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O K, i gotta get back in here after look'n at some older posts where several guys are runnung 216 & 437 Autolites, NGK BL6's & 4's and non of them indicated any problems with pre-ign. spark knock, heating issues etc.and seem quite happy with performance.
I'm just not so concerned now...???
I sure do admire & appreciate you fella's with so much experience & knowlege though. Thanks 4 keeping guys like me advised. mike