vVandals909

Since this is a junk yard motor I never heard run, but the seller told he the truck ran and drove perfect before he pulled it about 2 weeks prior to me but get it. What would you guys go through before putting it back in the truck? New water pump and thermostat? Oil pump? Etc, motor I was told had 67k miles on it.

Thanks

vVandals909

Morning bump

96capricemgr

iTrader: (1)

Something to consider, people push the rectangle port stuff because of cheap peak HP numbers. They fail to consider that factory they are paired with the 6 speed automatic that has a 4.02 first gear, the 4l80 has a 2.48 first gear.

Accounting for tire size and gearing the 2015 Camaro A6 would need 2.75 rearend gears to have the same effective first gear as a 4th gen with 4l60E(3.23 used to compare but 2.73 was base option), but they get 3.27. I hadn't looked up tire sizes before but did the math in detail this time, the new Camaro with 6.2l A6 first gear final drive is the same as a 4th gen with 3.85 gears. Half a liter bigger and still needs a lot more gear.

GM isn't giving the rectangle port motors a bunch of gear from the factory because they know everyone liked to swap gears on older stuff, they do it because the rectangle port stuff needs it to feel decent off the line. Of course the newer stuff is heavier but again half a liter bigger motor too.

In the end the newer rectangle port equipped cars have a first gear like a 4th gen with axle gears of 3.85 and an OD like a 4th gen with 2.73. To make a 4l80 feel like a A6 in first with the same tire size you need a 5.31 rearend gear which with the lesser OD will make your cruise rpm at 70mph 3200rpm. Now if you have taller tires than 28.7" you will need more axle gear at accomplish the same feel. Start swapping the cam and raising the powerband and I think it could get uglier.

Sure it may drive OK without this much gear but it wont perform, you could use stall to mask some of it too but get carried away there and low speed driving sucks.

IRONFIST

Coming from someone who did it, 243's on a LQ that already has 317s is a waste of time. If I was you I'd stick with the bottom end. You have enough money to build a stroker, and that long stroke is going to give you gobs of torque. ( think of it like extra leverage ... more torque ). Keep the heads, keep everything but the cam, and bottom end. Just doing a stroker with a very very mild cam will get you at the 500 crank hp level and with a ton more down low torque then you'll ever get with any head / cam combo on stock displacement.
That's what I would do if I could do it again.

vVandals909

So since I really dont want to tear into the motor. A good cam and springs would help the most?

How much horsepower increase would a TBSS intake and throttle body add by itself? Is it worth it? Heard it will work with my factory lq4 accessories?

Thanks

96capricemgr

iTrader: (1)

GM power train engineer told me that intake alone was 6hp on a stock 5.3l. Hotrod did an intake shootout that is worth reading.

vVandals909

So the tbss intake and throttle body will fit on my truck with NO water or accessory bracket mods?

thanks

96capricemgr

iTrader: (1)

If the heads alone are worth 40-50hp then why with very similar cams is the difference between a stock LS6 and LS3 half or less that despite the LS3 displacement advantage? Looking around it seems like the LS3 has a small compression advantage, and bigger throttle body????

weeble1

iTrader: (6)

My assumption is going off of an aftermarket cam vs a stock cam. From what I'm finding, the LS3 responds to modification better than the LS6. LS3 style square port heads are another advantage. I am by no means an expert... so take what I say with a grain of salt.

96capricemgr

iTrader: (1)

The "advantages" are grossly overstated and the poor lowend completely ignored. I have an LS3, not particularly impressed with the engine.

weeble1

iTrader: (6)

I feel like it gives you a bit more room for growth, though. My particular situation doesn't really suffer from the low end. A big converter takes care of that.

vVandals909

Hey guys I appreciate your help and all, but can someone confirm if I would need to modify anything to run an TBSS intake, throttle body, fuel rail and injectors on my 2006 Lq4? So the tbss intake and throttle body will fit on my truck with NO water pumper or accessory bracket mods?

Seems like a cheap 6hp pickup if so and when I do decide to do a cam it will be more beneficial than if I leave the lq4 intake on there?

Thanks again.

weeble1

iTrader: (6)

I believe it will fit but wait for someone more experienced with the truck side to confirm. Are you retaining drive by wire or swapping to drive by cable? I think that will determine if the TB would work.

vVandals909

drive by wire, since I'm getting the harness made, I assume I could tell the harness builder to use the correct connector for the TBSS throttle body and injectors.

corvette c6 zo6

Is this engine is 6.0 L or 6.2 ??

gagliano7

You will have no problems with the water pump or acc brackets.As far as the throttle body not sure if it will work with your tac module and pedal but you could get the fast tb adapter 3 bolt to 4 bolt so you can use your throttle body.
You will need to use the tbss fuel rail. Your rail won't fit but you can use your injectors. The map sensor on the tbss intake is towards the front and yours is at the rear so you just need to unwrap wires from harness for Map sensor connector to reach.

I did this swap a year ago on my 5.3 with a cable TB.