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Timing makes No Sense? 33 degrees at Idle

C3 General - forums.corvetteforum.com
Have a lt-1 engine with solid lifters and original NOS cam that was just rebuilt and am trying to set the timing. The car starts and runs (on jack stands) but the timing makes no sense. With the vacuum cannister hooked up, air cleaner off and a vacuum gauage attached these are the reading I get.

Vaccum: 12

timing at idle: 33 degrees BTDC

When I try to adjust the timing (retard) to 9-12 degrees it dies. The engine is warm and the idle is about 750 rpms. How can the timing light read 33 degrees at idle. It is a timing light that can be advanced or retarded so when it goes to TDC the timing light reads 33 degrees????? Makes no sense. Help--what am I doing wrong.


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