Best spark plugs to use? Hi-tec or Standard?

[kach22i]

Originally posted by kach22i
I just removed the Bosch platinum W5DPO plugs from my 1977 2.7L. I have never seen more carbon on any plug - ever. With 6,000 miles on them they looked like they had been in since 1977.

I put some NKG BP7ES plugs in, changed the rotor and distributor cap. I still need to do the timing but a huge improvement already.

At $2.16 a plug I'm going to change the plugs every year.

Photos.

[kach22i]

New verses old-part 2.

[rnln]

Anyone can post the model of Bosch copper cores?
Thanks.

[jpahemi]

kach:
NGK also makes Iridium plugs with the same heat range as the ones you show; they make make a good alternative to the standard "ES" type.

jp

[rnln]

I went to Autozone today after making a call. They have many Bosch which has the copper core, and many NGK starting with BPxxx. I lean over the Bosch since this is a German car. NGK would be my first choice if it's a Japanese car, but there are many Bosch plugs with copper core there. The one their computer recommended is BPRxxx and I forgot the model you guys recommended so I had to run home, got on the imternet to find BP7ES and they do have it for only $1.95 each. Good deal and only a mile away.

Now question on gap. What I found after searching here is between 0.024"(0.6mm) and 0.032"(0.8mm) is ok. Is this true? Any exception?

Thanks all.