warrior Posted May 7, 2012 Share Posted May 7, 2012 Hi All Trying to get my GMC 353 ready for the road after a rebuild, manuals say set the timing at 5degrees btdc is this ok with todays fuel, also one manual says 12 thou for in and ex tappets another says 12thou in and16 thou exhaust any of you gmc chaps found out which is right Regards all Warrior Quote Link to comment Share on other sites More sharing options...
deadline Posted May 7, 2012 Share Posted May 7, 2012 (edited) There were THREE exhaust valve settings. Originally it was .012 for intake and exhaust. It was increased to .016 for 'early camshafts' and .020 for 'late camshafts'. How can you tell if you have an early or late cam? Here is the TM goodness: Edited May 7, 2012 by deadline Quote Link to comment Share on other sites More sharing options...
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