i toyed with casting some time ago.....i started to make a wooden plug for a set of engine cases to take two CR500 motorcross bike cylinders...the aim was to acheive a V twin 1000cc twostroke engine to fit into a RGV250 ...i shelved the project and fitted an RG500 4cylinder twostroke instead...my plan was to cast a mould off the wooden plug and pull a product out....but i ran out of time and it got shelved...the tunnels need to pour the molten ally would have to have been quite intricate