MOT Consultation - 40 Year exemption.

[Bob Culver]

Power will increase in close proportion to the capacity increase and also but in lesser proportion to the consequent cr increase. Boring to .060 increases capacity 5% and cr near same, but only further  2% or so power gained  due the cr component of the increase.

(which in part explains why many supposedly stock Sevens seems to do so much better than the original road tests)