Join Date: Dec 2000
Location: Willow Park, Texas
Yes it will make a difference. The concave side of the washer fits against the radius of the bolt head where it meets the bolt shank (for stregth). If the square inside diameter is against the bolt head it can bind and stress the bolt into early failure. This is a proven method with the aviation industry as all stressed bolts are made this way. That is why the washer's are called AN Washers (just like braided line fittings).
Sometimes you can tell if the washers are installed incorrectly by looking for a gap between the bolt head and the washer. But this is not a fool proof method. There is only one way to be 100% positive about the correct installation if there has been doubt. Take them out and check.
67 CAMARO R/S CLONE, 355/turbo 350, 200hp NOS,12 bolt,etc...