Posted by oldproudvet on January 29, 2014 at 06:08:49 from (208.123.21.114):
In Reply to: 430 tune up posted by brian stanek on January 28, 2014 at 18:52:48:
All they're asking is that you time at maximum advance. Much more accurate and important than static or timeing at idle. That rpm is where the engine is working, cylinder pressures the highest and timing most important. This method eliminates wear and sluggishness with your centrifical adance unit in the distributor. Idle speed has no loading, lightest cylinder pressures and you'd never catch advance problems. With your timing light watch the advance move smoothly up to max advance at 1750. If it's not smooth, pull the shaft out of the distributor and closely look at it for wear and gum (most common). Being able to run it on a distributor test machine is really neat. No one does that anymore. Some of us older pharts keep this test eqpt and it's invaluable with our older stuff.
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