I call BS on the compression. I personally talked with wiseco engineers an my builder and they both said you would have to take nearly 4cc's out of the combustion chamber. If using a stock headgasket and standard deck. But! If you ordered the pistons like I ordered. They have 7.6cc's of dome and 11.2:1 compression and that is the highest they can go. From there they say you run a zero deck and 47.5cc's instead of 49.6(stock), then you have 12.006:1 static compression.
Sorry man I just can't fathom you just buying 12.5:1 comp pistons for the Z. They don't exist.
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