I've been on the fence of spraying the Mustang because of the pistons. It's a carb'd LQ9 with stock bottom end, but the pistons have been fly cut (a bunch)

I've talked to two different N2O companies, one says I can get away with a 100 shot, the other said "buy pistons" lol

I was looking at someone else's thread and saw their aftermarket pistons and noticed the valve relief is very close like my stockers.

Here's pics of mine and the aftermarket. Just wanna spray a 100 shot, car has been 10.50's @ 128 on motor, was hoping to put her in the 9's.

 

How thick is it right there where they fly cut it?

 

Do you mean of what's left between VR and edge of piston or actual depth in center of VR's? It's .055" to the edge, but I have no clue on how much depth is left, I do know the VR's are .200" deep in the center though.

 

I wouldn't be worried as much about that eye brow, just make sure the piston is free of any sharp edges, especially right there..
I was asking about total depth left in the valve relief.. As an engine builder I would advise getting new pistons for next season, if you were trying to go out and run 9's by the end of the year I would say you would *PROBABLY* be ok.. But I would definitely not advise going out and making 100 runs on it!

 

If you get the tune up right and don't detonate it, it will probably be OK. If it were my own I would do it, but I am comfortable with tuning and would be OK with fixing it if it burns or breaks.

As for the aftermarket piston, just because it is aftermarket or forged does not mean it is a good piston for nitrous.

 

The better question would be how thick the piston is stock at that point and then subtract the .200 you said was removed.
I had .100 taken out of mine (LQ4 dished stockers) and forgot to ask what was left also

 

I don't remember the thread, but I read on here somewhere from a guy running nitrous who had flycut his stockers and the piston broke around the edge the piston at the flycut exposing the top ring.

I couldn't say if it was detonation or just a weak spot in the piston.