yup...channel-locks wouldn't budge mine on the 87...ended up buying a 1 13/16 socket....worked great. I also used it to pull my sender out and clean the contacts so my gas gauge will work. We're not talking a huge investment here...think it cost me about $10 at northern tool.

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97 S500 (90,000 miles) - wife's car
87 300D (298,000 miles and a replacement #14 head)
94 Suburban K2500 - need something to haul firewood
83 300SD (343,000 miles) (sold)