The ball is the timing mark and the triangle is TDC.

Edit: From the links Tim posted below it appears I had it backward. It is now correct.

Last edited by cletis; 02/19/2010 5:41 AM. Reason: corrected misinformation
"It's just a phase. He'll grow out of it." Mama, 1964

1956 Chevy 1/2-ton 3100
1953 Chevy 6100 "The Yard dog"
1954 GMC Suburban Now with a new proud owner.