🚀 go-pugleaf

Sorry to those of you who saw this twice - I inadvertently sent it to
net.auto by mistake...

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My '79 Chevy 305 V-8 recently started running rough under light loads -
sort of a miss...  I pulled the plugs to do a compression check and
found two plugs had some white, brittle crud on them.  One was so bad
that the stuff had almost filled the area between the ceramic and the
shell - it had also gotten into the gap.  Ah ha!  Here is the miss.

I cleaned the plugs (which have under 10k miles on them - supposedly ok
for the HEI ignition) and sure enough the miss went away.

What is this white crud and what causes it?  Oil fouling is usually
black; could this be a deposit from BURNED oil?  How about gas residue?
(The car burns unleaded premium.)  A friend suggested bad wires - this
would cause a slight miss leading to a buildup of unburnt gas on the
plugs.  I am planning to change cap, rotor, and wires since the engine
now has 50k miles on it.

BTW, the compression was between 170 and 180 psi on all cylinders; does
anyone know what the spec is?  The shop manual doesn't seem to have it!!

	Steve Falco