What header bolts do you guys use for long tube headers?

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ARP Stainless. Length will depend on thickness of your header flanges (vary between brands)

Most SBF headers end up needing either a .750" or 1.00" header bolt, again, depending on the thickness of the flange.
 
Best would be the ARP's but i like a grade 8 allen head bolt myself...they're just as strong but you get to use an allen head to tighten them which is much easier.