About Rover etc. engines-
As an old rev head and hot rodder, I'm very familiar with the alloy V8 Rover.
It started life as the Oldsmobile Rocket in 1951. Revolutionary - all alloy, OHV and about 450lb with clutch - Ford V8 of that era SV and 630lb with clutch. Rover used the basic block for years, but its finest moment was when Sir Jack Brabham persuaded Repco (Oz car parts mfrg) to turn it into a 3L F1 engine. They did a pretty good job, JB won 2 F1 world titles and his team mate (Denny Hulme) won 1 in the late 1960s. (I know, most of you readers weren't even a dirty thought then!!!). Leyland (BMC) in Oz used the block in the ill starred P76.
As you can imagine, they were a gift from Heaven to a hot rod builder of the 1960s - they cost the earth, though. Oz mechanics had little idea about care and feeding of all alloy engines so many suffered badly from corrosion due improper coolant.
Now, let me think - what was this thread about!!!