The threaded portion of the holes are probably full of paint, rust, whatever. Were there bolts in them previously, or were they open to road gunk? I would run a 5/16 coarse tap thru them and move on.

Last edited by klhansen; 03/31/2021 12:53 AM.

Kevin
1951 Chevy 3100 work truck
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1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car)
Busting rust since the mid-60's
If you're smart enough to take it apart, you darn well better be smart enough to put it back together.