I had to get longer Rocker studs for my #64 heads. I belive I have 9.4 or 9.5" pushrods as well. Valves are longer. Dave at SD Perf installed longer valves for greater lift. Thus requiring longer pushrods and rocker studs. ARP sells them in all sorts of lengths. I found my pushrod length using the half lift method, then seen how short my studs were. Then ordered of ARP the ones that would ensure they worked with the polylocks
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Dan Pesonen
"If it ain't broke, modify somethin till it is"
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