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

 

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"

 

^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.

 

Thanks for the quick response.

 

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

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

 

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.

 

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

 

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.

 

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

 

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

 

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)

 

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

 

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.

 

Thank you.

 

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.

 

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

 

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.

 

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.

 

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

 

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