Brett
The Tiger Crankcase you Discribe is part of a specially Modified Victa Engine. In the Book I have here, which is a Genuine Victa Product Catolougue and parts manual. from 1955 to 1971. Victa called the tiger engine part of its "Industrial" Engine Range. (Must have been special order) There where 2 models a Tiger Standard and a Tiger Super The Tiger standard had 2 different Crankshaft options, Revised crankcase, and different magneto. The Tiger Super had different air cleaner, Crankcase Bolts, An "Amal" Carby, Magneto, And HT Lead.
Hope this Bit of Information Helps.
Regards Ben
[This message has been edited by Ben G (edited 27 April 2002).]