You need to take about .016" off standard thrusts to fit an S crank into an 1100S etc block. [edit] I run one.
To fit an 1100S crank into an S block you need thicker ones as Ian said. Use +.030" ones and surface grind to fit. Approx .016" needs to come off. These thrusts are each .030" thicker, not total .030" for the pair.
Don't use the shop manual's .003" end float if going to rev it, the crank webs will flex and grab the thrust washers at high rpm.
A recipe for overheating the centre main. As I found out once at Wakefield Park on a 1000 mile fresh rebuild. I use .007" now.
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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.