Went to the speed shop today and finally found the exact part number for the Lightnings. They are NGK V-Power stock #4177 TR-6. Last weekend we had a debate over the washers on the NGK # R5671A-7 going into a tapered seat. The TR-6's have a tapered seat BABolt and myself put one into one of the heads he had in the box and they fit perfectly.
Not to stir any thing up. I've seen the washer plugs in action and know they will work. Just figured I'd pass this info along.

PS- Less then 1 hour to change all eight. It's alot easier with the super charger off and crew cheif Henry lending support.

HIGH RISK

 

Thanks again to you and BABOLT for checking into this, Now all I need is Henry to come to Delaware to change my plugs LOL 1 hour is incredible

Spiro

 

Highrisk,

Thanks for the part number. Greatly appreciated.

Speedin Bob