LS2 Block Forged 402
 

We'll be building 6L (364CI) LS2 motor after Christmas for one of our customers with a Stage1 TTi kit. We'll be using a stock 3.622" stroke crank, Eagle Rods, JE Pistons and more than likely one of Road Rebel's turbo grind cams. We'll then put his LPE Stage2 ported 6L (LQ9 317 casting) heads on top of this shortblock. Should be real nice when its done. Of course we'll share the results...

A 4" crank in the LS2 block should not be a problem at all... definitely need the StageX kit for the bigger cubes.

Yes, you will need:
LS2 Cam Sprocket
LS2 Front Timing Cover
LS2 Cam Sensor
LS2 Valley Cover

Your old knock sensors can be reused. There are unused bosses on either side of the LS2 block that can be drilled, tapped, and helicoiled to facilitate the old knock sensors. LS2 knock sensors are not compatible with LS1/LS6 harness/PCM.

good question!!!
 

TTT for you, I would like to know as well

The LS2 we'll be building will go in an 01 Coupe... that already has the TTi Stage1 Twin Turbo kit.

As I said earlier the LS2 knock sensors are incompatible with an LS1/LS6 C5. The old sensors are screwed into the sides of the block after drilling, tapping, and installing a helicoil in an existing and unused boss. The LS2 sensors are a 2 wire setup... the LS1 sensors are a 1 wire setup. Andy over at A&A has already been through this process... and he has been gracious enough to share the information with everybody. I believe there was a big discussion awhile back in the C6 section of this forum where Andy posted alot of what he learned regarding the C6/LS2... when installing a C5R block in a C6 and the need to utilize the C6 knock sensors adapting them to the C5R block. Stuffing an LS2 in an LS1 based car is essentially the reverse process.

The LS2 timing chain looks almost the same as the Katech chain we normally use. To date we have not seen or heard of this chain stretching or breaking. A double roller is a great setup... no doubt... and not a bad idea to go with when you are talking 750rwhp. We have seen some interference problems with a double roller chain actually riding on the stock crank snout hub on the back side. We have seen this on both the 01-up LS1/LS6 block and the 6L iron block with stock cranks. I just talked with Andy and he hasn't had a problem with the double rollers so perhaps there are or were some intermittant quality control issues (or spec range fluke) with either GM, Rollmaster, or both concerning the tight clearances between the chain and crank hub.

Nice pics of the 6L block... got one sitting on our shop floor now. If you look at your pic you can tell the significant difference in the valley... which also necessitates the use of an LS2 valley cover (no knock sensor holes).

will oil pan work, different on c6

You know.. no offense but are you even reading what Bill is posting before you ask another question?

In both of your posts you ask questions about items he has already covered.

Read through what the guy is posting before you post another question.

:cheers:

Well .. since you asked.. :smash:

In his post it clearly states that the LS2 SENSORS ARE NOT COMPATIBLE but there are holes IN THE SIDE OF THE BLOCK TO MOUNT THE LS1 SENSORS IN.

Then you asked both of these questions again, immediately after, and also if you drilled to far in would you hit the cam.. implying you though the sensor holes needed to be tapped in the valley, please refer to previous post. Then about the oil pan.. someone already asked... sorry just giving you a hard time... :willy:

Since I am an :blueangel: :bs :nono: :rolleyes:

He is just :crazy: because his wife is going to beat him :lol:

Be a sale right here if you could button the whole lower half together to bolt up to existing LS1 computer/knock sensors, with forged internals, low or high compression pistons-oh, and make it 403 cubic inches!

Oh, and by the way, $3500.00 for the first 10 forum members :thumbs:

To my knowledge the C5 oil pan, alternator/power steering bracket, and water pump will work on an LS2 block.

I have heard that the LS2 block, just like the LS1/LS6 block, is only capable of a service bore... meaning perhaps a 0.005 or 0.010 over to "clean up" a cylinder. So, suffice it to say I wouldn't make a decision on boring an LS2 block until more information regarding its servicability is published or at least communicated more mainstream. For forced induction I would recommend against boring at all... at least on an aluminum block.

Bill :)

Bill - Thanks for the info. Have you tested to see if the LS1 knock sensors actually work and pick up knock retard?

INSOMNIAC,
Yes, the TTi StageX kit comes with Turbonetics T3/T4 hybrid turbo's that can be optioned with or without ceramic ballbearings. Beyond that I'm not at liberty to discuss specifics of the turbo's. Yes, you can get polished compressor housings... but why? You can't hardly see the turbo from up above. Yes, you can option the turbine housing to be ceramic coated... either bright silver or flat black. As a note ALL ducting and down pipes are ceramic coated. I am not sure if the cartridges have a coolant circuit option. I thought they did but I'll ask. The StageX kit manifolds have a T3 flange. I do not know if the "Tuff-Turbo" option is available on the T3/T4 frame... Turbonetics does not advertise the option to be available on the T3/T4 but it never hurts to ask :) Regarding the fitment of larger turbo's I just don't know. I wouldn't think a physically larger turbo is an option due to location space constraints. So, the answer to your last 2 questions, in my opinion, is no.

BLKTA, no we have not tested the LS1/LS6 knock sensors on LS2 block as we do not yet have a running example... but I am very confident that the LS1/LS6 knock sensors will have absolutely no problem picking up knock frequency. If you think about it the knock sensor is nothing more than a microphone. Although the sensors proximity and positioning to the cylinder banks is important, cast aluminum, and cast iron for that matter, are excellant conduits for transferring frequencies in the specific spectrum range at which knock noise is monitored. Sensitivity as it relates to the change in proximity to the event may or may not be an issue... but I'm leaning at this point to it not being an issue. I guess we'll just have to wait and see :)

Bill :)

Man Bill working on T-day...whats wrong with you :crazy:.......and I LIKE it alot :lol: :cheers:

I figured I'd post on a thread or 2 before I start drinkin' :D

Happy Thanksgiving :cheers:

i dont mean to pea on anyones bonfire, but i think SLP have a 402 strocker for the LS1 that is a straight drop in (no block mods). they offera high or low comp version. also sell a short block i think.

anyway have a look. www.slponline.com

thanks Chris.

It is an iron block.