Plugs need to be replaced. So, I go to Autozone and pick up some AC Delco's. I get home and double check the part number on AC Delco's website and they seem to be the correct plugs. Here's the thing... The terminal doesn't fit in the boot. Now, I seem to recall that on my Honda's NGK's I had the same problem and found that the terminal cap screwed off. Unfortunately, the cap on these AC Delco's doesn't screw off. Am I incorrect in believing that I was able to screw them off before? If not, which plugs should I use on my '73 280c (114 chasis, 110 engine)? Please help. Thank you.

Greg

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81' 300d
73' 280c