C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

spark plug reach

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Old Jun 12, 2012 | 05:39 PM
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TJ-SS
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Default spark plug reach

Could anyone please tell me the correct spark plug reach for my 1986 stock aluminum head roadster? Is it .750? I know the gap is .035. I want to make sure I get the correct plugs. Thanks
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Old Jun 12, 2012 | 07:22 PM
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leesvet
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Thats an "off the rack" spark plug.....

nothing special. Use what GM calls for. AC Delco makes a helluva good plug.
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Old Jun 19, 2012 | 08:23 PM
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What do u mean "off the rack"? Is .750 correct?
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Old Jun 20, 2012 | 06:56 AM
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Originally Posted by TJ-SS
What do u mean "off the rack"? Is .750 correct?
TJ, he means "off the shelf, always in stock, what trhe doctor ordered."
the specified plug, per parts books. mine is alum hd 91, .750, not sure about other heads.
if you simply want the correct plug, order the AC that your user manual calls for and forget about the reach. or order whatever the auto store specifies. the reach will be correct if engine has stock heads, right?
joe
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