It looks like we need to do some more bending of the 20-years-of-service rule if we are to include any of Soichiro's screamers in this series, because Mr. Honda didn't believe in using the same boring old engines for decade after decade, and his company seems to be continuing that policy after his death. The DOHC Honda B came in a variety of displacements from 1.6 to 2.0 liters, with or without VTEC, and powers sedate commuters and tire-charrin' monsters alike. The availability of aftermarket hot-rod parts is overwhelming, and do we need to mention the reliability? Damn, now I need to get me a B18 to drop into my old D15-powered Civic! [Wikipedia]