RE: vvrc 40cc twin
I've emailed Tom at VVRC and he will exchange the engine. But he stated the plugs (and I assume caps??), are straight, so the width may be >9". He also stated that the smaller plugs will not last as long as the CM6 will. I expect the CM6 plugs and CDIplug caps will add weight. The smaller plugs and plug caps result in a very compact look especially on top of these rather small heads.
For those interested, the option is something you choose on-line. I simply missed it and now have to go through gyrations to get it fixed. A real PITN
Whatever..... it's intriguing enough to spend some development time to figure outa good set-up. Mine will be soft mounted and piped, as all my stuff is. Tom said that my typical BelRay MC1Avgas mix will be fine, which was expected....