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pgfpro, what cr are you running on your 4g63?
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The engine that's in the car now is at 8.0:1 This is a modified stock 1g piston on a deck block and milled head. I'm using this piston because I wanted to test running in lean burn around 30:1 A/F at medium load 0" Hg to 2psi at freeway speed.
For the racing part I use these stock cast 1g pistons becasue I'm trying to run a high 9 second pass on pump fuel. I did some testing last year and while pushing the envolpe I broke a few pistons when the engine detonated.
When these pistons break they just crack the ring land and drop down in compression, and so far I haven't hurt the bore and or head. I then can drive the car home and change out the piston without pulling the engine in less then 8 hours and be ready to race the next day. i have 8 pistons ready to install at all times.
I have also another 11.5:1 engine I will be testing later this Summer. This is my E85 engine with a built bottom end.