Pistons specs question for 340 build

33IMP said

The -5cc pistons are likely flattops with a five ccdeep valve relief. The -16cc are likely dished. You will need to have the compression height of the pisons (measurement from center of piston pin to the flat part of the piston head) to have a vague idea of c.r.
There are a bunch of ACTUAL measurements that need to be done to get an accurate c.r.

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Thanks, you are right, I looked at the DSS website, One is dished (must be for turbo & supercharged applications?) and the other is flat top which would have those valve reliefs. Summit Racing has it listed as -3cc but I assume that's a typo, DSS site says -5cc.

Does anyone know if the DSS FX1 forged are lighter than the KB HyperEu's? I wish they would list the weights and I'm also disappointed that they don't offer a domed piston to Chrysler people. That would be much easier way to get up the CR than go through the milling process.

I suppose you have to get custom pistons made up at expense if you want things like that, 'cos for Chrysler 340 there is only limited off-the-shelf stuff for pistons.