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Has anyone used flat top pistons for a Chrysler 3.0 rebuild? I Know Mitsubishi used a higher compression piston during the early 90's, but I'm not sure if they were flat with absolutely no recessing? I'm looking at rebuilding my Daytona engine again this winter and wouldn't mind trying the flat top (optional) pistons available in the kit unless somebody knows they will not work. Again, I'm looking for someone that has actually done this work and knows how the end result performed. The engine is already .020" bored on my block from the last rebuild so obviously I'm adding a slight volume to my engine and will be increasing the compression using the flat top pistons. In addition, I have some very aggressive cams for flow and fully understand I will be creating an interference engine. Really, I'm just looking for someone that can say they've done this and had no problems or someone that can say don't do it unless you want to replace head gaskets every 10K miles with the occasional connecting rod failure while always running 93 octane gas to prevent detonation even if your timing is set back to stock 12 degrees advance. Again, I'm only interested in real feedback versus theories.

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Running the 10:1 pistons has been done. It does work. As for gains, hard to say since hardly anyone has done a lot of dyno testing on the 3.0 in our community. Knowing what the other versions of the 3.0 were rated at, I would think it would get it up to ~150-160hp (not considering other modifications).

The rods and crank won't be a problem. As for how easy it will be to tune on pump gas...that depends on the cams you've got. Dynamic compression could cause cylinder pressure spikes that might be hard for pump gas to deal with, but it's impossible to really know until you try.
 
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