First off, not looking for any 3800 is way better talk. I alreay have that covered. Or the aluminum heads are better than the iron. I am not arguing this but i like the way our cars look from the factory. For the most part. I understand the mechanical parts that are needed to mate the two together.

what hp can the stock bottom end take on the 3400?

I know the compression ratio is lowered if using the iron heads and stock 3400 pistons but what is the ratio exactly?

If you were to boost the iron heads would the intake restriction still be as big of a problem as it is NA?
And if you were to remove the fin from the heads does that matter with the boost being added?

Would the 7730 icm be a wise choice to run the engine with and will it support the 3400 stock coils?

I can only answer the last question, yes, the 7730 will run the stock 3400 ignition module and coil pack. I have that setup on my 3500.

The bottom end on the 3x00 V6 is pretty robust. It can safely handle 300 HP, maybe more. That's probably more HP than your iron heads will allow, unless you really crank up the boost.

If you put the iron heads on a stock 3400 bottom end, your compression ratio is going to be horribly low. It'll probably be less than 7.5:1.

Keep in mind that a turbo isn't a magic wand that you can use to make the laws of physics disappear. If the heads are a flow restriction when naturally aspirated, then they will also be a flow restriction when turbocharged. You'll just need more boost to force the air through them.

The 7730 ECM works just fine with the 3x00 ignition system. I know from personal experience.

https://www.fiero.nl/forum/Forum2/HTML/129818.html


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My understanding is youre cramming the air anyway so not a big issue. I would like to retain the semi stock look. For massive power i would just buy a bigger turbo for the 3800. Would decking the heads do much to raise the C/R to about 8

I wouldn't submit a v6 duck-iron crankshaft to 300 HP, but as stated above; you won't get near that without lots of boost. Yes, the stock intake will cut down some on your boost gains, but it won't negate it completely. I noticed the difference in power between the stock and our first custom unit intake; especially when not in boost. If you're not looking for max power, a boosted 2.8 or 3.4 engine with a stock intake will suffice. Do incorporate an intercooler. Just keep in mind the 3.4 is a stroker, don't try to rev it too high.

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