I threw in my two cents...hope Dr. 914 doesn't get mad. I had to stick up for the 912 owner.
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Scott,
I am also a 912 owner and I am also going the route of putting a type-4 in it. It is not very costly to do, but the type-4 motors are not particularly cheap.
I have two options for you.
1. Get a type-4 motor and put it in your 912 and I will help you get it all installed.
2. I am rebuilding my original motor and I am going to sell it. Unfortunately, it is going to cost a bit more than a grand.
You should check out my website, I have a bunch of pictures of 912's with type-4 motors and type-4 motors in bugs. I also have a bunch of pictures of my car. www.britainsmith.com
Last, you should check out www.914world.com for you questions...you will get straight forward answers and maybe even find a type-4 motor for a good price. There are a whole bunch more people who will treat you really nice.
-Britain
By the way, where are you located?