Re: Stuck spark plug
The V6 used two different length plugs, if your heads required the short length thread and some one installed the long plugs 3/4" thread length and it did not interfere with the piston, the threads could be filled with carbon, which will make the plug very hard to remove. If the threads get stripped out of the head you can install a heli-coil in that cylinder with out causing any damage.
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Clyde McKaba
Abbeville,SC
1961 GMC Suburban 4WD 305 V6, 4spd
1966 GMC 3/4T P/U 351 V6, Turbo 400,Gear Vender OD
1969 GMC Suburban 1/2T
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