6r8ph1x: Real Reason To Be Called A Gt.

[6r8ph1X]

so as you may have seen, my gt has taken a poo. I was on my way home from work one day a while back and i noticed it sputtering a bit but thought nothing of it. Untill i glanced down at the oil pressure gauge. UT OH! 10psi at 2500 rpm's. Thats not cool (i thought in myself). so i called my buddie up at the shop and said "Mat, I think i've got a problem". the first thing he says to me is "no you don't, what happened?". then i told him about the oil pressure and he said "actually you may want to turn around and head this way, you've got a problem" so i went up to the shop (milzys) and we diagnosed that there were some type of metal shavings in my oil filter. I thought, ok, i'll change the oil to see if that fixes the problem. NOPE still horribad oil pressure and now it smells like pure burning oil, with a hint of main bearring going out (lower knocking sound but no rod knocking sound). well sheet. now what am i gona do. 3400 swap that bish!!!!! so i did/ am.

list of mods being done at the moment

Ported and polished upper and lower intakes
tce 65mm tb
ported exhaust manifolds
2.5 in downpipe


and i got progress pics. YAY!!!

her sitting at the shop


Empty engine bay!


old valve train with metal shavings visible in base of head.


new motor on a stand


new LX9 springs and new valve seals

[3X00-Modified]

Not to burst a bubble or anything, but you do realize LX9 valve springs are simply 3500 springs... and they have a closed load of 77 @ 1.74 and open is 234 @ 1.299 where the stock 3400 springs are 75@1.70 and 230@1.260 so they are not that much of an upgrade. If I were you I would have gone with the Comp 986 springs if you were hoping for a higher closed and open pressure.

If you simply put those on to be new to the engine since it had 80k and weren't expecting any gains then that's perfectly fine.

[Money pit Beretta]

Where is the roller Comp Cam(lol)? Don't forget to put new crank(both) and cam sensors on(you won't regret it). How many miles are on that engine?

[6r8ph1X]

haha yes 3400 modified, i do realize this. and that was exactl the reasoning on the lx9 springs, small upgrade and new springs

the motor has about 80000 miles so its not a high mileage motor.

[Money pit Beretta]

Man, that's high to me. You need one very bad, so I'll say no more about that. Get a timing chain just in case. How's the compression on that thing?

[6r8ph1X]

well the car it came out of was a 99 grand am gt. But as seen, probably just by me, the motor is a 2000 motor, so i probably has less miles.

[3X00-Modified]

Lower intake stamped 00?

I would recommend finding a set stamped 00 and use those, they have a better upper intake casting.

And yes do at least your crank sensor... with a GOOD brand one.

[6r8ph1X]

which one is the crank one? remember this is obd1 so no 24x trigger. yes it is stamped 00 so yay

[Cliff8928]

The crank sensor is the one that protrudes into the block in the rear. AND the one under the crank pulley.

Regardless of what computer, all 3100s have both. But since you're running just the 3.1 computer, you only have the one going into the block (next to where the knock sensor is on the 3.1)

[Money pit Beretta]

It took me some time(guess I'm getting old), I know now that you are only going to use the one on the side of the block(for your OBD1 wiring). Dang I'm slow.
A new chain would still be nice, while it's out of the car. It could save some time and work down the road. Or not, that's just me, when I put a engine in I don't want to have to do anything to later on(just the easy to get to stuff). What are you going to do about the EGR?

[wicked-irocz]

If the engine runs fine (your not rebuilding it) and your not throwing a cam in a new timing chain isn't worth it at this point. Have fun with the swap. I'm sure you'll enjoy the 40 hp advantage over the 3.1 and 20 over the 3100 coupled with the lower rotational loses of the 3t40 your gonna be wondering what kinda vette your driving. With a good tune I see 14's in your future.

[6r8ph1X]

well guys, heres some little things i've done along the way.

valve covers and timing cover are powder coated (vc's black and tc silver)

upper and lower ported and polished manifolds, sandblasted and then painted black

exhaust manifolds from 3400 ported and polished and ceramic coated silver along with cross over.

brand new oil pan gasket, timing cover gasket, water pump gasket, intake manifold gaskets, valve seals.

using my FFP underdrive pulley

going to fab up a 2.5 inch downpipe

pcv and egr deletes


... not sure what i'm doing as far as AC yet, but i did find out the condenser piping right next to the firewall is completely broken off lol.

oh and let me get this straight, the only "sensors" i REALLY need to transfer over is the coolant temp sensor correct? i believe the crank one on the back of the block is the same one as the other motor. i know the knock sensor is now on the front of the motor instead of the back so i'll have to extend that wire. any others i'm forgetting? (also just so you know, i'm leaving all the other obd2 sensors on for when i do a obd2 swap down the road.)

[Money pit Beretta]

Hey man, What are you going to do about the EGR? You will need an adapter to use your old one. If you use the newer one you will need a newer tube from the manifold to the EGR. If I remember right the wires will hook up to the new one.

[6r8ph1X]

someone needs to adjust their glasses lol, egr delete man lol.

[Money pit Beretta]

Dang, that's twice. Ok, but keep the PVC system. If it's not on there pressure can build up in the crankcase and blow gaskets. And there would be a pressure down there making it harder for the pistons to come down. Those poor rings, think about the rings. No really, keep the the PVC system, it's for the best. With the EGR you can get a little better MPG and you won't have to tune it out on your chip. I know, I know EGR is a bad thing(lol).