What can I do to a 3500?

[salbers88]

I'm looking for stuff I could do to my LX9, I'm already planning on port&polish along with air intake and exhaust. Whats the bore of the stock throttle body and how big could I bore it out, and lastly whats the peak performance injectors I could put in it?

[IsaacHayes]

Stock throttle is 65mm on a 3500 but its electric control, so you'll need a new TB anyways unless your car has a 3500 already stock.

Headers would be nice, or at least keep the nice exhaust manifolds and re-work them to fit. You wont need bigger injectors unless your stock ones max out, and you'll need to be able to tune your computer as just swapping in new injectors will result in flooding at idle as the computer is set for the injectors it came with. Being able to tune is key.

[salbers88]

3500 is stock I need to know how much i can bore out the throttle body and intake to match, or if anyone knows of any aftermarket TB with manifold

[onefastV6]

What vehicle is the engine in?

[salbers88]

2005 Malibu

What kind of power increase would I be looking at if I did P&P, air intake, exhaust, and throttle body?

[Superdave]

I doubt you need a bigger TB, the heads allready flow TONS, the exhaust manifolds are pretty damn good too... Your best bet is to put in a cam that'll use that badass top end. For exhaust, i'd run something bigger than stock, maybe 2.75" if you can find it, a good flowing muffler as well.

[salbers88]

What cam and muffler would you recommend?


And what all have you done to your 3500, and whats the hp and ft/lbs on it now?

[CNCguy]

3500 is stock I need to know how much i can bore out the throttle body and intake to match, or if anyone knows of any aftermarket TB with manifold

The LZ9 engine also uses an electronic TB that is around 70mm. It has the same bolt pattern as the LX9 TB but I have not checked the wiring harness to see if it is the same. My guess is that it would be interchangable but it needs to be checked out to be sure.

Also, you will want to find something to reprogram the ECM for performance upgrades.

[salbers88]

Are any more parts compatible from the LZ9 and would I have bore the intake manifold for the extra 5mm

[onefastV6]

Both DHP and HPT have yet to support the LX9, I wish one of them would step up and get support for these vehicles.

As far as performance goes, you might want to start with the exhaust. See if you can't rework the Y pipe where the exhaust manifolds connect and then do a cat back.

Then go with the ported upper and lower manifolds, flow results look amazing on these manifolds.

If you really want to get in to performance then I would go with a cam regrind. The LX9 shares the same cam as the 3400 engine, so any 3400 grind should work.

[salbers88]

is the LZ9 cast aluminum intake and heads too? and would the intake and heads bolt up with the LX9

[CNCguy]

is the LZ9 cast aluminum intake and heads too? and would the intake and heads bolt up with the LX9

The heads and intake will not fit because the LZ9 combustion chamber is larger than the 3500 cylinder wall. The LZ engines have nice heads and intakes but they won't fit on the older engines.

Edit: There are some pics of the LX head gasket on a LZ head in this thread.

http://60degreev6.com/showthread.php?t=34223&page=4

[torq455]

how bout this one?
:http://60degreev6.com/showthread.php?t=34223&page=6

[salbers88]

ok, and if i wanted to give it VVT could i just transfer heads from the LZ4 3500 on to my lx9 or is there more involved, and now did we decide the lz9 heads would fit on the lx9 or not?

[CNCguy]

how bout this one?
:http://60degreev6.com/showthread.php?t=34223&page=6

Interesting.... I must have my posts per page set higher since mine shows it as page 4.

ok, and if i wanted to give it VVT could i just transfer heads from the LZ4 3500 on to my lx9 or is there more involved, and now did we decide the lz9 heads would fit on the lx9 or not?

The VVT feature is built into the block. To use the VVT at the present time, you would need to use the engine and ECM from a LZ powered car. No one has done this swap that I know of.

I believe the LZ4 heads are the same as the LZ9 and will not fit either.

Exhaust, cam, porting and TB improvements would be your best bet at this time.