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Distributor Advance Curve
When you buy the Mopar Performance upgrade kit or electronic
distributor they tell you “it has a performance advance curve”
but they do not give you the specs. I’ve been looking for this
advance curve information for a long time and finally came across
some useful information that should apply to most Mopar distributors
50’s-70’s if not all as the design seems the same. See
page three of the attached Summit Racing instruction page.
I found the hemi likes
28-29 degrees of total advance, and the advance is all in by 3000
RPM. If you set 10 degrees initial timing you need 18-19 degrees in
the mechanical advance. The problem is that new distributors might
have more advance than that and you won’t know because they
don’t give you the specifications. If you put more advance in a
hemi at high RPM you risk detonation. A new distributor with no
information on the advance curve is mayhem.
For reference, here is a link to distributors used on Letter Cars, specs and advance curves.
John Grady
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