Brief description: new here, first post, not even sure if I'll get a response.
But I need HELP. I'm 17 years old attempting to restore an LS1 to put into my 2004 Infiniti G35, and after that, I have plans for the body, which I'm hopping to bring the final product to SEMA. My other project is a 1977 scirocco mk1.

But back to the point.
I have a LM7 5.3 3rd gen LS1 short block from around 2001-2003
I believe I have majority of the main engine, but I'm looking for a stock parts list. Like a diagram or parts list with every part and bolt in the entire engine. So I can make sure I have everything.

Can you guys help me find a link? Book? Etc
After I clean/resurface and disassemble the engine, I plan on rebuilding it and attempting 400-500hp
But as of right now, I just need to focus on getting it restored.

 

Lm7 5.3 is not ls1. ls1 is alum and 5.7l. 5.3 is cast iron and of course 5.3l. You can bore a 5.3l out to a 5.7 size but its still cast iron although cast iron is stronger.

We have a few places you can look BUT perhaps this book would help you more.

https://www.amazon.com/Build-Modify-Engines-Motorbooks-Workshop/dp/0760335435

Written by a guy at Texas Speed and Perf. Great read with good pictures.

We can help you every step of the way with parts and tech info if youd like.

Email me
Rpmspeedtech@gmail.com

Thanks and good luck!!

 

Yeah, I wish people would stop referring to ALL LS engines as LS1's. As said, the LS1 was a 5.7L aluminum block put into Corvettes and Camaros from 1997 until 2004(Camaros until 2002, the last year of Gen4 Camaros). THAT'S IT.

 

GTO's too

 

Ooops yeah! Them too! lol Sorry!

 

Dont forget cts-v also...

 

Uhhhh yep.... that too.... OK, what ELSE am I forgetting?? LOL

 

You missed just a couple, G Atsma. You got the Chevy LS1 Applications tho lol.

The CTS-V never used the LS1. 2004-2005 used the LS6, and 2006-2007 used the LS2, 2008-2014 used the LSA

1997–2004 Chevrolet Corvette
1998–2002 Chevrolet Camaro
1998–2002 Pontiac Firebird Formula, Trans Am
2004-Pontiac GTO
1999–2004 Holden Special Vehicles Clubsport (VT, VX, Y Series)
1999–2004 Holden Special Vehicles Clubsport R8 (VT, VX, Y Series)
1999–2004 Holden Special Vehicles Grange (VT, VX, Y Series)
1999–2004 Holden Special Vehicles GTS (VT, VX, Y Series)
1999–2004 Holden Special Vehicles Maloo (VT, VX, Y Series)
1999–2004 Holden Special Vehicles Senator Signature (VT, VX, Y Series)
1999–2005 Holden Commodore (VT, VX, VY, VZ)
1999–2005 Holden Statesman (WH, WK, WL)
1999–2005 Holden Caprice (WH, WK, WL)
2000–2002 Holden Special Vehicles Senator 300 (VX)
2000–2002 Holden Special Vehicles Coupé GTO (VX)
2000–2002 Holden Special Vehicles Coupé GTS (VX)
2000–2002 Holden Special Vehicles SV300 (VX)
2000–2004 Holden Special Vehicles Maloo R8 (VX, Y Series)
2003–2004 Holden Special Vehicles Clubsport SE (Y Series)
2003–2004 Holden Special Vehicles Coupé LE (Y Series)
2003–2004 Holden Special Vehicles Coupé4 AWD (Y Series)
2003–2004 Holden Special Vehicles Avalanche XUV (Y Series)
2003–2004 Holden Special Vehicles Avalanche XUV AWD (Y Series)
2000–2005 Holden Ute
2001–2005 Holden Monaro CV8
2005-Holden Monaro CV8 Z
2001–2005 CSV Mondo
2001–present Mosler MT900
2006–present Elfin MS8 Streamliner
2006–present Elfin MS8 Clubman

 

Most here hardly reference the holdens. They have a specific forum but most dont post here on tech. Except the gto guys that wish they had a monaro lol.

 

Yeah, just a couple, huh? OK the Aussies don't count here, as they never reached our shores UNDER the HOLDEN NAME. There. Had to salvage some pride here. LOL
OK, forgot the Firebirds too! But they're just reskinned Camaros, right?
(FLAMES imminent here... EVERYONE take COVER!)

 

I wish Holdens were sold in the states. I always wanted a Ute.

 

I agree! Good cars, and if they had sold here, might have saved the brand from extinction.

 

[QUOTE=tech@WS6store;19679488]Lm7 5.3 is not ls1. ls1 is alum and 5.7l. 5.3 is cast iron and of course 5.3l. You can bore a 5.3l out to a 5.7 size but its still cast iron although cast iron is stronger.

Okay so if it's not Ls1 since it's a 5.3 iron block. Then what is it?
It was said to come out of a 2002 Tahoe, from my understanding is the reason it's iron. The aluminum ones were placed into cars.

 

An ls1 is 5.7 liters 350 cubic inches. it is aluminum.

A 5.3l from that truck is a cast iron 5.3l 325 cubic inch block. a 5.3 is a 5.3. you can also use its production code lm7. the production code for the 5.7 block is ls1. thats what makes them different.
They use the same stroke but the 5.3 block has a 3.780 bore size the 5.7 has a 3.898. that is what makes the cubic inch difference.

 

Ooh okay. So mine is a LM7, not LS1. And the only difference is the cubic inch, and iron instead of aluminum?

 

In the block yes, but its a pretty big difference.

 

Okay well would I still be able to obtain similar power as an ls1? Am I able to use similar parts? And if so, what kind of parts? Or should I only buy lm7 parts?

And what if I bore it out to 5.7? But let's say I keep it 5.3, would that be more fuel efficient?

 

Boring the 5.3 to a 5.7 is all gain and no real drawback. All ls1 parts are interchangeable with 5.3s. They use the same rods and cranks and timing sets and bearings and oil pumps and valley covers anyway.
You cannot make as much power as an ls1 with the smaller bore, but you can make power. Making an iron 5.7 would make as much power as an ls1 could.

 

So there's no difference in parts between the lm7 and ls1?
But with the smaller bore, would I have better fuel efficiency? Just not as much power? Let's say I keep the same 5.3 bore, what would I have to get in order to make about 500hp?

 

Trying for that power level the 5.3 would be no more fuel efficient than the 5.7. are you asking about crank horsepower or rear wheel? The 5.3 has dished pistons so the cr is significantly lower, youd need alot more cam to make more power. turbo or supercharger would be the quickest most fuel efficient way. Otherwise you are sacrificing hp for mpg.
The larger bore would be ALOT easier to make that goal with a smaller cam and still be ok on mpg.