the large gear that's attached to the camshaft has two holes in it where you can pass bolts through that thread into the block. The small gear that's attached to the crankshaft is solid. No holes. If I'm not mistaken, the service manual shows a 3-jaw gear puller being used to remove this gear. Does that help?
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'50 Chevy Fleetline DeLuxe ('55 235)
'48 Chevy Fleetmaster coupe (late 261)
Chicago
