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#1
10-07-2021, 08:57 AM
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Spark Plug ??
I'm having a disagreement with a buddy.
1968 #16 heads do they use tapered or gasket type plugs? What (NGK) heat range would be best for a 9.5:1 engine. 5? 6? 7? Thanks
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No! Do not try! Do! Or do not. There is no try. - Yoda 1967 Firebird Restoration 2005 - 1/25/2017 
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#2
10-07-2021, 10:04 AM
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68 #16's will use the large 13/16 gasketed plug.
Like an R44S for example, or an Autolite 85 or NGK XR5. |
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#3
10-07-2021, 03:50 PM
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spark plugs
i have had good results with R45S plugs in my 16's. gapped at .035
Gerry
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1968 Firebird 400, 068 cam, TH400 & 13" Continental Converter, Auburn posi with 3:08 factory gears, Cliff's Q-jet resting on a 68 factory iron intake, DUI HEI and Ram Air pans and RARE Long Branch Manifolds |
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