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> This is measured round the max circumference of a T3 pulley starting at the centre of the TDC notch, which on my original '64 pulley is a smooth curved notch. The other timing marks on my '64 pulley are 3 'T shaped' grooves cast in it just over half an inch to the right. The left hand one is 7.5 degrees, the second is 10 degrees and the third is 12.5 degrees. > If you just go 3 times the distance from TDC to 10 degrees BTDC, you get 30 degrees BTDC. Mark this and never set the timing more than that! Dave. UK VW Type 3 & 4 Club http://www.hallvw.clara.co.uk/ ------ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~