Try our new info resource - "Aladdin's Cave" (Main menu)Just added a separate link to Ash's Dropbox thread (shortcut)
If you look in the title it sez 500-550
OK but the 500 Big Bore is 550 2nd oversize which is what you are looking for
I might be able to dig out a matching set of barrels and pistons that are not badly worn. I am due a clearout and the coffers are somewhat bare.
Will do. I take it it is non urgent, if you are going the re bore route on what you have on this engine?