The above link will provide access to a publication which has long ranked high among the Holy Grails for home constructors of model engines. This is the Motor Boys Plan Book which was developed by the late Ron Chernich and his fellow members of the now-inactive Motor Boys International group of model engine constructors and enthusiasts worldwide.
Although all of the Boys were involved in the development of these plans and the construction of engines to test their accuracy, the primary responsibility for preparing the excellent CAD drawings which record the various designs rested with Ron Chernich. These drawings were compiled into the near-legendary Motor Boys International Plan Book which was sold for some time by the AMA but is no longer available today. It is a much sought-after resource among today's home constructors of model engines - I've had many inquiries regarding its availability.
It was Ron's stated intention to enhance his legacy by making the full Motor Boys plan portfolio freely available to all prior to his untimely demise in early 2014. Sadly however, his advancing illness prevented him from making this wish become a reality during his lifetime.
However, thanks entirely to the generosity of Motor Boy Ken Croft, it has become possible to finally realize Ron's stated wishes. Ken has very kindly made his own copies of the relevant documents available, and I'm delighted to be able to provide the above link which gives access to the material contained in those pages. Our sincere thanks are due to Ken for his generous provision of access to this hitherto elusive set of documents.
A separate link to be found on this site will provide access to the separate set of Members-Only Plans which were made available to financial supporters of Ron's now-frozen but still highly informative "Model Engine News" (MEN) website. Our collective debt to Ken Croft and his former colleagues cannot be overstated. Enjoy!!