Just trying to get an idea of if its worth the cost of me changing hotsides on the 6262 kit I have. Im on the stock block still and wont be running over 30psi(on e85) with it till its built. Its on a 82 hotside now.... Whats your guys best guess on how much peak power will fall off and for how much spool? Or will peak power even really drop off much since Im not pushing the turbo at that level?

 

Keep the .82, you will gain maybe 30-40 whp over the .63 but lose maybe 300-400 rpm of spool up.
i may be a little off but not by much as ive had a hat35r with a .63 that spooled nicely but
the 6262 with the .82 hits like a freight train. This is on pumpgas 93 and 28-30 psi .