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Originally Posted by NoHaveMSG

It's a long read, but the info is in here. I think our rod to stroke is like 1.2:1 or something. I can't remember.
https://www.ft86club.com/forums/showthread.php?t=63901

Yep, that's stock, 103.3mm rods / 86mm stroke. On the HKS spec sheet they are using a custom rod / 90mm stroke but they don't give the actual rod length so we can't figure out what the ratio is in the upgrade. If they're able to counter the math a little by going with a slightly (5mm) longer rod that would bring the ratio in line with stock and you'd be no worse off.