[Z26-T]

Personally I would get a 3400 and go from there. There are probably some die hard iron head guys here, but they're heavy, and don't flow as well as the aluminum heads. (that's if you ask guys who machine race heads). You can blow enough boost into the 3.4 to get the 300 crank hp you want, but why not start out with a better engine?

[citr0]

the reson i want the 3.4l pushroad is because its plug and play. And its easy to get here in norway.the 3400 isnt. 300 was the goal, but im good with 250-270 also.

[citr0]

Heads ported, polished, decked (shaved, 9.4:1 ratio) with SS valves (5-angle valve job) and Comp Cams 1.52 roller tipped rockers / heavy duty pushrods with Trueleo ( custom intake ) , accel 19# injectors,modded "Y" pipe and some good tuning will put get aprox 205.8 HP and 212 ft/lbs torque at the wheels ( and about 230 hp at the crank ).

so to get 70 hp from a turbo is not a longshot.. The comp on this setup is to high for a turbo i guess. Maby some forged pistons. with a little boost and a good tuning.

[ForcedFirebird]

Originally Posted by citr0

Heads ported, polished, decked (shaved, 9.4:1 ratio) with SS valves (5-angle valve job) and Comp Cams 1.52 roller tipped rockers / heavy duty pushrods with Trueleo ( custom intake ) , accel 19# injectors,modded "Y" pipe and some good tuning will put get aprox 205.8 HP and 212 ft/lbs torque at the wheels ( and about 230 hp at the crank ).

so to get 70 hp from a turbo is not a longshot.. The comp on this setup is to high for a turbo i guess. Maby some forged pistons. with a little boost and a good tuning.

Many people have turbo'd stock 3400's and they have around 9.6:1

[Superdave]

http://www.turboz24.com/

400+ HP on iron heads.. alot of boost though.

[citr0]

Originally Posted by ForcedFirebird

Many people have turbo'd stock 3400's and they have around 9.6:1

Okey. hmm but how much boost do they charge ?

Originally Posted by Superdave

http://www.turboz24.com/

400+ HP on iron heads.. alot of boost though.

thanks, that was a good link.

How much boost do the stock piston in a 3.4l handle ? as i understand the rod are forgings ?

if i do what i wrote and get 200 hp (230 crank hp ) at the wheel. How much bost does it take to get in the 300 zone ?

[1988GTU]

With a great tune the pistons should last for a long time. It's the higher rpm's that like to wipe out a cam lobe.

[Shaun41178]

I have about 10 psi on my 3.4 with mild port heads and a 272 crane cam. Its making about 240 whp through a getrag 5 spd in a fiero. Its close to 300 crank but it would probably need another 2-3 psi of boost to make it official.

I am using hypereuctectic pistons. Nothing special, and I have been known to spray a decent amount of nitrous on top of it with no problems either. its not a built motor by anymeans but on the nitrous its probably close to 400 crank hp and its holding up fine. Its all in the tune.

I have a build thread on www.realfierotech.com.

[hookdonspeed]

cit, u can do like im thinking, 3.4 with the 3500 top end, but before i do that, ima boost my stock 2.8 till it goes BOOM.
im also debating on a 5.3l swap.... 303hp out of the box.

[ssdurango]

I just dyno'd my 3.4 (iron head) and I got 231.4 hp at the wheels! It's a supercharged/ 100% propane engine, running about 11psi. Thats about 295 hp at the crank so it's not too hard to achieve 300.