Note there's 1/32" difference in centre main journal width between an S, and all the other 1275s.
if you put an S crank into an 1100S or LS block you need to surface grind the back of the thrust washers down.
But if you go the other way (1100S crank into S block) you need thicker ones. Hard to get now as they've stopped making .030" oversize ones.

_________________
DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.
