Quote:
Originally Posted by Just Observing
I would check with tech before running those in a stock or super stock car! I have heard those are not legal. Nice but not legal.
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I agree, some years ago I brought up the subject with NHRA regarding using an adapter in a Ford FE engine to reduce the plug from 18mm/13/16" to 14mm/5/8" plug and was told Stock and Super Stock must use the OEM size spark plug designed for the specific cylinder heads.