[AMC-List] Duraspark distributor woes (258 six)

["Swygert, Francis G MSgt 436 CES/CECM" <Francis.Swygert3@xxxxxxxxxxxx>]

Richening it a bit will reduce pinging under load. I've tried weaning
mine off gas at times too, it usually balks.... ;>  Once it's richened
up a little you will likely get better mileage. At 70 mph you should
have the secondary cracked open with a small 2V carb. That's my
experience with the Autolite carb on an old Pinto anyway. I think the
secondary started opening around 50 mph. 

The strokers guys have found that running an 87-90 Renix spark plug in
the 91-06 HO engine (when stroked) will reduce pinging also. The
recommended plug for the Renix is shorter than the HO plug. Don't know
if that info will help or not. I think the longer reach plug is getting
hot and causing pre-detonation, the shorter one doesn't get as hot from
combustion. Just my opinion though! 

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