I'm doing a LQ4 6.0 swap in a third gen this winter and 400rwhp is the goal. Can I do it with an LS1 intake, decent headers/exhaust, and a cam small enough for LS6 springs? I'd be okay with milling the heads to get the compression up.

Any cam and/or dyno results would be much appreciated.

 

In my opinion, you're going to need an LS6 intake, all boltons, and a cam like the TSP 224R. You may be able to do it with a little lesser cam, but not with a cam that's small enough for LS6 springs.

This is all purely out of my head with no dyno results in hand, but I just don't fathom it happening with that small of a cam. What heads are you using?

 

Heads are the stock 317 castings. I'm not dead-set on using the LS6 springs but I'd rather not spend the money on the Patriot duals if I can avoid it.

How much power is an LS6 intake worth over an LS1 at this power level?

 

a gm hot cam sounds like what u need,
mill the heads some for more scr and it should have no problem making 400+rwhp with all supporting bolt ons and tune.

 

a ls6 intake should be a standard part imo, accept nothing less than
mill your 317 heads for more scr, .040= 10.25:1 on lq4
.030= 10.15:1
stock scr for lq4 is 9.4:1

 

LS6 manifold, ASA cam, LS6 springs, 1 7/8" headers and a 3" true dual exhaust

dyno graph of an ASA cam
https://ls1tech.com/forums/attachmen...8&d=1196221160

 

I know the LS6 is the way to go for stock manifolds, but they are expensive. I want to know how much extra horsepower $350 buys.

 

Is that the combo in the graph or just your general recommendations?

What transmission is in the graph?

 

The LS6 is worth more HP and TQ right through the entire rpm range...definately the intake to go with over the LS1 for your goal.

 

i would say on a 6.0 with free flowing exhaust and cam up to 30hp but not limited to. a 6.0 really needs the ls6 just to begin with.

 

I did it with a stalled auto, but a more agressive cam (F13). If your's is a manual, you might be able to do it with a hotcam and an LS6 intake. Definately doable.

 

Auto or Manual? The extra 18ci doesnt make a huge power difference. If it were me I would never use a cam so small that LS6 springs are able to handle it. You dont need PRC duals but they are good springs. I would get a 228R from Texas Speed, order springs with the cam because you get an little $$ off for buying it together.

An LS6 intake makes a big difference on an LS1 with stock heads, IMO it shouldnt even be considered on a 6.0.

 

+18ci and 4.00 bore, will make a difference over 346ci 3.9 bore

 

I did some checking on the ASA cam and it looks like it is pretty sensitive to backpressure. The exhaust on this car is a single 3" flowmaster so I'm not sure how well it will work. I'm going to build 1.75" headers and the y-pipe has a smooth transition.

Any other cam suggestions or dyno results?

 

As soon as you install that cam, I have a feeling you're going to be telling yourself "I should've gone bigger".

 

You're probably right, but this is kind of a budget build and it's not my car.

 

LQ4
224
any beehive spring (budget or not, why skimp on springs? Beehive are not that expensive)
Nice LT'. Pacesetters. I duno about home made LT's?
Decent cat back
LS6 Manifold(you NEED this on the 6.0)
TUNE

You will be at 400.

 

I have not noticed any issues with the asa cam and backpressure. I run this cam and just went from duals to a y pipe and catback setup. If anything it runs better now. You can hit 400 with this cam or anyother small cam. It might be cheaper to just do springs and not worry about other boltons like the damn intake everyone praises. Get the springs and the cheater cam and thats your 400 right there.

 

Okay, I'm going to get an LS6 manifold. What springs can I use that are fairly cheap?

 

http://www.texas-speed.com/shop/item...d=208&catid=48