Originally Posted by DADS50
if you want to advance 5 degrees set the dial to 5 advanced then point at timing light and you should see pointer on ball.

OK, the book says for the 261 it should be 5 degrees BTDC. How do I do that with the timing light I have? I don't fully understand the BTDC and ATDC as it relates to my vintage POS light. Also I didn't have a vacuum gauge but just bought one like yours off ebay for under $20. So once I get the gauge, what is the vacuum I'm looking for at idle?
I'm pretty sure the advance is working but I'll go check it right now. I'll also check the valves.

Bruce


My Trucks
Stuff I Collect
If it doesn't matter if you win or loose.......why do they keep score?