Re: spark plugs for 1958 inline six
What engine in that truck? 235/261 or the newer 230/250/292?
I think that in the cross reference charts they give lots of alternatives to the number you put in so maybe the heat ranges aren't as accurate a cross over as they should be.
B4 rings a bell when I bought plugs for a 250. When I bought them for a 350 they were discussing Delco 44 or 45 and I can't remember which they gave me.
Last edited by vince1; 11-30-2020 at 11:13 AM.
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