Pshaw... been waiting far longer than that.

Rob Gordon (Richard's son, Richard of IPD) uses b21/b23 cranks in a lot of his OHV stuff... not sure why.

I would not run an engine less than 27-28 thou.

I would take a piston and hand-lap it (that sounds, umm...err..nevermind)... figure eights on a piece of sandpaper.

It's extrordinarily easy to machine a crank with a messed up stroke, if you put it on and are convinced that the reason the stone touches on one side but not the rest as you begin is something you need to fix...and on 60's and 70's American, and older yet British stuff, it is.
As far as I know there is only one full automatic crank grinder in Alberta, and it's at AMS in Edm. (A Rottler machining center is actually what it is), and they don't even use it that way.

10.6 is a lot... it would have been more except for the chamber mods we discussed? Maybe my guess was right, that he'd planned to do something with the chambers, but thrown it in the mail half finished.

With the pistons back to where they should be, there will be 35 thou of squish area. It was easier to send them back than to spend a weekend lapping them.



Perhaps he did forget something, and the mods probably only changed things by a fraction of a cc. Funny thing is the combustion chambers were all the same size as close as I could measure (I guess I was pretty consistent). I'm still confused that he made the combustion chambers smaller than they needed to be. With the shaved pistons, I'll have 10:1 static...which is probably a few points lower with valve openings etc. I'm happy with that number and will see how things go on the dyno. I guess a little smaller combustion chamber is better at some point, but not too much.