Had one person tell me today that all Sandmans were 5 litres, and another bloke tell me that the model number defines it as a Sandman, like the "D" on an SLR/SS Torana tag.

Managed to convince one that they had 6's and 4.2 litre engines as well, but the other guy was adamant, and actually came to this site on his phone to find the info. Needless to say, he didn't find it...