B20 Vtec piston questions

[cbauto]

Std bore for B20 is 84.00mm
B16A & B18C are 81.00mm
So no, that won't work.

The talk about the notching of the pistons is because the b-series vtec head has valves 1mm bigger in diameter than the flycuts in the b20 pistons.
Aftermarket pistons don't have this issue

Use CP pistons - part number SC7117 (84.00mm), SC7118 (84.50mm) or SC7119 (85.00mm)
or if you stretch your budget use Toda 85.00mm pistons P/N: 13010-B20-000
If you go oversize, be sure to use a dummy head when bore & hone is done.
You'll need rods with these or modify the std rods (but that's kinda uneconomical)
also balance the bottom end properly (2nd order harmonics kill these engines)

hope that helps

whats your view on Toda 85mm bore longevity on a highly strung engine?
Good for 100k plus km's DD duties?
Would you prefer 89mm stroke or 87.2mm?

Anyone know much about RS Machines 84.00 mm for b20? Are they suitable for turbo?

I would prefer to use b18 if you want to go forced induction.