Optional 9.4:1 83mm pistons

[dr.occa]

In case anyone might be interested - if you plan to bore out a 7 rib block 2mm (total of 83mm) you can use 1991 Miata pistons. They are 83mm with 20mm wrist pins.

[cdixon311]

How much performance do you really get out of boring over that much on the 4a? IDK if 7a & 4a wrist pins are the same but I was reading the honda a20 pins match with the 7a, so they could be swapped in. That pushes it to 82.75mm.

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