6.0 build plan
 

I am saving the turbo build for when I return from Okinawa(next duty station) so I will just rebuild my LQ4(145K) when I get back from Afghanistan before I swap it into my 85 C10. I am going to hopefully just use the stock internals w/upgraded rod bolts. My question is in regards to heads/cam. I will leave it stock for now to get it running but I plan to swap some 243/799s(for the compression) and a cam at the same time later on, my question is should I save for some ported 243s or just go with stock 243s? It will be a daily driver with the occasional trip to the strip and either a TQ3 or Tsunami cam kit. I would like to reach 400-425 rwhp through a/th350 and 9" w/3.89 gears. I will also keep the stock truck intake unless I can find an LS6 before the swap happens.

Re: 6.0 questions
 

I would really think about picking a direction. the lq4 is great for boost because it already has the lower compression vs the lq9. I would hate to see you spend the money on heads and cam, and then have to swap them again when you went FI...or at least swap out the cam.

If it were me (and its not....do what you want to do) I would either; buy a cam for some instant gratification, save for the turbo and FI cam and put that stuff on when you have the money. then you can sell the old cam for a little bit of $.
or
Just do the rod bolts and save up some cash, then throw the turbo on the stock motor. Run conservative tuning until you can afford the FI cam and then swap it in.

I hate building and driving and saving at the same time. You want the power NOW, but at the same time you want to save to do it right. Its a hell of a tightrope man, we all walk it lol.

Re: 6.0 questions
 

The turbo build will start with another block/forged bottom end all together with nothing coming from this motor and that won't be for at least 4-5 yrs from now(I will be in Japan for 3). I was going to do a cam/intake but I don't like any of the intakes for N/A(too much $$) so I am going to stik with the truck intake. I can get a set of stock 243s for about $450 and the bump in compression will really wake it up. I have too much time on my hands out here so I think about the build too much. I just don't want stock, I mean who does?

Re: 6.0 questions
 

I will drive the truck for 1-2 years depending on when we leave for Okinawa.

Re: 6.0 questions
 

It will not be easy to make 400-425rwhp with a freshened up LQ9 and stock 243's. My guess is you are going to need a set of ported heads to get you there. My little 347 cube motor made 402rwhp through an unlocked 4L80E with ported heads, healthy cam, Super Victor intake, dominator TB, UD pulley and 1 3/4 stepped to 1 7/8 headers. Yes the LQ9 will unshroud the valve letting it breath a little better, but you better invest in a darn good intake. I'm affraid a truck manifold and/or an LS6 won't get you there.

It's all about the total package.

Keep in mind, most of the dyno pulls you see with autos are locked torque converter numbers (mine went from 402rwhp to 449rwhp). Your TH350 does not lock.

What are the other supporting parts you plan to go with? I can help you model things on Engine Analyzer.

Re: 6.0 questions
 

ahh didn't realize you were looking at a longer term plan. I guess in that case then get some 243's and a decent cam like you were thinking. The 243's will take you up in the compression, and net you some nice gains. Wouldn't kill a budget either.

Re: 6.0 questions
 

L92 heads off an ls3? and a nice specked cam. i have seen builds getting 550hp from a l92 and cam swap on a lq4

Re: 6.0 questions
 

that would also require him to go with a new manifold as well. I think the TBSS truck mani would fit, but if you go with a car-style manifold then the accessory drive has to change also.

Re: 6.0 questions
 

243s and 317s are the same. 317s have larger chambers so most have them shave 30thousandths and CNC'd.
I would talk to Advanced Induction in NC for the CNC work. Have used them on most of the builds.
Truck intake works up to about 5800 depending on set up.

Re: 6.0 questions
 

Go to www.performancetrucks.net and check out the forced induction section. Tons of turbo silverados on there.

Re: 6.0 questions
 

TBSS intake fits LS1/2 LQ4/9 manifolds. The LS3 heads require an L92 intake.


Like Shon said, Andvanced Inductions does some good work.




These are few and far between. Not to rain on your parade, but how many have you seen?

These are ported/milled L92 heads with much tninner heads gaskets, and a lot of little tricks. I'm not saying it is impossible, but there are some things about the L92 heads on that 4.00" bore that just aren't right. The throttle response and driveability of a 6.0 with ported 243 would out right kill a L92 headed 6.0. Sure WOT would be fun, but it better have a decent stall and gears. Just sayin.

Re: 6.0 questions
 

Here is an LQ4 with ported/milled L92 heads making a whopping 463rwhp through a M6 drive train: http://www.ls1tech.com/forums/dynamo...o-results.html


Here is a 402 with ported unmilled L92 heads making 511rwhp: http://www.ls1tech.com/forums/dynamo...9-formula.html


One more.. A 427 with a ton of goodies including a Fast 102mm intake, CNC heads, Decent sized cam, making 508rwhp through an auto. If it was in a 6 speed, it might be around 550rwhp: http://www.ls1tech.com/forums/dynamo...eads-dyno.html



The point I am trying to drive home, is L92 heads aren't the answer to everything out there. You can't just throw them on a motor and make 550rwhp. Some of these examples above are engines built by reputable shops and they aren't even making the power you are talking about. If you have some examples of these 550rwhp untouched L92 headed LQ4's, I would love to see them.



Sorry to get side tracked :)

Re: 6.0 questions
 

Super73, I am looking at the Tsunami cam package from Texas Speed, and long tube 1-7/8 headers. The reason I didn't list the L92s is bc like Super73 said I want the power where I will use it and spend the least amount of money. I thought about doing the whole Vic Jr/4150 tb but I don't think it will be as good on the street so I will save that for the turbo. 243s or 317s, a good cam and I will be happy for now. 1hp per/ci will be alot more fun than .000000000000001hp per/ci I have now in my tired old 305.

Re: 6.0 questions
 

I hear a lot about how the L92 heads are only good for WOT, and for big c.i. motors....but GM's engineers put the L92 heads on the LY6, which is a 6.0L and a truck motor at that. I'm sure the VVT would help.....but my 6.0L/(364ci)200-4r powered truck w/o VVT is snappier then it was with the old 2.02/1.60 valve, small cam, iron headed 383ci sbc and turbo350 I had in it before? And as far as WOT or anything close to it goes.....well I could spin the 275/60-15 BFG's before......but not from a 30mph roll....and not after it went into 2nd and barked the tires....now they spin for a while longer before grabbing. Until I get my bigger tires for the rear, I'll have to feather it at the track for sure.

Coming home yesterday I ran it up thru 1st and then hit 2nd at about 35-40mph hard...so hard I had to get back out of it because it kicked the truck sideways... :lol: ...something it generally doesn't do.

Re: 6.0 questions
 

Having to change the intake throws the budget aspect of them out of it for me

Re: 6.0 questions
 

Softball,

When I have a few minutes I will model a 6.0 with the Tsunami, ported 243 heads and 1 7/8 headers. I'll give you a break down. What intake? LS6? Here is a dyno graph showing the difference between a factory LS6 intake with ported/filled throttle body and the super victor I put on my truck. This is the same exact combo other than the intake swap.

http://73-ls1.com/63truck/Dynos/Supervic_LS6.jpg

I can tell you that going from an LS6 to my super victor lost me a little TQ, but, throttle response was way up and it pulled clean to where it should.

Your added displacement coupled with the larger bore is going to move more air at lower rpms (and even more in the upper rpm range). You have more displacement to fill with similar heads (ported 243's to my old heads, both being cathedral port). This is not a bad thing as it helps create velocity. If you restrict the heads with a bottle kneck intake, you will not make as much power. Velocity is needed to make TQ, the shape/size of a ported 243 head, will give you that.

The super victor (and Vic JR which I would never recomend) "kills" TQ because of it's short runner. It's tuned for the RPM and it doesn't always equate to "loosing" TQ, but rather moving it up in the rpm band, similar to what a large cam some times does. If you move the TQ higher in RPM, you make more HP.

I woun't disagree that I lost a little TQ, but it also carried it further in the RPM band, hence the higher HP.

If it were me, I would go ported 243's to get the compression up some, run a thinner head gasket with them, Super Vic intake (or ported fast 102, but that's more cash), and a custom cam (which I can help you spec).



68GMC,

GM used the L92 heads because all the RD that went in to them. They were supposed to be the next best cyl head slated to go on the 427 LS7 ZO6 motor. When GM could not fulfill the goals they set out to achieve, they hired a 3rd party cyl head designer to come up with the LS7 heads. Since a lot of money went in to the L92, and they flowed better than the LS6 head, they went forward with it. VVT helps them, no doubt.

I'm not saying they can't make great power. I have thought about using them on a 4.125-4.25 bore / 4.1" stroke NA motor that I might do in some time. But this would be a wide open drag race motor.

Re: 6.0 questions
 

Super73, would it be an absolute pig on the street with the Vic and 4150 style tb with the right cam? I really like the look of the LS with the Vic and 4150 and i can plan to use that combo when I go turbo. I don't mind saving a little longer to get the right combination of parts that work together. When I get to my "home" tonight I will look into the AI heads.

Re: 6.0 questions
 

This is the cam recommendation that I got from PatG on LS1tech with the 4150 style TB:
226/230 .598”/.609” 110LSA +4 advance (with 1.7 ratio rockers)
Comp EPS/LXL lobes 54-000-11 3 bolt cam core
13117R/13159R HR110 LSA +4 advance (106 installed intake centerline)

Re: 6.0 questions
 

Here is my plan for the bottom end:
Sock LQ4 pistons(w/243 heads about 10:1 comp)
Stock rods w/ ARP rod bolts(resized as needed)
Stock crank
All new king bearings
Would you do anything different?
Redline would be 6800-7000 no power adders occasional trip to the strip.