what is so bad about gen ii engines?

[caffeine]

Why are you worried about the cost of a TB vs. Cost of a TB + plenum?

[SwiftDrift]

i want a 3400 intake because i dont have to make an adapter and spend loads of cash that i dont have on a tb... besides isnt the 3400 plenum just about as good as the 3500s? i know they are different, but i heard they are not that far off

[Superdave]

So, sorry to thread jack, but is the 3500 NOT considered a genIII? It's a kind-of fourth gen, right? Called the High Value engine?

Just wondering. I want to get the nomenclature right, so when I start another build, I can at least know what I am asking! LOL

Thanks again Dave for your sage advice!

the 3500 LX9 is a gen 3 engine, just the last revision. the Gen 4 "high Value" 3500/3900 is where there was a redesign of the block and many other changes. Those are the LZ engines.

[ericjon262]

i was going to get a 3500, but pay an extra few bucks to get the intake from a 3400, hell the dude would probably tell me i can just take it.

why do you want a 3400 intake? the 3500 intake is a common performance swap on 3400's. seems backasswards to me.

[SwiftDrift]

i was going to get a 3500, but pay an extra few bucks to get the intake from a 3400, hell the dude would probably tell me i can just take it.

[SappySE107]

if its farrrrrr cheaper to use a 56mm tb over a 65mm tb, then there is no point in talking about 3400 vs 3500. Cheapest option is stock 3400.

[SwiftDrift]

i wanted to use the 3400 plenum so i didnt have to spend money that i dont have on some throttle body and supplies to hook it up.... 3400 intake+tb is farrrrrrr cheaper and easier to set up.

edit:also i need tools to make an adapter

[SappySE107]

Stating that a 3400 can flow more is implying comparative testing has taken place to be proof against the 3500.

Wish I had a flowbench, no other job, and ambition to do those comparative tests you are talking about.

[1988GTU]

3400 can flow more so there is absolutely a question until its proven.

Who do you think I am? You can question anything you like, but its not up for debate as far as I am concerned.

Stating that a 3400 can flow more is implying comparative testing has taken place to be proof against the 3500.

I don't get why the hype of a 3500 LX9 is typically downplayed when it is the best bang for the buck to most of us that didn't start out with a 3100 or 3400 as a factory engine. The 3500 just happen to catch the 3100/3400 aftermarket in its midst of a possible growth spurt snuffing interest of the already niche crowd is all I can relate as to the "why" .

[IDCavalier]

Remember, SFI is Sequential Fuel Injection.. just an idle/low RPM mode that made the Gen 3 engines idle smoother and save a little bit of fuel.

After around 2K RPM they revert back to MPFI (Batch fire) just like the Gen 2's were and the later Gen 1's. 80% of the swaps end up running the Gen 3/4 engines in MPFI mode with either OBD1 ECM's or aftermarket like Megasquirt.

So, sorry to thread jack, but is the 3500 NOT considered a genIII? It's a kind-of fourth gen, right? Called the High Value engine?

Just wondering. I want to get the nomenclature right, so when I start another build, I can at least know what I am asking! LOL

Thanks again Dave for your sage advice!

[SappySE107]

Who do you think I am? You can question anything you like, but its not up for debate as far as I am concerned.

[1988GTU]

3400 can flow more so there is absolutely a question until its proven.

With the same port work effort done to the 3500 that would have been used on a 3400? That I question.

[SappySE107]

For Boost, it's no question a ported 3500 WILL out do the 3400 ported

3400 can flow more so there is absolutely a question until its proven.

[1988GTU]

For an N/A motor, I take it ported 3500 heads would out perform ported 3400 heads?


Sent from my iPhone

For Boost, it's no question a ported 3500 WILL out do the 3400 ported

[Superdave]

In my experience yes, some others may disagree but I have yet to see a N/A 3400 run anywhere close to what my N/A 3500 did.