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NGK for stock '66 head?
https://slantsix.org/forum/viewtopic.php?t=34928
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Author:  Red [ Sat Apr 18, 2009 12:25 pm ]
Post subject:  NGK for stock '66 head?

Everybody agree on the 2635(GR4) plug for this head?

Author:  SlantSixDan [ Sat Apr 18, 2009 2:09 pm ]
Post subject: 

Nope. One heat range too hot, and not optimal electrode design. Use ZFR5N, no metal ring washers. Tune-up parts and technique suggestions in this thread.

Author:  Red [ Sat Apr 18, 2009 6:54 pm ]
Post subject: 

Thanks, Dan.

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