Stock 540 bulldog running at 4000ft elv.
The timing tab has no number markings, only a single white mark that is located two peaks in from the right side edge >>>>>x>>. Is that 0, 8 or 12 degrees?

After reading the forms the popular total advance is 33 to 34 degrees, sounds good?

Thanks for any help.
Bryan

zero or tdc is always the biggest longest hash mark on every big and sbc ive ever set the timing on. you will need a timing light with adjustable advance

All the hash marks on the timing plate are all the exact same size. I do have an adjustable timing light.
I’ll go stand on my head tonight and see if I can see any other imprinted marks besides the white dot, hope to see something.
Anybody else have any info would be great.

The deepest indention is 0*. Each peak/point thereafter is an aditional 4*.