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Well the good thing is you haven't built it yet so you can buy the parts you need to get things right. I don't know what you plan on using for pistons but you should contact one of the board members that is a Diamond WD to choose which piston you want , if it's a shelf stock piston you can go semi custom for a small up charge and get it with the pin move and possibly a small D dish to give you a pump gas friendly compression ratio and take advantage of SQUISH

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These are the D-dish pistons I use to have 10.6 pump gas friendly comp on my 493 with the 75cc EZ heads and still have good quench. Ron