Posted by papaw8 on January 08, 2021 at 10:42:15 from (75.105.14.44):
In Reply to: Spark plugs again posted by svcummins on January 07, 2021 at 18:33:59:
How much blow by does it have. If it's that gmc with the small block new valve seals might help. The drains at the ends of the heads may also be plugged with sludge. Do the rear plugs foul first? Some ford umbrella seals will fit inside the springs. I have used them with the stock o ring type also. Make sure pcv system is working and engine is reaching full temp. Splicing a large shirt button in a solid core plug wire will reduce fouling also. I have never had anti foulers on all plugs at once but would probably be ok.
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