Thread: Going for 300whp NA

I posted this over at 60degreev6 but I thought I'd repost it here so u guys can chime in on things also

I have bought a 96gtp that had bad heads from the valves being bent by the broken timing belt. I have since gotten another set of heads surfaced and pressure tested. I have ported and gasket matched both sides of the heads.

As I was thinking about the job ahead of me of replacing said heads I thought I'd also throw on my ported lower manifold and custom short runner upper plenum with a northstar 75mm throttle body.

Then I started researching and all I can find out is that most people go boosted when they want to get power from these motors. So me having a love for these motors but not wanting to be like everyone else, have decided to build a NA one just to see how much a person can get out of one.

I have a set of SLR reground cams and will be putting those into a set of 97 cam carriers, and milzy has emailed me back saying that he does still offer 3.4 Dohc headers. So next month when my taxes get back I will be ordering them. I will also be ordering hptuners as then I can tune my Fiero (also 3.4 Dohc) and my Gtp.
I have a FFP UDP, and I have quoted a set of 11 to 1 high compression pistons out from je pistons ( and can get them pretty cheap because I know some of the people who actually make them). I will also be balancing and lightening the whole rotating assembly. I will also be running e85 with 42.5lb injectors

I'm hoping to get 300whp with this setup. Through a 4t65e trans.


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sounds like fun. i had a 05 impala i was gonna mod to make some power like this. then i wrecked it.

i think it was the car gods trying to tell me something

HP tuners does not support the 3.4 DOHC motor.

I'm with some of the others...maybe 235-240whp TOPS

This isn't a VQ35

300whp is some wishful thinking.

and why would you want to make 300whp with a 4t60e?

Originally Posted by gambler87

May I ask what mods u had snowflake or a link to your build thread?

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I'd show ya a build thread but the forums I was on are all offline now.
Frankly I don't even remember the names of the forums.

I had everything available to the car in 2003-2004.
I was also good friends with Mike who owned FFP.
My car was actually one of the first two to get his UD pulley, motor mount, and chip.
IIRC Dykz34 got the first set.

Well in the OP he states he will be using a 4t60e...

Im im sure you could see why I was confused.