Piston question

And I didn't realize you didn't know what quench was. I never saw you ask....might have missed it so I assumed you knew.

Mopar open chamber heads are NOT quench heads to begin with. That's why making a Mopar engine a quench engine with stock type heads can be an expensive proposition. Since the flat part of the chamber is recessed, that's not productive for quench.

Look at ANY Chevy 350 head. Every DAMNED one of them was a quench head. Even the open chamber heads. The difference is the chamber on the Chevy heads is not the full circumference of the cylinder bore like the Mopar heads. There's no recess where the flat of the chamber is, opposite the spark plug like the Mopars, so it's VERY easy to get quench on the Chevy. Lots of them had quench from the factory, as most of their HP engines were two valve relief pistons with close to zero deck height and they all used the steel shim head gaskets early on.

So yes, quench distance is the space between the flat of the piston and the flat of the head opposite the spark plug. That's why I normally just ignore quench on a Mopar, because they are NOT quench engines at all to begin with using stock heads. Get it? It takes a LOT of work to get them there using stock type heads. That's why it's really best if you want a quench engine with a Mopar to get heads and pistons designed for quench.

But good God almighty. That's a lot of work and $$$$ for way less than 50 HP difference in the long run. It's just not worth it. Not on a build like yours. But as I said, it's your decision your money and your project.