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Old 03-26-2012, 12:05 PM
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When the mechanical advance is locked out the timing does not move at all.

How could you have locked out the timing and have 14deg initial and 36deg max.?
Thats not locked out .

Get someone who has a clue to set up the distributor curves before you damage this motor.

Its very easy to lock out the mechanical advance curve on a HEI.
Once its locked out set the fixed timing at 34 to 36deg BTDC at idle.
It does not advance with rpm, when "locked out"


Its also very easy to limit the travel of the mechanical advance system
for hi perf cams that want a lot of initial timing at idle.

Its possible you have the vacuum advance system set up to peg at a low manifold vacuum reading. This causes added advance when ever manifold vacuum is anything higher than atmospheric. This is not set up right.
Vaccuum advance is for cruising at part throttle. You likely have it set up so its all pegged in at idle. (vacuum advance diaphragm spring tension way too low)

Last edited by F-BIRD'88; 03-26-2012 at 12:17 PM.
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