> The 25D4 has the
> "Fine Tuning" feature for the timing?
Yes. So does the DM4, which is an earlier, more complicated (and hence more
expensive to produce) design.
But note that there is a LOT more to these distributors than the model
number. Within each model number, there are literally hundreds of different
part numbers; each with different characteristics. There is a partial
database at
http://goo.gl/wruJQ just to give you some idea of the range of variations.
The differences are important. In the extreme case, using the wrong one can
destroy the engine. Although not caused by the wrong distributor, this
damage was caused by a (inaudible) high speed ignition knock, like one could
get from a distributor that advanced too much at high rpm:
http://goo.gl/54z9U
-- Randall
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