How does ignition timing work on a Chevy 454?
Fuel takes a certain amount of time to burn. As the engine rpm increases the time the fuel remains in the engine decreases exponentially, thus ignition timing is advanced to allow more time for combustion. Mark the timing mark on the harmonic balancer with the white marker to make it more visible for the timing light.
Where is the advance spring on a GM 454?
There is a mechanical advance spring set up under the distributor cap. Also, unless the engine system has been updated; there is a vacuum advance unit attached to the metal base under the cap. The top item is to replace ALL the vacuum lines.
Is there an ECM on a 1993 GM 454?
There is No true ECM on the 1993 454. There is a mechanical advance spring set up under the distributor cap. Also, unless the engine system has been updated; there is a vacuum advance unit attached to the metal base under the cap. The top item is to replace ALL the vacuum lines.
Where is the compression stroke on a Chevy 454?
Look for the long straight line on the balancer and mark this. Look at the timing plate on the driver’s side of the timing chain cover. Notice that it has a V cut in the center of the marker plate — this is top dead center on the compression stroke.
What are the timing instructions on a Chevy 454?
Chevy 454 Timing Instructions. The numbers to the left of the V, looking at the engine from the front, are degrees of advance or how many degrees before top dead center. The numbers to the right of the V are degrees after top dead center. You always want to have the timing advanced or before top dead center.
What should timing mark be on FMCA 454?
The hard part is to get a good look at the timing mark bracket mounted on the timing chain cover because of the shroud! The setting should be 4deg. before TDC. Forgot to mention that one needs to remove the Vacuum line going to the vacuum advance on the distributor or the timing will not set correctly.
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