Who can help me in my quest for head?

[pred1tor83]

Well....

now that o have your attention... heres my ?'s


How big can the 3.4l iron heads valves be made??

ive read about aluminum heads on gen 2 and 3, i realize these would raise my compression ratio to around 12.1-13.1

Does anyone make "big" head gasket?????

More on this later



Btw its a 1996 3.4 stuffed in a 1986 pontiac fiero

[614streets]

Just a quick FYI there is no need to go bigger than 1.72 1.42 unless you are running a 500 plus motor. Any bigger exhaust valve will shroud the chamber. A larger Intake valve will not be worth the additional costs involved. Your money is better spent on a port job by someone who knows what the hell they are doing.

[geoffinbc]

Yea for sure. A good port job on both the head and the intake along with the proper cam will kick ass on that motor.

[pred1tor83]

bump

[geoffinbc]

bump... WTF?? This post is like a day old. Relax a little.

[SappySE107]

What are you planning on doing that you want to use iron heads?

[geoffinbc]

He has it in a Fiero. I guess he wants more power.

[SappySE107]

Ah, so just want the roller cam and use the stock top end to retain the stock look? I mean, I know its a fiero, and I assume more power with using a 3400....but what is the goal of the engine that you want to keep the iron heads? Stock look, ease of install, boost?

Thanks for trying betterthanyou, but I don't think you can read minds well enough to answer my question to someone else.

[AaronGTR]

Why would the aluminum heads raise your compression? The stock compression on a 3400 is only 9.5:1. I have a hard time believing the compression would go up THAT much from putting those heads on an older engine. They are essentially the same block with the same deck height. The only difference might be the pistons or the stroke, but I don't think the compression would change that much. Maybe 10:1.

[RidgeRunner]

AaronGTR - the combustion chamber is WAY different between the iron and aluminum heads, and the pistons from Al head engines have a very large dish to compensate. I haven't seen the iron head 3.4 pistons, but they're either flattops or else they have a comparably tiny dish. This is why using Al heads on an engine that came with Fe heads results in a sky high compression ratio.

[AaronGTR]

That's what I figured but I wasn't sure. Still seems like 9.5 to 12+ is a bit high, but I guess it could be right with a combination of different heads and pistons. Thanks.

[v6h.o.]

aaron: when you go from a 48-54cc sized chamber to a 28cc chamber. yes it does go that high

[AaronGTR]

Wow, yeah that's a lot of difference. I didn't know the displacement of the combustion chamber changed that much. That was when they changed from inline valves to splayed valves right?

[geoffinbc]

Thanks for trying betterthanyou, but I don't think you can read minds well enough to answer my question to someone else.

I did not see that it was a 96 engine.
But why would he ask about aluminum heads increasing compression if his block is a 96 and already has them? I think he has used a Camaro 3.4L (maybe just didn't know the year) and wants to make the iron heads better. But he isn't posting a whole lota info so who knows.

[pred1tor83]

alright, well heres the run down in order


betterthanyou :
Yes, it was only a day old, but it was already on the second page....

so my msg to you would deffinitly be STFU....


SappySE107 :

Im not sure what i am going to do with the iron heads... a neat endtable maybe.. other than that i think i might just recycle them... as for the direction of the motor, i just want the most Na power outa it... i have a custom upper intake... so the stock look is already out the door.

v6h.o.:

thank you for the info it was muchly appreciated...

does anyone on here have a built up na 3.4 i could talk to?