Guest joe buick Posted October 14, 2011 Share Posted October 14, 2011 Hey guys, what would be a good/correct spark plug for the 300 engine with a 4 barrelThanks Joe C. Link to comment Share on other sites More sharing options...
Aaron65 Posted October 14, 2011 Share Posted October 14, 2011 AC R43S is what I'm running in mine right now, but Autolite 85 plugs are OK too... Link to comment Share on other sites More sharing options...
Guest joe buick Posted October 14, 2011 Share Posted October 14, 2011 Thanks Aaron, someone said they may be different if you have a 4 bbl Link to comment Share on other sites More sharing options...
NTX5467 Posted October 15, 2011 Share Posted October 15, 2011 In many cases back then, the 4bbl motors used a slightly colder heat range plug than did the similar 2bbl motors. Possibly just one or two "numbers" different.Several possible scenarios . . . the 2bbl motors "put-put" around more at slower speeds whereas the 4bbl motors are driven "more normally", or with even more "verve", typically.In either situation, the key thing is that the insulators stay "clean" during use in the way you're going to use the car. Only way to determine this is to put a new set of spark plugs in drive it for many thousands of miles and see if you have any problems.Just some thoughts,NTX5467 Link to comment Share on other sites More sharing options...
Aaron65 Posted October 15, 2011 Share Posted October 15, 2011 The owners manual calls for AC 44 heat range plugs for 2 and 4 barrels...but they aren't readily available anymore, which is why I'm running 43s. Link to comment Share on other sites More sharing options...
Guest joe buick Posted October 15, 2011 Share Posted October 15, 2011 Thanks guy's, just getting the motor back together and waiting for my friend to help put it in, really want to get it running befor the winter Link to comment Share on other sites More sharing options...
Guest brh Posted October 16, 2011 Share Posted October 16, 2011 In 65 the 300 came in two versions, the 4bbl with high compression that burned premium, and the 2bbl with lower compression that burned regular. The 4bbl is listed as requiring 44. 2bbl 45. This is out of my Motor's. Link to comment Share on other sites More sharing options...
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