spark plugs / distributor

hi Again

as you can see from the other Topic (rough running) over the past few days im having problems with Betty

i have the smaller nutted spark plug in Betty (sorry didnt know how else to explain them)
how am i ment to know what plugs should go in my engine does it go on engine number ? although i have the smaller ones in dont know wether this is right they look quite new.
my distributor is the one with the cap with the cut out of it and the securing clips that are about 3 inches long is this the 25d type ?

the two types that speedys list for plugs RN9YC + N5 which is the smaller ones ?

Cheers Amos [8D]
 
small hex plugs are for installing in engines with tight spaces, so why they are in your commer i cannot see , it does not matter either way as its the heat range thats important. n5 or n9y is a normal hex size and recommended or ngk bp6es.:)

"you were only supposed to blow the bloody SLIDING doors off no.3"
 
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