Codi's right, use flat washers. Per head, the two outside holes are blind. The four inner holes need sealing. Clean threads and bolts with Brakleen so sealer will stick.
Also, the reason flat washers are needed is because if the bolt is too long, then the bolts will rub against a couple pushrods, creating a screech, like fingernails on a blackboard.
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CUBS - 2016 World Series Champions - Thank you, Joe Madden … enjoy your next chapter.