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I have a 1999 GMPP catalogue that lists it as GM part No 14093643 with the following specs:- Duration In/Ex 294/294 @ lash point. 202/206 @ 0.050".
Lift with 1.5:1 rockers 0.403"/0.415". on a 115 degree LCA.
My 87 shop manual just lists the lobe lift as 0.2733/0.2820 (in/ex) which dosen't exactly tally up with the above.
Hope this helps. :steering: