IslandParkRacing

iTrader: (3)

I am relativly new to this engine combo stuff. So help me if i mess up somewhere. Thanks guys...So here we go.

2003-2005 Lq4
Stock bottom end w/ ARP bolts
5.3 un-ported heads w/ LS1 valves
roughly 11:1 CR
Ported FAST90/90
G5X3 Cam
LT's & true duals

Some help now.
what size injectors?
hows that cam?
what about roller rockers? Can i use stock ones?
I want to run a Wet 150 shot.
I want to run on 93 octane
What fuel pump?
And Anything else you guys want to throw in. I need help to make sure its a decent combo. Ive seen one just like this build make almost 400 rwhp n/a and with n20 ran mid 10's.
Anyhelp is much appreciated

skeeter99

iTrader: (16)

almost same set up im going with i like that cam just make sure to check ptv on any big cam but from what i have been told u should be ok on it and u can use ur stock rockers

IslandParkRacing

iTrader: (3)

Thanks a lot. whats your setup look like?

camarochvy21

iTrader: (4)

I like the parts you are using, im gonna follow this thread as I am interested in some whatthe same thing

BOBS99SS

iTrader: (2)

I like katech rod bolts,with a big cam,and a 150 shot there worth the extra money,I plan to do the swap at somepoint,if your gonna spray its worth the extra 65 lbs,let us know how it goes,I plan on sticking my ms4 in my new block,

-Q-

iTrader: (10)

Subscribed...I'm also about to do an LQ4 build.

BOBS99SS

iTrader: (2)

Ok I have double checked the weight some said 65,some said 95 and there were a few others,so which is it?

IslandParkRacing

iTrader: (3)

I'm thinking more around the 65 lbs. 95 just seems like a bit much. but its deffinatly worth the weight. And the main reason i want the 6.0 is because ive seen nice numbers great curves in power and I'm planning on getting a roller. So mainly is because i want a roller without the engine. And I'd rather a 6.0=P

ND2RACE

Not sure about your head choice, 5.3 heads have smaller valves then LS1s and flow for **** so with no porting just slapping the bigger valves in doesn't sound very reasonable, but other then that I'm running something similar. I went with stock LS1 heads with a little clean-up port work and machined them down to bump compression (about 10.5:1). I'm running 37.5lb injectors so in my f-body at 58psi they're about 42lb/hr, Walbro 255 has been enough for the engine and 150 wet shot of nitrous. My car has gone as fast as 10.65. I also have the stock LS1 rockers and a less desirable Weiand intake. Car made 508rwhp.

IslandParkRacing

iTrader: (3)

They say with the ls1 valves they flow damn near the ls1 heads. so with more compression and the valves should be atleast the same? no?

ND2RACE

Thats not how I understand it, that isn't something I have seen done but I don't think you can just swap valves without machining the seats and it would still have smaller runners. They don't flow anywhere close, if you're refering to aftermarket companies that put bigger valves in a 5.3 head they start with a raw casting and completely rework it.

Buffalo

Subscribe? Check!

IslandParkRacing

iTrader: (3)

I'm not 100% sure. but ive seen a guy put almost 400 rwhp with this combo and thats around what i want and with the 150 shot he ran a 10.5 1/4 at 131. not too bad. Im not sure but i like the fact the heads are cheap and bump the compression and make decent power so We will see!

TA63

iTrader: (5)

Spend 3-400 on a set of 243 or 799 heads. Cut them .025, and your compression will be over 10.5-1. They also outflow stock 5.3 heads by a wide margin.

IslandParkRacing

iTrader: (3)

500 bucks i can get new 5.3 heads. Either way i think im sticking with the 5.3's. not the best not the worst. and cheap. and im looking at a budget build. need to start somewhere. with the 5.3's i should be around 375 to 400 rwhp 350-385 ft lbs of torque. Which for a kid that will be 19 when its done. its not bad...a mid 10 second car with N20 =D

IslandParkRacing

iTrader: (3)

http://www.youtube.com/watch?v=GVJYweGlkGk

Basically where most of the ideas for the build came from.