My '66 912 had a 1600cc VW Type 1 motor in it when I bought it, and will have a 2110cc stroker VW Type 1 when I finally finish it's restoration and get it back on the road. I decided to stick with the VW engine because having owned 2 Beetles in the past as well as helping my brother rebuild his '66 Ghia, I'm pretty familiar with Bug engines. Parts are much easier to find, cheaper, and the Type 1 does indeed slip right into the Porsche 901 transaxle-even the (12v) flywheel ring gear meshes with the Bosch SR17X starter (same as most Type 2 Vans.) The mounting bolt pattern is the same, but you do have to use a Porsche 912 throwout bearing. I just figured hey, I've already got an engine I know, it fits, building a 150+ hp 2110cc stroker will still end up being cheaper than a stock (90 hp-maybe) rebuild on a 912 flat four, and with a 36 HP fan shroud and dual Webers, very few people are going to be able to tell the difference-and hardly anyone will care. You will have to do a little fabricating to use your stock heater valves, and probably a new, universal throttle cable. The rear mount will take a little work, since the only VW's that used a rear engine mount were the Type 3's-but most cases have the bosses already drilled and tapped for the mounting bolts, so it's no big deal.
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Clay Mcguill
www.geocities.com/the912guy