Subject: Re: 2 Litre Flywheel Ring Gear
Dear Alan,
without personal experience: I would assume that 12 bolts and the ring machined so that it is centered without play should be good enough, then there is only shear force on the bolts, I don't see any reason to shrink it on. May be this statement helps to start a discussion or to get confirmation.
By the way I love reading your book: Lagonda Journey - Fifty years of Vintage Motoring