>>>*On the passenger side of course the chain does ride on the curved guide, on the driver's side there should be a tiny amount of clearence at all points.

In other words, the straight guide can even barely brush but should not deflect the chain.

*When using the OEM style nylon guide, it is fairly forgiving and just moves out of the way, using any aftermarket steel gaurd it is important to get the rail aligned squarely. Since the holdown bolt holes are drilled off a casting pad template they can vary slightly as to location from one engine block to another.

*Sometimes mild adjustment of the holes in the guide itself are helpful in getting it just right....*EB