looked into it at all, but do they offer any sort of warranty? Any idea on reliability?

 

Reliablity would be fantastic as they build racing motors for GM corvette racing team and there is probably at least a one year warranty as long as you don't use a power adder (N20, turbos, etc.) but would have to double check that. The forged intenals of the valued minded 427 using excellent pistons, rods, crank, and would be a very stout piece! Of course there are other vendors around that could do the same thing for you but you can't go wrong with the builders of GM Corvette racing motors (KATECH).

This 427 motor depending on what heads and cam you went with should make anywhere between 525 and 575rwhp (with supporting mods, headers, etc., and a good dyno tune).

 

I would wait and get a stroked ls3. I truly believe they are going to be more reliable than a resleeve and will likely push close to 427 ci anyway, just my thoughts though. The LS3 is proving a much stronger HP engine than the ls2's given the small CI increase.

 

I'm in the process of getting a 440 done based on the ls7 block.

 

How is the LS3 block diff than LS2? I know its a 6.2L. I would probably be good with a basic LS7 shortblock, but gotta know about the
head fit, etc. Today, called K, too busy to answer my call.

 

I researched the living crap out of the best LS engine builders in the Country and here is the email of the professional hand building himself my forged LS6 blower motor as we speak.

erik@hkracingengines.com

He takes his time with the engine builds and is very busy, but his prices are great, his workmanship is better and he really knows his sh it!

He is a master at building N/A motors and can build you a 427 utilizing an LS7 block, darton Sleeved LS2 block or L92 block with longer stroke or new iron LSX block.

Tell him Jim P. from Chicago (whose motor he is finishing up right now referred you).

His name is ERIK KOENIG of HK Racing out of Houston Texas and phone number is 1-713-722-7000 and responds best to emails. He can work you out a great quote for an entire bullet proof LS based 427 and his reputatin is second to none, and he is a very nice guy and will spend countless time explaining things and options to you although he is very busy! He gets many motors back from some of the bigger LS tuners who churn them out and end up having issues that he has to fix and he personally checks all clearances of the motor himself (and many of the shops that tell you they will do this do not as they just can't justify the time and expense). He builds racing motors for many professionaly teams and racers also and his motors can be built to handle big doses of N20 if your into that laughing gas (which i personally am not).

 

The LS2 has a 4" bore, and the LS3 a 4.06, or 8, I think. AFAIK all the LS series heads will work. I'm thinking of having a 427 built from this in a couple of years, hopefully retaining my present set of 215 Trickflow heads. If needed, I'll send them off to Brian@ TEA for whatever machining is needed.

 

I appreciate the link. Why is it that his name sounds familiar, back from my early 90's Mustang racing days. I got tackle a broke axle right now, but in about March to May of next year, I hope to look at something with a little more grunt.

 

So the block architecture with respect to head and intakes is the same. Although the heads are designed for 3.9" blocks, I could in theory bolt them on and a LS6 intake would fit?

 

He has been around the block or two in the building of racing motors and uses GREG GOOD for a lot of his head porting. He may very well have been part of the mustang racing scene from back in the 90s given how popular that was.

He is one of the best bar none, but double the time he quotes you on the engine build which seems to be the norm anyways (but everything else will more than make up for it)!

 

Correct. Your heads will bolt on to an LS based motor. The only heads your intke will not work on are L92/ LS7 style port heads which is more of a rectangle port compared to the cathedral port.

 

Very affordable? Please guide me to missing link on their website cuz I didnt see affordable....

 

If you are legitimately interested in having a professionally top notch built LS 427 motor built, then email him and get a price quote, and tell him I referred you (as I have a good repoire with him and maybe that will save you a couple of hundred $).


erik@hkracingengines.com

 

thats what i am doing

 

There are several reliable ways to build a 427 these days and by using the correct block you will have no issues with oil consumption or leaking sleeves.

Use either an LS7 block (works out of the box) or have an LS2 sleeved. Both blocks will have the appropriate length sleeves to work well with a 4" stroke (properly supporting of piston skirt at Bottom Dead Center)