I am building a 402 and I am stuck with the crank gear. I am using the roller set that came with it from TSP. My crank is grooved and my crank gear is grooved, but is there a little piece of metal that holds the two together? The roller set doesn't have this piece and the stock gm crank gear doesn't have it either.

 

Looks like you need a woodruff key. Check this link:

http://en.wikipedia.org/wiki/Milling_cutter

Scroll down to the bottom, you'll see what they look like, just a little semi-circle. Pretty common, you'll just need to get one the right size.

 

Thanks for the help, now I can continue my build-up.

 

Bump: This is a testament to the usefulness of the search engine =) Ive been trying to figure out what this damn thing was called for an hour.

-Lurius