reversion is a product of valve overlap, when the exhaust valve is closing and the intake valve begins to open there is a pathway from the top of the air inlet to the tail pipe
with a common plenum there is likely another cylinder willing to swallow the reversion before it can get past the throttle blades. you have reversion x 8
check this out, beware the fuel vapor cloud http://www.hotrod.com/articles...anifold-tech-engine/
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