YES, DEFINITELY GET AFTERMARKET PISTONS. There :chuckles: . Seriously though, stock B20 pisons are far from optimal when used with a vtec head. First, the compression is way too low, second, the valve clearances aren't designed for a vtec head, and can cause problems.

Given your setup, I'd spring on a set of aftermarket pistons AND rods. If you really want to be able to take advantage of that head (and the CTR cams), you'll want to rev the motor higher than the stock B20 rotating assembly will alow. Also, to get the most power out of those cams, you'll want compression somewhere in the 11:1-11.5:1 range.

If I were in your shoes, I'd do a bottom end rebuild. I'd have the crank balanced, use new bearings, get some aftermarket rods (Import builders, Probe Ind., and Cunningham are reputed to be the best N/A rods, and they should all come with ARP rod bolts), and some aftermarket pistons in the ~11:1-11.5:1 range. The make of the pistons themselves isn't as crucial as the make of the rods. JE/SRP, IB, Wesico, etc, all make pistons specifically designed for the crvtec, with appropriate valve clearances and compression ratios, etc... One thing to keep in mind is that if the pistons are designed for a crvtec with B16A head, you're compression will be about 0.2:1 higher than the advertized compression because your gsr head has a slighly shallower combustion chamber (so for instance if the piston says 11:1 for B20 w/ B16 head, your actual compression will be 11.2:1)

But an new rod/piston combo along these lines should allow you to safely rev past 8k and get the most out of your cams... After some dyno time, I wouldnt be suprised if you were making close to 200 whp after that work