oxrabidus

How much power do you think can be attained with a modified 3.4L V6, with just an intake, ported and polished heads, headers, and good exhaust?

forkvoid

iTrader: (1)

Not as much as you want.

xiholdtruex

id say you can get about 200 hp give or take,to get real power out of a 3.4l you would have to build it or at th every least cam it.but i know that no matter what it is a improvement over stock hp by a good amount

drdave88

iTrader: (3)

youd be lucky to even reach 180, because im passed that point and i can tell you im probably just at 200, if im even there.

headers and a good exhaust will give you 10ish

intake: if youre talking a "CAI", you might get a couple hp at MOST

porting and polishing, you might gain a lil bit, but the biggest restriction (after exhaust) is in the intake manifold. so even if you can get the air to flow a bit better in the heads, you cant get anymore than the intake will allow into those heads.

the 3.4 put out 160hp stock, so given the wear on the engine (unless its a new long block) and now adding the mods, you might be able to push 180, but honestly i dont think you would. on the other hand, when i did my exhaust and heads, i did notice a difference in acceleration, throttle response, etc. there is more than just HP. doing any of these mods will change what i listed above as well as your torque, peak RPM, CFM, etc. so while you may not notice a big difference in HP, there are many other places that will change.

firstfirebird

iTrader: (3)

Highly ported iron heads may fetch you about 180cfm of flow. The 3400 stock heads flow in the 190's and 3500 heads flow 218CFM out of the box(with manifolds attached). Depending on your mechanical ability, getting rid of the iron heds is the best thing you can do.

There's a guy named Russel who put a 3400 top end and dynoed over 190hp (RWHP), that's into TPI trritory. I'm hoping to see 250hp with fully ported/polished heads and manifolds, long headers, and a big cam. 3.4 with 3500 FWD heads and 11.5SCR should do it.

fictmich

The iron heads you are referring to are the '88 and later ones with the larger valves right? At what lift are we talking here for each of these? Where are some flow charts that would show how much at each amount of lift? Just curious where this info is at because I'd like to compare them side by side if at all possible.

oxrabidus

Would the intake for the 2.8 work on the 3.4 heads? How much lift is possible on those heads, I am thinking Edelbrock Performer Cam(.402/.420 lift).

bl85c

iTrader: (2)

Post '84(?) 2.8/3.1/3.4 iorn heads are all the same, and forget the junk edelbrock cam- it's basically a copy of their sbc performer profile! Crane's really the only company with decent cams for these engines.

The most you could hope for with iorn heads and the stock intake manifold is 200hp- with real porting. Where it does shine is torque numbers. The long runners are great for low end punch, you could see 220ft/lbs depending on the cam you choose. But don't waste your time on them, spend the cash on a 3400 top end. You can make just as much power or more without paying to have it ported.

fictmich

They aren't all the same.

http://users.spec.net/home/emxjc/heads.html

Two different cast iron head assemblies have been used on production v6/60 engines:

• Heads installed on standard performance V6s have 1.60-inch
diameter intake valves and 1.30-inch diameter exhaust valves.

• High output and fuel injected versions were equipped with 1.72-inch
diameter intakes and 1.42-inch diameter exhaust valves (part number
1405489)

oxrabidus

Where can I find these heads? I can find the intake but have not been able to find the heads...

Six_Shooter

iTrader: (2)

1985 and later (iron heads) are all the same. The different heads are in reference to the 1984 and previous offerings. In those years the larger valved heads were refered to as "H.O." heads and could be found on the Citation X-11 and other similar "performance" small vehicles.

Dale

iTrader: (12)

200 after you tune the ECM to your mods.

pre-tune. 180-185.