..lots of guys trash talk these heavy old school forged pistons (L2316-30)
..How much difference will lighter, newer style forged pistons or hypereutectics make?
I have a set of these and I'm planning on using them. L2316 and @ .030 over as well. Lightly used. Price was my main consideration on them and they were 100 bucks and no shipping charges because they were local. Piston travel/speed in a 340 is lower than in many other mills (chev 327 and 302 are exceptions) so heavier slugs may not be as much of an issue. Maybe lighter pins, if there is such a thing will help some as well.
If price is a concern for you, then I'd use them. Especially if you already own a set. My understanding is that they worked well back in the day despite the weight so I see no reason to not use them now. I plan on doing so... Eventually.
Hyperucraptics.. No thanks. And even they are a bit pricey.
Paul
Edit: Mine are actually 2332P 030 but researched the crap out of them and they cross to 2316's.