I found a book on how to port the yb head. I have access to a machine shop. I was going to do it myself! Apparantly as long as I don't go down more than 2mm on the exhaust ports at the bend Its all good!

Anyone done this work themselves, anyone got good results!

Plan with bottom end.

Pinto crank, because its lighter big end ground to suit -> 1800 diesel conrods, width machined to suit, Should give extra 3mm up the bore. Will be able to skim this off piston crowns, machine in valve cuts. Am working out compression ratio (nearly done 3d model to help calculate). Any obvious problems, or have I found an easy way of making a high reving n/a cossy?