So Im looking for flywheel bolts to use on a stock (OEM) Oldsmobile flywheel - 1967 330 engine. Yes flywheel, not flexplate.
I usually like ARP fasteners for critical areas but if one reads the ARP instructions for their flywheel bolts it says "make sure there is
adequate chamfer on the flywheel holes to accept the radius on these bolts". I dont see a chamfer on the OEM flywheel holes.
Anyone know if this is an issue?

 

All I have seen use star? type washers under bolt head so a chamfer doesnt come into play.

 

yes I've seen this also but ARP says Don't use washers it will void the warranty on their products. Maybe I'm being too OCD

 

If the flywheel holes are indeed not chamfered, use a chamfering tool in a 1/2" drill to lightly do so. Also, ARP has several lengths of 7/16x20 flywheel bolts listed for different applications. You want ones that don't protrude too far from the crank and hit the block or oil pan flange.

 

will do thanks