earlier today a friend and I started my b16 turbo project, first putting on a new head gasket, timing belt, clutch and block guard. ran into a little problem though. the block wouldn't seem to go all the way in. one side would go in a little farther than the other. i've heard they need to be machined and others have told me they don't need to be machined in. also would it be that bad to file the outside of the block guard a little to get it to fit better? anyone with any incite would be greatly appreciated. so far that's the only problem we've run into and hopefully it will stay that way.