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Discussion Starter · #1 ·
Hello, i just replaced heads on my car from stock heads with gt40 heads,60 0ver motor , new headers, h pipe, underdrive pullies it has a kenne bell twin screw supercharger, we replaced plugs, mechanic gapped them at.60 the same gap as the plugs that were in the gt 40 heads we are getting popping thru exhaust on drivers side is this timing or are plugs needeingto be re gapped possibly .45.he set timing at 10 degrees before top dead center but doesnt seem to be right havent had it on road yet.any ideas on gapping and timing, also we used same number plugs that were in gt40 heads not the ones that were in stock heads autolite 25 thanks again john
 

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Discussion Starter · #8 ·
just regapped plugs to .045 and still same thing pops at idle when you give it gas just doesnt rev up smoothly, is it possible timings of a tooth or two or out 180 degreese
 
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