I've had to bore several 426 blocks, both street and M.W. blocks to 4.320 and used 440 pistons in them due to to much taper in the 4.310 bores, no problems on any of them shruggy
I did have them all sonic tested first though boring them larger up
As far as strokers and lighters pistons compare to the stock stroke RB pistons weight the longer the stroke and the longer the rod the lighter the pistons get up
Can you say 526 grams with the pins boogie up

Last edited by Cab_Burge; 03/31/21 02:25 PM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)