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

Header spark plugs - Any recomendations?

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Old Jan 22, 2019 | 01:21 PM
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Default Header spark plugs - Any recomendations?

Hi guys ,
I have a pair of Hedman headers installed on my 85 . They went in pretty well, but there in an issue with the close gap between the spark plug and the wrapped header .
Recently seen some sparks ( arcing ) between the spark plug cap and cylinder . To me , the only solution seems to be a shorter spark plug and a better insulated spark plug wire set.
I've bought a set of new wires from Zip and those aren't much improvement over the old ones I had .
Is there someone who is using such short spark plugs ?
Any recommendations ? PN# 's ?

Thanks !!!
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Old Jan 22, 2019 | 02:37 PM
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I have the Accel header spark plugs, part # 8199, in my 89 with Hedman Elite's
Also have insulating sleeve over each of the spark plug boots.
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Old Jan 22, 2019 | 03:10 PM
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Originally Posted by Mjet67
I have the Accel header spark plugs, part # 8199, in my 89 with Hedman Elite's
Also have insulating sleeve over each of the spark plug boots.
Do these Accels also work for the iron heads on my 85 ? Sorry for the dumb question ....
Seen on Summit Racing that they are listed only for 86/87.
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Old Jan 22, 2019 | 05:06 PM
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CHAMPION SPARK PLUG RV92YC 930 and https://www.ebay.com/itm/DRAG-RACE-S...d=231296580012
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Old Jan 22, 2019 | 05:12 PM
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Originally Posted by corvetteracer72
Do these Accels also work for the iron heads on my 85 ? Sorry for the dumb question ....
Seen on Summit Racing that they are listed only for 86/87.
They should work fine on your 85.
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Old Jan 22, 2019 | 05:23 PM
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I had issues with the Champion , the Accel work well.

But my 85 's engine is worked.

I also use DEI Spark Plug Boots they help.

Last edited by BLUE1972; Jan 22, 2019 at 05:23 PM.
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