02_ramair_ta

iTrader: (35)

Like the it says, I am putting a Lq9 into the formula, and I want to hear some ideas..

I have my MTI 2E heads and the X1 cam on a 112lsa. Do you think its a good combo with the LQ9? The heads should bring the Comp. Ratio up to around 11.0:1. I have checked piston to valve clearance, everything is playin together nice.

Really, I know this deal should work, because its basicly a 4.00 bore iron LS1, but I want to hear some ideas from others who might of done this swap, and things to watch out for.

Thanks in advance.

tspence45

iTrader: (30)

I'm getting ready to do the same swap, only with an LQ4. Only thing I was really told I'd have to do, is drill and tap a hole for the LS1 alternator bracket to work with the iron block. Otherwise, everything else would be the same.

02_ramair_ta

iTrader: (35)

Any reason a lq4 instead of the lq9? I've heard the lq4 a deeper dish pistion, so less compression... Not 100% on that, just what I've heard...

XtremeDime

iTrader: (16)

Maybe he is planning to go FI.

ramdaspadhye

iTrader: (3)

or maybe he's gonna go with ported 5.3 heads for moar torque!

tspence45

iTrader: (30)

It's just what was available for a good price (Fresh rebuild, ARP hardware, 42 lb injectors, and TR224 cam for $1200 shipped). I'm thinking of maybe putting some LQ9/LS2 pistons in there to bump the compression up, though. Just depends on how cheap I can do it.

MustangKilla

iTrader: (1)

Im doing the same swap with a LQ4 and I wish I had 11:1 compression. I used a set of 5.3l Stage 2.5 heads with a Torquer v3 cam and only got 10.4:1. Yours sounds like a good setup. I just put the accessory kit on mine 2 days ago and was worried that I would have to drill a hole for the altenator bracket and I didnt. Everything went in perfect.

tspence45

iTrader: (30)

Any idea what kind of power you're making? I'm thinking of going with that same setup. I might go with Stage III LS6's, if I can get the money together for them, though. Still a little undecided on heads. I may just end up with stock 243's or 799's for now.

MustangKilla

iTrader: (1)

sorry for the late response, but i hope to make about 475hp at the flexplate when its all said and done. maybe a 100/150 shot. I'm also putting a 4l80e behind it. I was thinking about the ls6 heads as well but i didnt go with them bc they would have taken my compression down and the 5.3l's were about the same price. The stockers are good, youre just stuck with that low compression, but i believe there is a lot of porting you can do on those.

tspence45

iTrader: (30)

Sounds like a good setup. I actually completely changed my setup around. I'm going to stay low compression for now, it seems. I'm going with some L92 heads and LS3 intake on mine. If I can run a cam as big as the Torquer V3, it should put me ~560-570 hp at the flywheel, and all with basically stock GM parts and a cam. Only problem is, I'll still be stuck with low compression, since the L92's have 70cc combustion chambers. And I don't want to mill them, because I'm worried about PTV clearance with the huge valves they have. According to a Car Craft article with a stock LQ4, with a custom cam, with a little less duration, and a lot less lift than the V3, they made 551 crank hp with a set of stock L92 heads and a carb intake. So, I don't see why I shouldn't make a little more, since another test I saw showed that the LS3 intake flows a tad better and I'd have a bigger cam.

MustangKilla

iTrader: (1)

do you know what the compression of the engine on that article was?

tspence45

iTrader: (30)

Seeing that the combustion chambers are essentially the same size on stock LQ4 heads and L92's, the compression ratio stayed basically the same. http://www.carcraft.com/techarticles...ads/index.html

MustangKilla

iTrader: (1)

personally i dont see how you could make more than 500 hp with that setup but i have been wrong before. maybe there is something i'm missing

jason00ss

iTrader: (2)

you are missing something, he said at the flexplate/flywheel

MustangKilla

iTrader: (1)

its so simple

tspence45

iTrader: (30)

It's so simple because those heads even outflow most of the ported LS6 castings people sell. They flow 320-330 cfm straight from GM. I've heard that a simple valve job will put you up near 360 cfm.

MustangKilla

iTrader: (1)

you should also try milling them as well. since they flow that well milling them would bump up your compression a good bit if you have the PTV clearance afterwards