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Doesn’t NHRA still have rules for this?

Not sure when it applies haven’t had anything this slow in a long time think it might be anything quicker than 10 flat needs open lugs with 100% thread engagement
 

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Challenger SRT Hellcat 6MT
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You need at least 14 mm of thread engagement (which is about 9.5 lug nut turns) to be safe. Anything thicker than 6 mm won't give you that. If you want a thicker spacer, you need longer studs. Or you can use a special kind of lug nuts (called ET-style: google it) that will give you extra ~6 mm of thread engagement; this way you can get away with up to ~11-12 mm spacers and stock studs.
 

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Discussion Starter · #6 ·
You need at least 14 mm of thread engagement (which is about 9.5 lug nut turns) to be safe. Anything thicker than 6 mm won't give you that. If you want a thicker spacer, you need longer studs. Or you can use a special kind of lug nuts (called ET-style: google it) that will give you extra ~6 mm of thread engagement; this way you can get away with up to ~11-12 mm spacers and stock studs.
Like these?

I get over 12 turns torqued,10 turns by hand with almost 3/4” worth of spacers. Should be good then.
 

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Don't forget your rotor hat thickness lol!
 
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