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

wrong spark plugs

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Old Aug 21, 2010 | 11:55 AM
  #1  
M.J.L.'s Avatar
M.J.L.
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St. Jude Donor '10-'11
Default wrong spark plugs

Napa gave me spark plugs for alunimum heads on my 86 which has cast iron heads. Early 86s had cast and later 86 had aluminum. Whats the difference???
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Old Aug 21, 2010 | 12:16 PM
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The threads on the Plugs for the aluminum heads are much longer plus they have a washer instead of a taper at the top of the threads.
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Old Aug 21, 2010 | 06:34 PM
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You'll have to remember to specify you have an EARLY 86 with iron heads, usually identified by something like "86E".

When I bought my EARLY 86 many years ago, it had the wrong plugs in it, too. Had plugs for the aluminum head engine.

Jake
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