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AngM018 AngM018 is offline
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Join Date: Oct 2006
Location: Raleigh, NC
Posts: 760
BTDC= before top dead center (when the light hits one of the marks to the right of Z1 at the fan housing)
TDC= Top dead center (when Z1 lines up with the mark on the pully, as the light hits it)

If you have a timing light with advance, then just punch in the advance value and the light should hit when Z1 is lined up with notch on fan.

You may also want to consider going for a more aggressive cam if you do swap them out. SC's may be a little watered down for your set up.
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John A.
1979 Porsche 930: 3.4L, SC cams, Twin plug, Leask WUR, Custom SSI turbo exhaust, Tial WG, K27HFS, and we can't forget the Zork (short lived depending on my homeowners assoc.)
05 Boxster S: For the Track.
06 Dodge Ram 2500 Power Wagon: Tow Vehicle

Last edited by AngM018; 11-13-2007 at 04:23 PM..
Old 11-13-2007, 01:51 PM
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