3.4L to 3500 swap

[Jawz]

Hey everyone im new here.

I've been reading up a bit on here about the 3500 swap that some people have been doing and i was wondering if i could get a help on it.

From what i read you can swap out the heads and the lower intake mani.

I have a 94 Firebird thats got the 3.4L in it but when i was looking at most of the lower mani's they seem to big for it. will the 3500 heads fix that problem?

Also the plenum on my 3.4 if the Y shaped plenum that doesnt fit on any of the 3400's or 3500's.

Im just wondering what all is needed to make this swap possible.

Thanks for the help

[pocket-rocket]

You would need to use 3x00 heads, LIM and plenum together. You can't mix and match iron head and aluminum head stuff.

IIRC if you use 3500 heads you have to use a 3500 lower or the ports won't match up, but you can use 3100 (large port only), 3400 or 3500 upper on a 3500 lower.

I'm not 100% positive I have it right as I'm a DOHC guy, so don't take my word as absolute truth here unless I go uncorrected by someone.

BTW, welcome

Sent from my HTC One X using Tapatalk 2

[Superdave]

You'll need a 3500 LIM to go with the 3500 heads, nothing else will work there.

Like Pocket said, you can use either the large port 3100, any 3400 or LX9 3500 upper intake though. I seem to remember the 3500 UIM not clearing the cowl, you'll probably have to use a 3400.

[Jawz]

Awesome! Thank you. What vehicle would be most common to pull them off of? I know they sell them on Wot-Tech but my pockets are running a bit empty for the minute.

[3400-95-Modified]

Wiki search the 3400 and 3500 engine. It shows the applications.

[UberFail]

Straight from Wiki

LX9

The LX9 3500 is an OHV engine based on the 3400 V6. It incorporates electronic throttle control. Bore is 94 mm (3.7 in), stroke is 84 mm (3.3 in) for a displacement of 3498 cc (213 cu in). A GM Press Release for the 2004 Malibu described the 3500 thus: "3.5-liter V-6, will debut in the 2004 Chevrolet Malibu. The engine offers improved performance and fuel efficiency, and runs smoother and quieter than earlier generation V-6 engines. The 3500 V-6 features an advanced powertrain control module, improved fuel injection system, a redesigned exhaust manifold and a new catalytic converter contribute to reduced emissions, as well as improved efficiency and performance characteristics. Improvements in cooling, sealing and the accessory drive system add to the engine's overall quality, reliability and durability." Power output ranges from 196 hp (146 kW) to 201 hp (150 kW), torque ranges from 213 lb·ft (289 N·m) to 221 lb·ft (300 N·m).

It was used in the following vehicles and model years:
2005–2006 Buick Terraza/Chevrolet Uplander/Pontiac Montana/Saturn Relay
2004–2006 Chevrolet Malibu/Chevrolet Malibu Maxx
2005–2006 Pontiac G6 Sedan / Coupe
2006–2007 Buick Rendezvous
2006 Pontiac G6 GT Convertible