Notes For Next Motor Build.....

[blazeracer]

Block, get it bored to 4.030... $750

http://www.summitracing.com/newsandevents/media/storydetail/newproductsmedia/Summit-Racing-GM-LS-6-0L-Iron-Block-Now-Available/

Stroker kit #R-KD20135. Comes with a steel crank and rods, forged piston, rings and balanced. $2,000

http://www.flatlanderracing.com/k1-wiseco-02.html

GM Performance LS3/L92 CNC rectagular port heads. With a spring change they flow 354 intake and on the exhaust side. $1,300

http://www.citycratemotors.com/scripts/prodView.asp?idproduct=324220

Rectangular port intake for 4150 carb. $450

http://www.crateenginedepot.com/L76L92-4-Barrel-Intake-Manifold-25534401-P10483C655.aspx

Cam is a Comp Cams hydraulic roller with 255/271 degrees of duration at 0.050, 0.624 lift, and a 115-degree lobe-separation angle.

Hotrod dyno'd this motor with a little bigger stroke at 720hp @ 6,500 and 629 ft lbs @ 4,000

Not bad for a 408 inch small block that can be built with new parts for a little over 5 grand.... Then throw in a power adder!

 

[spd500]

That's silly amount of money to spend on a motor that will only make 750hp , not to mention you left off about $1500 or so worth of parts that you are going to need to make it run .

 

[Gold Member]

Reliable 750 horsepower isn't cheap.

 

[blazeracer]

Reliable 750 horsepower isn't cheap.

Exactly, that can be easily and reliably be pushed over 1,000 with power adders.

http://www.gmhightechperformance.com/tech/0908gmhtp_lq9_408_stroker_budget_build/viewall.html

And this write up is three years old. Parts are now cheaper and perform better for more power!

 

[spd500]

If you get rid of that blue oval it could be  :smile30:

But seriously , 750 is just the beginning for these motors and it can be done for far less money than that and still be reliable .

 

[blazeracer]

Not with a new block, steel crank and rods, forged pistons and CNC heads that flow over 350 cfm.

A used 6.2 pull from a Vette or Camaro will cost this much and not as much power.

 

[spd500]

No , I would go with a used block . It comes with several hundred dollars worth of parts you are going to need to put it together . Stock crank will hold up to 1000hp and the stock heads can be worked to flow plenty good enough under boost to make 1000hp . For a target of 750hp most of that stuff on the list is overkill for an LS .

 

[spd500]

I have seen 6.2 camaro pull outs for what you are talking about spending on the heads . You have to take your time and find a deal though .

 

[blazeracer]

The only thing you'll get for under $1500 is 10 yr old LQ4 6.0 liter.

http://dallas.craigslist.org/mdf/pts/3345844184.html

Here's a quote for a 2010 L99 from a Camaro.

 

[spd500]

I found a 6.2 complete with coils , injection , starter , and pan for $1575 delivered . There is a company in Montana that was the cheapest I found , but it's only an hour from my brother's place and I was going to have him check the motor before it shipped . The old 6.0 motors were $900 through them . They only give a 60 day warranty on them though .

 

[spd500]

But even at $1500 for an old 6.0 you are better off going used . It will have a ton of other parts you need .

 

[jimsplace]

I agree that going with used parts or motors can cost less money. 
The problem I have with used parts, especially high performance parts is that we don't know how used they are. 
A used factory 6.2 LS can put out a lot of horsepower, but again without looking inside you don't know its condition and even if you know the mileage, there is usually no way of knowing whether it was taken care of, was in a flood or ever had the oil changed. 
It's a crapshoot. 
If you are lucky, you get a good deal.  If not, you may have bought a pile of junk.
With new parts there is an expectation of what you are getting and the ability to build exactly what you want.  With used, you get whats there.

I prefer my 540 Merlin BBC with Dart Pro 1 heads and a Blower shop Blower, but I have more than 5 grand in it too.  Way more. 
        :smile17:

 

[spd500]

The used factory motor would be coming apart and being rebuilt with a lot of new parts anyway. So as long as it is buildable it would not matter if it had been ran hard or not . I would still do a fresh build , but with the stock block , heads , and crank . The  LS that he is talking about for 5k does not exist either , he would have a lot more in it by the time he bought ARP studs for everything , an oil pan , a windage tray , a dipstick and tube ,a timing cover , a valley pan , seals and gaskets , an oil pump , all the sensors , etc .

 

[spd500]

Oh yeah , don't forget lifters , push rods , valve covers , timing set , starter , coils , coil brackets , coil wiring harness , msd  6LS , plug wires , flywheel , I am sure there is a lot more to think of too .

 

[spd500]

think.gif crazy.gif Oh yeah , we forgot the bearings  crazy.gif Pretty sure we will need some of those too  :smile30:

I love the LS platform , but if you start out with $5k and setout to build this motor you will have a very impressive pile of new parts and no way to make a motor out of them .

 

[Patchman]

If you can't get it together for 5K, then what makes it such a badazz motor? Hell I can build a nice BB for that money! Matter of fact, I am building a nice motor for about 3.5 K less! :smile30:

 

[Devilman]

Patch... all stirrin up shitt n' shitt... lol

 

[spd500]

I can put together an LS for far less than 5k , but not if I try to do it by ordering all new parts one by one . I seriously doubt that you ordered all the parts for yours new either . That is the point that I was making in the posts above . There have actually been several people who did a few minor upgrades to stock LS motors and added boost and got more than 750hp out of the stock motor . Usually they do upgrade to better head bolts , sometimes rod bolts , and a cam swap is a must . How much would it take to get the same power out of your BBF ? Then consider the extra power you will need to make up for the extra weight of the BBF , how much more power will you need to compensate for the weight difference in a boat application ? The same thing can be said of the newer Ford motors , I would really like to see what someone can do with one of the late model 5.4 like the Cobras and trucks come with , or maybe even one of the V10s .

 

[spd500]

I could start out with this motor and sell the harness , computer , and tranny have most of what it would take to build a nice big inch LS motor for a few hundred bucks . Do a rebuild and upgrade a few parts and it is ready for some boost for well below $1500  :smile30:


http://houston.craigslist.org/pts/3282147342.html

 

[blazeracer]

That's silly amount of money to spend on a motor that will only make 750hp , not to mention you left off about $1500 or so worth of parts that you are going to need to make it run .

$1500 my A$$!! LOL... The final "crate motor" status to drop it in and turn the key was a tick over $10k....

Only 750hp? Here's the best of the best cathedral port heads on a 408 stroker. A far cry from the 720 that rectangle port heads will put out. Any junk yard motor you find under $3,500 will have cathedral port heads.

http://www.hotrod.com/techarticles/engine/hrdp_1012_ultimate_chevrolet_ls_cylinder_head_test/viewall.html

550 - 600 could be fairly easy on a stock rotating assembly, it gets real costly past that. This is all NA by the way. My $hit will be able to cross the lake all day, not run 800 feet and turn it off.