Building a new 505 With Callies / Mopar Performance Block

SMCARNUT said
I have a set of 240's here for a friends 505 street motor build and my 270's both sets are tight. Very little if any side clearance. Hopefully the shims will work if not both sets of heads will be back to the machine shop. Also, I went to the local supply house all they had was normal hex head bolts. I bought three so I could continue on my motor this weekend in case the ARP do not come in tomorrow. I did notice that the hex head bolts would interfere with the hole for the cam button.
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Correct, you'll most likely need to find Torx drive bolts that have a round head. Same kind of bolts that Jesel uses in some of their kits. Sometimes you can find an ARP bolt that will fit but usually the flange is too big. If you have a lathe you can turn down the ARP bolts to fit. We typically use a Torx head.