'99 Tahoe 5.7L, Timing Marks? (Page 1/1) hdryder JAN 06, 02:46 PM I want to check the valve adjustment on my '99 Tahoe 5.7L. Are there any Timing Marks and Indicator on this engine? If not, how would I be able to locate TDC for cylinder #1? Thank you for the help on this one. thesameguy JAN 07, 11:45 AM There are timing marks on the crank pulley, yes.