Newbie from UK needs help choosing engine, please help.

Thanks to both of you. A stone just seems like a really obscure thing to choose for a unit of measure but who am I to say? It was just one of those couriousity things that has been in the back of my mind for the last thirty some odd years that I never thought to research...Kelly

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I'm racin' Spitfire, turnin', poppin' wheelies, burnin' evil chasin' pop,pop, pop,pop,pop.... (The Pixies-Tony's theme)