I am looking for a boost friendly short block. I am looking at vendors on here and trying to decide which one is best. I know LME is suppose to be the better one out there but a short block threw Texas Speed and Perf. is quit a bit cheaper. I know you get what you pay for but man when you are talking apples for apples and one is about 800 dollars cheaper. What do you guys think? I have also thought about building my own but not much difference in price. I already have heads ET Performance 255's. I am looking for a LS3 418. Any help or advise much appreciative.

 

HKE was no more expensive than anyone else and he is tops in my book. He taught at the machinist school that the guys at LME went to. PM me for his number if you need. I am quite happy with Erik.

 

That is why I choose him to build the motor in my sig!!

 

Another one here for HKE. That's the only place I'll have a motor built.

 

I just bought a LS3 (416) from blownz06 (aka Nick Steffens). He has a place in Tennesse. Very easy to work with and gives you straight up answers.

http://www.highpressuremotorsports.com/

 

Great Motor you purchased.....I was going to buy that Motor before the 408 I built! !

 

Last i checked the LS1 346 with forged rods/pistons can make just as much power as the bigger cube motors at a cheaper price. Now heads will always make a difference

 

I disagree. You push them equally, there will be no substitute for the extra cubes. Besides, the newer blocks are better. You can push a well built 346 to make some serious power, however if you took the same setup and put it on a 413, it will make same power with less boost and more power with the same boost.

 

14# of boost on a 416 will make around 850RWHP compared to 700RWHP on a 346, plus you gain the extra torque.

 

Cant wait to get my 408 in! !

 

YES that is correct, and i see where my point may have been incorrectly worded. They will make equal power at less boost. BUT both engines will be limited to the total amount of power they can make by the flow of the turbo.

For example if you put twin td04 turbos on a 346 and on a 427 they would BOTH max out at about 550whp. The 427 would max it out at a LOWER boost pressure.

Now lets say you put a gt5533 on both cars. Both would EASILY make 1200whp (assuming poper mods and internals) but the larger motor would make it at a lower pressure.

Now lets take this example further. If you put the gt5533 on a 7.0 LS7 and one on a 3.4 2jz. BOTH would max out about 1450-ish whp(ask me how i know). The major difference would be that the Vette would do it probably between 28-32 psi while the supra would need 43-47 psi. The vette would also SPOOL the turbo much quicker and put less stress on the engine due to lower boost levels.

Where the 7.0 would ultimately ovetake the physical capabilities of the 3.4 would be its ABILITY to spool a larger turbo or turbos.

Where the 5533r is about the limit for the supra as far as ability to spool, the LS7 could employ a 101mm or say twin 4294 turbos and push 1700+.

SO..back to the 346 vs. 6.2 LS3. The LS3 is a BIT larger and therefore THORETICALLY able to push/ingest more air but the difference in cubic inches is so small that it would not be noticable, so they would therefor be limited to the output of the turbocharger.
NOW the heads would make a difference, but with the cheaper LS1 the owner could purchase much better heads so it would be a wash.

Hope this makes some semblance of sense

 

He has a KB 2.8L and not too many have found the limits of that Supercharger in the LSX world. Highest I have seen is just over 1000rwhp in a pro touring Gen 1 Camaro