5.3l heads with ls6 intake

**Same ol Situation** · 10-27-2011, 05:06 PM

Just wanted to know if anybody has ran the 5.3l heads with the ls6 intake. Currently running the ms3 cam and im getting the itch to get new heads. Also if anybody has what kinda numbers have you put to the rear??

**IH8EVRY1** · 10-27-2011, 05:39 PM

The set up you are asking about MS3, 5.3L Heads and LS6 intake seems to be a common set-up that makes good power. I'm in the process of getting the stuff together to build the same set up. Numbers are going to depend on your car and setup outside of the power plant. For example gear ratio, A4 or M6. If A4, what converter. Tires that will hook up.

The guys I've talked to with similar set ups A4, 3500-3800 stall and 3.73s with full suspension and supporting bolt-ons are going into the 11's. Real low 11s on 100-150 shot of nitrous. I haven't seen anyone's dyno sheets but claims are being made in the 430 range to the tires and upwards of 500 on the bottle.

First hand knowledge, I'm not there yet.

Another thing to note that you'll probably see is that set-up is going to max out your injectors. May want to look into 42lb injectors but maybe someone will chime in with first hand knowledge. Good luck. Search around for "MS3 5.3" and you'll see some stuff on it here and if you google it you'll get results too. There are some videos on youtube of some pretty mean rides with that set-up.

**0rion** · 10-27-2011, 09:01 PM

I run 5.3's with an LS6 on a 228R cam. Never dyno'd it but ran 11.80's with it.

**Same ol Situation** · 10-28-2011, 05:11 AM

My current mods:

Ms3 cam, longtube headers, tsp true duals, lid, and the stock 10 bolt with 4.10 gears,and UD pulley.

I'm hoping with the ls6 intake I can get in between 440-450 to the rear, the car already put 405 down last time I was at the dyno

**0rion** · 10-28-2011, 05:21 AM

probably not going to happen......

**Same ol Situation** · 10-28-2011, 07:40 AM

I'm gonna do some more research on this, if it comes down to it I might just get the fast intake with it. One of the most appealing things about these heads is the low end torqur they seem to produce

**IH8EVRY1** · 10-28-2011, 02:01 PM

405 to 440-450 with only the LS6 intake...From reading you are looking in the ball park of about 15-20 HP gained. You may be able to get an aggressive tune and get there, depending on how the car is tuned now but that may be just out of your ball park. I hope you get there but it may be a reach. On the bottle you'll go over it but that's not going to be your "street" set-up I'd guess. It still should make a lot of power.

I'd say that with those HP goals, you might want to look into different heads or the FAST as you said. That would probably get you there. At the same time, I've read the same thing, that this combo builds good power because of the torque the heads build and the power the cam makes at higher RPM.

**Same ol Situation** · 10-28-2011, 04:47 PM

You really think only 15-20 horses to the rear from a head swap??

**IH8EVRY1** · 10-28-2011, 06:34 PM

Sorry, brain fart...I was thinking intake swap...head swap you should get there...my bad. My noggin was somewhere else I guess.

**TA98** · 12-11-2011, 05:51 PM

I have a set of 5.3 heads i need to send out to get ported i just need to decide who i what to have to them. I had considered selling them for a set of Trickflows but after this video im gonna keep them.

**Lunatikgixxer** · 12-15-2011, 06:14 PM

you have a 2002, You already have the ls6 intake on the car right? So dynoing at 405 is with the cam and the intake?

**WS6SP33D** · 12-15-2011, 06:42 PM

With the setup you are looking at 415-423rwhp from my experience with the ms3 through a t-56. Just a guesstament.

**matt evans** · 12-15-2011, 07:05 PM

my buddy's 00 ss he has was bone stock when we started. He has stock 241 heads,LTS,ORY and magnaflow exhaust, and polluter cam and he put down 440rwhp/405rwtq.

**Lunatikgixxer** · 12-15-2011, 07:29 PM

wait what? 440? with the ls1 intake and heads? what are those cam specs

**WS6SP33D** · 12-15-2011, 08:44 PM

Originally Posted by matt evans

my buddy's 00 ss he has was bone stock when we started. He has stock 241 heads,LTS,ORY and magnaflow exhaust, and polluter cam and he put down 440rwhp/405rwtq.

Thats some very i mean very high numbers for the mods listed. Heads worked? Must be a real friendly dyno. I have installed prob 3 polluter cams on the same setups with no where near those numbers. But hey congrats to your buddy. very impressive.

Polluter cam specs are as follows XER lobes .610/.612 lift , 242/244 duration 112lsa.

**matt evans** · 12-16-2011, 12:30 AM

yea man im not making it up. He has his graph on ls1tech screenname is AFASTM6. I couldnt believe it ether but thats what he put down. And yes BTW with the stock ls1 intake. We just deleted his egr and air. He is 2nd owner of the car, picked it up from a guy who use to work for chevrolet. The only thing i couldnt figure out is it being a 00 and it having 241 heads. Closest thing to an answer i could get was it got sent off for the knock sensor recall and they just put a motor in.

**scott5** · 12-16-2011, 05:34 AM

I was going to do the stage 2.5 5.3 heads, with ls6 intake and ms3 cam. It seems that its a proven setup with good dyno results and good 1/4mile times I have seen them go the whole way up to 475rwhp(once or twice if I remember correctly). The combo has been done many many many times. If I was still going to do a h/c/i setup I would probably still do that setup because the ms3 loves spray.. But since I am going with cam only I am going custom route.

**Lunatikgixxer** · 12-16-2011, 08:50 AM

Originally Posted by matt evans

yea man im not making it up. He has his graph on ls1tech screenname is AFASTM6. I couldnt believe it ether but thats what he put down. And yes BTW with the stock ls1 intake. We just deleted his egr and air. He is 2nd owner of the car, picked it up from a guy who use to work for chevrolet. The only thing i couldnt figure out is it being a 00 and it having 241 heads. Closest thing to an answer i could get was it got sent off for the knock sensor recall and they just put a motor in.

Thats crazy