Join Date: Dec 2000
Location: Monroe, WA, USA
you got it dude..you see the plug is too short, trustme..i have 64cc vortec head's...the only dif between mine and the one's you have is the combustion chamber shap, i have a kidney shape you have a D shap if i recall. if you realy want to find out do this...take a small piece of wire and put it in the plug hole...with a flashlight count the thred's or mark the wire with the end in the head resting on the last thread,and at the edfe og the plug hole at the point where the taper seat end's. now check that agenst you plug, mesure from the face of the plug where the thred's end to the top of the sealing cone...it should be the same as the distance on the wire from the end to where you marked it, now R44 will work..but you will not get good performance out of them. good luck and post what you find! so other's can learn.