Found fix for #7 piston problem

[CHEVROLADE]

Are there really regular visitors to this site that have never heard of the ole number seven issue?

Anyone wants to call me out for making too many posts needs to realize I read all new posts (there's an ap for that LOL) and comment when it helps someone, makes me laugh, or OTHER. This is one reason I know about #7 and other stuff.

Let's not be surprised by ANY elephant in the room.

ok smart guy explain

[DBRODS]

I'm sorry, but if my motor is getting torn down, its getting all 9 pistons replaced with forged, not just #7.....

[cjriojas]

ok smart guy explain

Dont worry about it. Just keep posting UFC vids and you will never have this problem





JFWY

[bud8fan]

the problem with #7 piston is a cooling issue with the way the water ports are made around it...thats how it was explained to me.

[molitor]

i haven't had any problem with no. 7, but my no. 6 piston is noisy noisy. replaced rockers and pushrods, no change, been gritting my teeth hoping it will last until the 5.7L is finished, i'm a very regular visitor (high fiber diet). . . .and i have never heard of this problem

[Maui4x4]

I knew about the #7 piston problem from reading in this forum and others... just was pointing out the fix seemed like a joke.

Btw I think one of the site members has one of those custom balanced "9 piston" blocks.

I'm sorry, but if my motor is getting torn down, its getting all 9 pistons replaced with forged, not just #7.....

[ff_jeff]

I knew about the #7 piston problem from reading in this forum and others... just was pointing out the fix seemed like a joke.

Btw I think one of the site members has one of those custom balanced "9 piston" blocks.

Naw the 9th piston gets bolted on to the block. Its independent. He only uses it for going in reverse. That way he doesnt blow hot exhaust fumes out the intake manifold.
Looks like this

[sprayedenali]

^^^ i thought that was only an issue when using a turbo??

[Sleaper]

^^^ i thought that was only an issue when using a turbo??

This has happened in many different applications, FI, N20 & N/A, with different intakes, stock, LS6, Vic's... and fuel systems, return or returnless. The arguments are as follows:

1) #7 is the farthest back and due to block design doesn't have adequate coolant circulation since there are block offs unlike earlier years that had cross overs.
2) Returnless fuel systems can have trash build up in the fuel rails/injectors since there is not an inline filter and no way to return the trash to the tank.
3) The stock intake design doesn't allow for even air distribution, especially in heavily modified applications, which cause #7 to run lean and not show on a wideband.


These are the main arguments or theories. The problem is failure has occured when some of these are not present. For example, someone is running an aftermarket intake or upgraded fuel system and they still lose #7.
Nothing has been absolutely, 100% proven to be the causing factor that I have read. IMO, I think that it's probably a combination of some of the above issues and not just one in particular. In addition, the factory clearances are set up tighter than what you would normally run in a highly modified set up which just adds another possibilty of reason for failure.

If you have never heard of this being an issue, now you have!

[LARRY01Z28]

I think allen is just joking.