03EBZ06

FACT: I just traded the intake gaskets off my LS6 to the FAST 102.
They fit and seal perfectly. They also worked w/the FAST 90.

SF 1HOTLS1

iTrader: (24)

do the intake port gaskets need to be changed if you pull the intake off a lot of times?

dr_whigham

iTrader: (49)

It depends on what they look like. If they are over a yr old, I vote just get new ones. When I pulled my LS6 the first time, I had the stock gray gaskets. They were melted, and FLAT, flush with the intake itself. The FelPro's I replaced them with look WORLDS better.

raysadude

iTrader: (11)

****! I didnt change my valley cover bolts when I installed my fast102.

Is there any way to tell if the bottom part of the intake manifold is cracked?

SweetS10V8

iTrader: (4)

Its very possible it is, pull it off and look!

BlackDuk98

iTrader: (34)

When you pull the intake off and look at the bottom, more than likely you will not see any cracks, only dimples on the outside. Don't be fooled, pull the top shell off and get to where you can see the bottom of the intake floor. This is where you will see cracks. I dealt with this problem buying a used intake that I spent many hours saving. I should have pics if needed.

raysadude

iTrader: (11)

i took it off one time after the install looking for internal leaks and i didn't even realize it until i see this thread...im an idiot

yeah man if you don't mind, send them to my email, i'll pm you my email, so you're saying the crack is not on the outside but inside the intake floor? i really hope there's no any cracks, is there any way to tell by sound alone? if there's crack, what are my options, it'd be suck if i need to get new intake...

BlackDuk98

iTrader: (34)

Yes, on the intake floor. I will send pics after work since I am on an iPod

BlackDuk98

iTrader: (34)

Every spot that you see epoxy is where an oem valley cover bolt made a slight impression, no cracks visible from the outside. I scuffed every area up to promote a good bond between the plastic and epoxy and the added material on the bottom is just added strength. Can’t be too careful. (Ignore the red lines, that is from a post I did on coolant tube options)


I apologize for the dark pic, but it is the only one I have that shows how small of an indentation on the bottom can cause the cracks on the intake floor.


Here are some of the cracks. 6 in all

dr_whigham

iTrader: (49)

I got sick just seeing those pics....

raysadude

iTrader: (11)

OP sorry to hijack the thread, btw i use OEM bolts from ls6 intakes and FAST port gaskets, i hand tighten them only didn't use torque wrench.

raysadude

iTrader: (11)

man i really hope mine's not that bad yet, it's only been in the car for 2 months now..

Sweet: do you think if there's any cracks on the intake would it affect performance? this could be the answer to my problem losing power switching from ls6 to fast 102

baxsom

iTrader: (6)

if the crack allows unmetered air into the manifold then oh yeah

Blk98Vert

iTrader: (2)

Yes, no way with that cam and a 6.0 you should lose any tq