I did some research on a number of d-series combos, so I need a pat on the back for that. The things that are confusing me are: 1) Using the crank out of the D17 engines, which is a 94.?mm stroke, and using it in one of the D16 engines. Can I do this or not? 2) I was also wondering why the DOHC ZC engine calls for 137hp and the D16Z6 only calls for 125hp. My first thought is the differences in cylinder head flow, but I am not sure. 3) Is there any way that I can put the 94mm crank into a ZC DOHC engine? 4) Last but not least and all bull-$hit asside, which d-series head flows the best? I know all kinds of shit about b-series engines, but I don't know hardly anything about d-series engines.