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alanwoodieman · 03-12-2018, 08:10 AM

if the gaps on the plugs are closing then- too long on the reach of the spark plugs--exam the sparkplug thread area- have they been counterboared? we have used double seal rings on several spark plugs used with aluminum heads to correct this reach

03-12-2018, 08:10 AM	#16
alanwoodieman Senior Member Join Date: May 2010 Location: upstate SC Posts: 2,973	Re: 221 cu in 1939 Failed No4 Piston 1 if the gaps on the plugs are closing then- too long on the reach of the spark plugs--exam the sparkplug thread area- have they been counterboared? we have used double seal rings on several spark plugs used with aluminum heads to correct this reach