Stan, you're right, George's glow plug is for 'oids with no CS valve, but a plug where it once was. If I had an original engine, I would pull the valve and put in the glow plug.
My glow plug died a premature death (went open circuit) yesterday. Without it, I just flat coudn't start my engine. Too cold and 5600 feet elevation doesn't help. That plug sure spoiled me!
I found replacements at Autozone for $11 each. Now I've got some spares.
Best Wishes,
Bruce M
Metro 6/1
Snowflake, AZ