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Can ya tell me the right plug gap for a 85 L98 engine please?? Under hood says .035 and the parts guy says .045. Need help here.

thanks .
 

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old rule of thumb is that you will gain .001'' gap every thousand miles due to erosion of the electrodes...so unless you re-gap every couple thou miles, no sense worrying 'bout 'tit.

for reduced emissions at idle, a wider gap (up to .060'') will help....under load, the tighter gap produces fewer misfires and more power.

i gap sbc plugs using the ''go-no go'' method --an .035'' wire gauge will ''go'' thru the gap, and an .040'' wire will not.

be careful that you do NOT damage the porcelain center insulator when adjusting the gap. :D
 
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