13:1 Compression Pistons in 340 Small Block

Garrett Ellison said

Best answer yet! A set of lightweight pistons and a longer stroke crank (3.58-3.79 with J heads) makes a whole lot more sense and will live a whole lot longer. It will also do it without making you have to grab your ankles and smile in maintenance and fuel costs. The overkill street builds are fun for a while but are pretty useless as any kind of driver. It will grow old quickly and you’ll be looking to detune it to make more of a driver out of it. Seen it many times.

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The OP didn't want a Stroker. You guys can spend money for nothing right quick.

Bob weight is overrated. By a long ways. He can get a different piston, but it will be hell to get quench. I'd have to pull my bob weight card, but I don't think my Pistons were anywhere near 850 grams.

The point is...the OP has the Pistons. There is nothing wrong with them. In fact, I can make the argument that he may be going backwards buying a newer piston. Especially if that new piston isn't designed to come out of the deck.

Old doesn't mean bad. New doesn't mean good.