Severely rusted/frozen motor case screws

[calvin]

I really have no idea what to call these screws. There are four that keep the motor housing closed, and are about 8" (didn't measure) long. The bottom two are severely rusted and now stripped pretty badly because I'm an idiot!

The shopsmith I picked up had been left outside for the winter in Massachusetts last year (maybe longer, I don't know) and has suffered some really bad rust in the motor pan as a result.

I'm pretty lost on how to get this baby apart to clean it. I THINK I can just snap these motor case screw heads to get it apart and chuck them in my drill to remove them. I've been PB blasting them for 2 weeks now so I'm thinking I've run out of viable options.

Any help would be awesomely appreciated!

EDIT:
Are these motor casing screws (bolts? naming??) standard items? Where could I get replacements, in case I need to go the destructive route?

Pictures below:

Rusted motor pan for reference

IMG_20160102_211235679.jpg (735.2 KiB) Viewed 1295 times

Left SOB

IMG_20160102_211215476.jpg (509.9 KiB) Viewed 1295 times

Right SOB

IMG_20160102_211207865.jpg (578.83 KiB) Viewed 1295 times

[billmayo]

I have found the Harbor Freight 6 Bit Impact Screwdriver Set With Case
item#37530 $8.99 has worked for me on rounded out screw heads. I buy my screws from http://www.mcmaster.com/#machine-screws/=10ijdv4. They have up to 12" in length in zinc plated steel. A steel chisel (Industrial Punch and Chisel Set 12 Pc Pittsburgh - item#4885 $11.99) can split the head off these screws.

[calvin]

Thanks Bill, I'm going to do just what you said. Those screws from mcmaster are a godsend!