X2 on innova mine stopped working after 3 uses,Ģ0 degrees initial is a lot are you sure your distributor only has 11 degrees mechanical advance?Īnyway like old cutlass said if your dial is at 0 thats your actual timing on the engine timing mark. I was a bit disappointed in the performance of the 455 set at 10 to 12 degrees after all money and energy spent. Not sure at all how this last step is done or what total timing would be. Check vacuum/total timing (setting the timing light to 31 degrees of advance and revving to 3000 rpm?). Once the mechanical advance is sorted out, reconnect the vacuum advance to the distributor and to a manifold port.ħ. If the mechanical advance reaches 11 degrees to soon (what rpm?) It needs heavier springs, too late (what rpm?) it needs lighter springs or the weight bushings need to be reamed out.Ħ. It is my understanding mechanical advance should reach 11 degrees if the timing light advance is set to 20 degrees and it should reach 11 degrees at about 3,000 rpm. Rev the engine (gradually?) To determine if and how the mechanical advance responds. The timing should read 0 on the indicator plate?Ĥ. Once initial timing is set to 20 degrees, reset the timing light advance to 20 degrees to check mechanical advance. (Do I set the light so the digital readout says 10 degrees? Never used a timing light before not to mention an adjustable one).ģ. Adjust timing light to 10 degrees advance so at 20 degree initial timing the indicator plate will read 10 degrees. Disconnect vacuum advance from distributor and plug port.Ģ. Please let me know if the following steps are correct:ġ. The block is a 73, E heads, shallow recessed head pistons, unknown cam (not super choppy but more than stock). I wanted to confirm this procedure for a stock points Oldsmobile 455 with a GM HEI distributor. My engine swap is finally done (I hope) except for adjusting the timing and checking the advance.
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