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A friend of mine has a 70 Nova with a small block in it. It has a MSD distributor and a 6A box.

When the car is started the timing will be around 16 degrees, once the engine revs up and then back down to idle, the timing will be around 25 degrees. We checked the distributor for binding and put in heavy advance springs. There is no vacuum advance. Any ideas???????
 

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Advance Problem

Two things to check:
1. Some race setups have a retard at start (called a starter saver that does exactly as described. Sometimes they are accompanied by retard chips.
2. Distributors have shims in between the driven gear and the distributor case to keep the gear from moving up and down which effects your timing as described. Check vertical movement of the distributor's gear in rerlation to its' case. If it's more than .004 - .006 you should shim it to obtain these or similar specs; this will stabilize your timing.

Good luck,
Ron D.
 
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