I guess I should describe it more as a tapping. What causes a plug to go black?.....and only one plug. I checked the pushrods and they look fine. I cranked the motor over with the valve covers off and all the rockers went up and down.
I had 92 octane with 104 octane boost with timing at 16*
I put new plugs in and am waiting for the delivery man to bring my intake gasket...he should be here today. When I took off my upper intake the gasket was in two pieces.
Anyhow, if anyone has some info... 
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91 LX - 10.5:1 pistons, ported 289 heads, Ultradyne 588 cam, Cobra upper/lower, MSD, JBA long tube headers, Flowmaster, Richmond 4:10, roll cage, monster tach...FUN!!
95 SHO - K&N filter
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