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mikajo39 · 06-28-2009, 03:26 PM

Well It depend on your Ignition Hei, spark box, points? If you have points I'd open them up to aounrd .035 with hei .045 and experiment from there. there are other factors like compression ratio and stuff when choosing plug gap size. As for cranking power your battery might be a little under powered, If you can try a buddies battery try that and see if it solves your problem. As for timing set it to where it idles good but its not so far advanced that your starter lugs real bad when your firing it up again when the engine is hot.

06-28-2009, 03:26 PM	#2
mikajo39 Gearhead and audio junkie Join Date: Aug 2008 Location: nunyah Posts: 452	Re: Spark plug gap with vortec heads/carb Well It depend on your Ignition Hei, spark box, points? If you have points I'd open them up to aounrd .035 with hei .045 and experiment from there. there are other factors like compression ratio and stuff when choosing plug gap size. As for cranking power your battery might be a little under powered, If you can try a buddies battery try that and see if it solves your problem. As for timing set it to where it idles good but its not so far advanced that your starter lugs real bad when your firing it up again when the engine is hot.