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Old 09-09-2010, 07:09 PM
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1985 Corvette Plug Gap

Hi, looking for someone that would know the spark plug gap on a 1985 corvette with a 350 tpi Motor. Thanks.

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Old 09-09-2010, 10:17 PM
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My brother has a 85, we gapped them to .045. You could gap them from .025 to .060 and not be able to tell the difference.
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Old 09-10-2010, 01:40 AM
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Is the emissions tag missing under the hood? It should be posted there with specific info about the engine actually installed on the production line (in case there was some short term change WRT to what was installed).

Otherwise, as far as I know, all the 350 TPI engines were spec'ed with a .035" gap. Typically with a strong ignition you can get away with a larger gap and you may get a slight increase in mpg, but it will take more power to fire the plug so typically you'll start to see it dropping spark at higher rpms.
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