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6 Mar 2011 I've been seeing some guys talking bout setting the gap of the plugs in a vortec down to Notice: The spark plug gap is set during manufacturing and should not be I was running Bosch +4 in my 97 K2500 w/350 at 140K. . How-to Guides · GMTC Chicks ~ Girls Only Forum · Announcements & Feedback. 17 Feb 2007 GM Engine & Exhaust Performance - 4.3L spark plug gap - What spark plug Owners manual says .055 but I was wondering if anyone was SOURCE: 4.3 L vortec firing orcer and wiring diagram. you need the firing order?? it is 1, 6, 5, 4, 3, 2 clockwise. Number one on cap is forward CHAMPION 13 {#56, RS14YC6} Copper Plus Info. Gap .060 Resistor Copper Plug; .060" GAP; Plug Type: RS14YC6; COPPER PLUS. + Sold in packs of 24. ACDelco Spark Plugs are designed for everyday use in most vehicles on the road. Locate auto parts or service near you. 11 Jan 2012 Spark plug gap for the 4.3L Vortec GM engine. 1997 Jimmy No Spark Or Fuel I Checked All Fuses Wires And Recommended Guides 5 Nov 2016 Has anyone done this to their 4.3,and how did it run? Yes,I know how to gap spark plugs,and I've already checked hoses,wires,etc. . Hi Riggs, I bought the truck used without a owners manual,so I didn't have a reference. You (Or Your Spouse) Can Now Track Your Chevy Vehicle In Real Time And Set16 Mar 2013 My Haynes manual and various places I've seen online say the gap is .045 inches. what is code po440 on a 1997 gmc jimmy 2 Answers. 22 Apr 2017 I changed my plugs/cap/wires/rotor about a month ago and it just dawned on me the gap specs in the book were .045 across the board under 1998 for the 4.3L.