Recommended sparkplugs for 1975 2.7L CIS?
 

I prefer NGK's (although I don't have a part number for the 911...) but does anyone have a favourite of their own?

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I believe the bosch number for those is w5dc

if you like ngk you would use bp7es

i like to use bosch wr7dtc. it's a little hotter than the recomended plug. It has three ground electrodes. I don't think that helps...but they look cool.

my true feelings on spark plugs is that it does not matter what you use. the all work about the same.

Except bosch platnum plugs! they suck. I put some in my vw rabit when I was in college. the next day when I tried to leave to go to class the car wouldn't start. the only thing i did the night before (when it was running fine) was change the plugs. so I put the champions back in. it fired right up.