[Terry411]

I have a 75 pontiac 350 out of a Firebird. I have a Comp Cam with 260 Duration. I want to know if I need to drop the distributer in before top dead center or on 0. Any advice would help. Thanks.

 

[Siggy_Freud]

Should set in fully with the rotor pointing at the #1 cylinder post when cylinder #1 is at TDC on the compression stroke. This is 0 degrees.

 

[poncho62]

Put it in at 0 degrees...............you set your advance by turning it a little once in.