cyamaha2007

iTrader: (3)

I have a 2003 5.3 and the ls6 intake will not sit down and i dont think i should force it. I removed the valley pan thinking it was the problem. Any ideas guys? I hope i didnt get screwed.

7th Darkness

iTrader: (15)

Post a pic of the intake and engine, will be a little easier to help.

JonCR96Z

iTrader: (33)

What is it hitting?

cyamaha2007

iTrader: (3)

i can not tell what its hitting. Its rocking, the back will lineup but then the front wont line up. I dont have a camera to take a pic.

02gmc5.3

iTrader: (11)

It's probably hitting the steam crossover tube.

jsteele90

iTrader: (13)

did you grind or whack the fins off the bottom of the intake?

JonCR96Z

iTrader: (33)

You would think that if he removed the valley cover that he would have pulled the corss over tube as well. Does a 03 5.3 even have crossover tubes that would be in the way?

69LT1Bird

iTrader: (1)

I vote crossover tube, the truck has a different shape than the car tube.

SIC LSX

iTrader: (10)

push the crossover tube down and bend it! You should be good to go. or see if ya removed those plastic clips on the knock sensor wires. BTW the truck intakes are better the the ls6 intake if you motor is in a struck still

cyamaha2007

iTrader: (3)

I removed the cross over tube and the knock sensor wiring. I havent modified the intake in any way. Im at a loss.

cyamaha2007

iTrader: (3)

Oh and it does have a a crossover tube on the front and block off plates on the rear. I wish it was in a tuck but its in a 95 ta

f-bodyguy

iTrader: (9)

hmm...crossover maybe...i dont know of anything else it could be..

JonCR96Z

iTrader: (33)

Good call!

SIC LSX

iTrader: (10)

Lol

00pooterSS

iTrader: (40)

If it is contacting the heads but not sitting 100 percent flush, which I assume its not since you said it rocks, then the intake is warped, I think mine did just a hair too, but I cant recall if that was before I got the fins and tubes all fixed up properly, but you have no crossover to worry about. The gaskets will take up some of that rock and the intake being plastic should flex a little without issue, are you dropping it down on the heads with no gaskets? If so and its just a litte rocking I would put the gaskets in and torque it down lightly and it will probably be just fine.

Armageddon

iTrader: (41)

I read through this and got the impression it's warped. How much gap are we talking? Being a plastic manifold there's a good possibility, "assuming everything else is like it should be", that the intake will relax after being heat cycled.

Assuming the gap isn't huge I'd bolt the manifold down in sequence with gaskets obviously. Check for vacuum leaks on initial startup. After running the motor through several heat cycles check the manifold bolts and tighten as necessary.

Good luck

cyamaha2007

iTrader: (3)

2 of the dowel pin/ bolt boss were a tad too far apart. 30 seconds and a file fixed it thanks guys.