distributor cap questions

[hooD]

So what is the best distributor cap to use, A B or C?  And does it make a difference?

A.  aluminum contacts inside
B.  brass contacts inside
C.  copper contacts inside
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And why do the newer caps have the extra button on top?  The old caps had just 8 plain old towers.

newer


old school

[72cudamaan]

Larry, you want a cap with brass contacts. The aluminum contacts corrode very easily and are junk.
The extra "button" is actually a vent. Fine to use if you're not needing original look.

[Chryco Psycho]

Copper , brass , alum from best to worst
 the vent releases ozone

[burdar]

For your car Larry, I'd use the MP one even though it has the vent.  It looks more correct then a black one.

[dodj]

Who sells caps with copper tower contacts. I've never seen one. Dealer caps are all Aluminium. 

[hooD]

Who sells caps with copper tower contacts. I've never seen one. Dealer caps are all Aluminium. 

Scott....Autozone does.  part number CR2200G Copper towers with a brass center for the rotor.  $24

[dodj]

 
Thanks Larry, I'll have to look up an Autozone this weekend when I'm down in Minneapolis for the car show.

[hooD]

installed the new copper cap and rotor.  the difference is obvious.