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In my effort to get the best NGK plug for my 383, I custom ordered the wrong plugs. The plugs I ordered are for a LT1 or LT4 cylinder head. Apparently these heads use a tapered. I need a flat seat with washer for my AFR heads. These plugs are not returnable since they were a custom order.
Anyone interested? The plugs are NGK Irridium's Part # TR55IX. They are BRAND NEW in the box. The plugs were $6.00 each but I'll sell them for $40 including shipping. E-mail me if interested.
I am running these plugs on my LT4 after the AC OEM platinums gave up the platinum pucks!! :eek: These plugs are great as my car felt a bit more eager to rev to 6400RPM :D