LS14EVR

iTrader: (3)

So I tried searching for the answer since I'm sure it's been asked before but I couldn't find anything. So it seems that #7 and 5 ringlands are most common of the 8 cylinders for failure. Can someone tell me why?
Thanks

1BADAZZSS

iTrader: (23)

Coolant flow issue. If the the steam vents ports are blocked off in the rear of the heads it causes the cylinders to run hotter on #7 cause there is no way for the steam vapors to exit the rear of the head. Search "water vapor collection system"

willizm

iTrader: (10)

^what he said. I have just the fronts vented, but I'd like to vent the rears too using this.

http://kurturbanperformance.com/ls-w...or-system.html

I know there are many other guys that did similar setups on the cheap so you'll probably hear them chime in.

LS14EVR

iTrader: (3)

Thanks for the quick response.

ROCNDAV

iTrader: (100)

Doesn't that place the connection higher than the radiator port?

I thought the radiator port had to be the highest spot?

ROCNDAV

iTrader: (100)

Also, I read somewhere that it is also due to the fact that the last spot of the intake port, thus all of the remaining incoming air forces into the #7, so it runs leaner.

willizm

iTrader: (10)

I want to add to this question. At what point with a FI car does this become more necessary? I want to do this regardless and will be pushing between 12-17psi on e85, but I'm by no means a high hp turbo car either. I guess I'm trying to get a sense of urgency. Also my block is a forged ls1 with the fronts vented using the stock connection

1BADAZZSS

iTrader: (23)

Most guys remove the factory four port ones when going to a ls6 mani or fast. But you can always trim the bottom side of the mani for the stock 4 port steam vent to clear if your not using a standard ls1 mani.

willizm

iTrader: (10)

That I'm not sure of, but with my griffen rad stood up I'd think that my port is in a higher position than stock. I'd have to measure and pull out the old rad to be certain

1BADAZZSS

iTrader: (23)

Drill and tap the top side of the water pump and insert a npt to hose barb. Problem solved

drumbo87

iTrader: (4)

I have read without of coolant crossover in the rear air can I believe collect in the back of the motor near #7 and it gets hot...... I could be wrong, I'm sure others will chime in. If that is the case get a 4 way coolant crossover from a 97-99 Corvette ( this will only work with some lsx intakes)

gimmeluvin

iTrader: (10)

Hmm i like this idea. Where on the pump do you drill? Got a pic?

JAX04

iTrader: (17)

Straight down on the top radiator/hose port of the water pump, on the ls1's their is a round flat spot, directly above where top hose goes, drill and tap their

ALSO< The truck motors have a 4 port steam vent setup from the factory as well.

gimmeluvin

iTrader: (10)

Thank you.

westtexasbuff

iTrader: (40)

I plan on making these custom water vapor lines in about 2-3 months for those that are interested. I have the same setup on mine.

So.jerZ-28

iTrader: (20)

nice routing... but I have used those gaskets before...and THEY SUCK!!!

The Alchemist

iTrader: (19)

I'm not 100% certian either, but am a victum of the dreaded dead #7 ringland. I actuall broke both of the top two ringlands and did it on a cold day and never saw knock.

LilJayV10

iTrader: (39)

You can use two LS6 crossover pipes. One in front, on in back, connect them with a T fitting to go into the stock location. When I did my FAST intake this is what I did. Cheaper than some of the aftermarket stuff out there.

I too have wondered about the #7 problem. I had always assumed it was because the way the intake was designed.

quicksilverado

iTrader: (8)

Not true. Even when guys have reversed the intake on track setups, they still have issues with #7. Firing order does not help either.

AutomagicLS1

iTrader: (18)

you'll crack #7 hole if you dont have the rear steam tubes hooked up.