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those plugs are quite crusty ..
but the gaps were pretty good [measured and adjusted] minimal erosion and the electrode clean ..
this machine is a 1979 came with emissions & catalytic converter .. NO-Lead Head from factory ..I never had the head off
be sure i'm looking at those plugs quite often, In-fact since i added some Snake-Oil "Restore" to the sump i have been checking cyl compression ever tank of fuel.
its just back in service after Hiatus for coachwork.. im still looking for a baseline , trying to burn off the initial add of *soup* to the top jar and get baseline wit MMO[mystery Marvel Oil] dripped in the intake ..
it is interesting to me that after the addition of the Top Jar i was UNABLE to get any *ping* even with the timing way too far advanced[60BTDC !!!!!!!]
i tried to set by ear and was unable.. had demonstrated good success using that methodology previous ..
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